Document text
An Bor -15
INSTRUCTION
MANUAL
REGULATED POWER SUPPLIES
| MODELS LH 128A, LH128A-FM, LH128A-S
MODELS LH 128, LH 128FM, LH 1285
BEARING SERIAL NO.
PREFIXES A-C |
_ AR
LAMBDA ELECTRONICS CORP.-MELVILLE, Li І., М. Y.
шы»
INSTRUCTION MANUAL
FOR
REGULATED POWER SUPPLIES
MODELS LH 128A, LH128A-FM, LH128A-S
MODELS LH 128, LH 128FM, LH 1288
BEARING SERIAL NO.
PREFIXES A-C
manual provides instructions intended for the
operation of Lambda power supplies, and is not to
be reproduced without the written consent of Lambda
ВЕС Corp, - All information contained herein
applies to metered, non-metered, and chassis-mount-
ШЕ models unless otherwise specified.
LAMBDA ELECTRONICS CORP. ШАЛТ, L. Lo
11.
MAIN PLANT TELEPHONE: 516 MYrtle 4-4200
IM LH 128
TABLE OF CONTENTS
SECTION
SPECIFICATIONS AND FEATURES
MOUNTING
THEORY OF OPERATION
GENERAL
FUNCTIONAL DESCRIPTION
OPERATING INSTRUCTIONS
CONTROLS, INSTRUMENTS AND FUSES
GROUND CONNECTIONS
BASIC MODES OF OPERATION
SUPPLY-LOAD CONNECTIONS
DETAILED OPERATING PROCEDURES
OPERATION AFTER PROTECTIVE DEVICE SHUTDOWN
MAINTENANCE
GENERAL
TROUBLE ANALYSIS
CHECKING TRANSISTORS AND CAPACITORS
PRINTED CIRCUIT BOARD MAINTENANCE TECHNIQUES
TROUBLE CHART
ADJUSTMENT OF CALIBRATION CONTROLS
PERFORMANCE CHECKS
SERVICE
PARTS ORDERING
PARTS LIST
USE OF RACK ADAPTERS (FIG. 18)
INSTALLATION OF 1/2 RACK UNITS INTO LRA-1 ult 18)
T
SHIPMENT OF UNITS MOUNTED IN LRA-1 (FIG.
USING BLANK PANELS AND BLANK CHASSIS (FIG. 18)
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SPECIFICATIONS AND FEATURES
Specifications apply for the non-metered LH 128, metered LH 128FM
and chassis-mounting LH 128S models.
DC OUTPUT--Voltage regulated for line and load
voltage hanee LI... eere... 0-60 volts DC
liar s Current Ranges......... Current range must be chosen to suit
the appropriate maximum ambient temp-
erature. Current ratings apply for
entire voltage range
Ambient Temperature......30°C 50°C 60% ALAS
Current Е. SM 0-21٨ ОА O-1.5A
REGULATED VOLTAGE OUTPUT
Шо Япе).............ІТевв than 0.015 percent or 1.0 milli-
volt, whichever is greater for input
variations from 105-135 or 135-105
volts AC
Regulation AO همو we LOSS than 0.015 percent or 1.0 milli-
volt, whichever is greater for load
variations from О to full Тода OF full
0930 to O
Transient в ............ 2 Output voltage is constant within reg-
(line ) ulation specifications for any 15-volt
line voltage change within 105-135
volts AC
Ent Песропве............Олірав voltage is constant within 50
(load) millivolts for load changes full load
to O, within 50 microseconds after
appdieation;-is constant within 14 milli-
volts for load changes from O to full
load within 50 microseconds after appli-
cation and is constant within 10 milli-
volts for load changes full load to 10%
of load within 120 microseconds after
application
Remote Programming Constant...200 ohms/volt output
Internal Impedanee............Less than ОРЕ DO Бо 1 kiloz
cycle
LH 128 Page 1
Kipplerand- Noise, SO ISENE Less than 250 microvolts ШӘ
millivolt peak to peak with either
positive or negative terminal grounded
Temperature, Coefficient 2527) Output change in voltage less than
0.015%/°C
DC_OUTPUT--Current regulated for line and load; Automatic Crossover
MTS with voltage limit
Multi =Current Ranges e Current range must be chosen to suit
the appropriate maximum ambient temp-
erature. Current ratings 201 or
entire voltage range
Ambient Temperature... 300 50°C 60°C EC
Current Range VP 0.48-2.4А 0.48-2 ЛА 0.48-1 САИ ЕА
Voltage Rangel 2. ие 0-60 volts DC, for entire current
range
REGULATED CURRENT OUTPUT; AUTOMATIC CROSSOVER
Regulation (Line lb pe as: Less than 15 milliamperes Tor ٢٢ | ٢
variations from 105-135 а
volts AC
Regulation (load).............less than 15 milliamperes E
voltage changes from O to 60 or 60
to O volts DC
Ripple and Noise... i. N ee Less than 1 ma at 55-480 eps;
Less than 3 ma at 45-55 eps; both with
either neg. or pos. terminal grounded |
DC OUTPUT--Current regulated for line and load; Barrier strip recon-
ANS nection for Precision Current Regu-
lated Output with no voltage limiting
Multi-Current Ranges....... ...Current range must be chosen bot
the appropriate maximum ambient temp-
erature. Current ratings apply for
entire voltage range
Ambient Temperature... 3058 r Ub GORG TEC
Current Rance an 0.12-2.4А 0,105-2.1A 0.09-1 -321 а
voltage Range oe. ens Jam pipe HAT 0-60 volts DC, for entire current range
Page 2 LH 128
REGULATED CURRENT OUTPUT; PRECISION CURRENT REGULATED
Re mac ion (line)...... Ben 0.052 or 0.5 milliampere,
whichever is greater, for input vari-
ӘЛ ШОП Of 105—135 or 135-105) volts АС
Regulation (toad), A CA +... «| Less than 0.05% or 0.5 milliampere,
whichever is greater, for load changes
from 0-60 or 60-0 volts DC
Es: odNoise......... eco Less than O.5 ma at 55-480 eps;
Less than 1.0 ms at 45-55 eps; both
wichr either neg. or ров. terminal
grounded
Remote Programming...... ЛК. 100 ohms, 2-watt resistance for maxi-
mum rated current; adjustable over
range by decreasing resistance
AC IUUD. 205-135 omn 205-265 ( opt ton) volts АС at 45-480 cps;
290 watts*
ПН output loaded to full 30°C rating and input voltage
Mo volts AC
OVERLOAD PROTECTION
dO] 295.55 РОНА Thermostat, resets automatically when
over-temperature condition is elimin-
ated
Electrical
See еее وود ده Adjustable, automatic, electronic
eurrent-liniting circuit, settable
to 105 percent of rated current;
Limits output, current to preset limit
for protection of load and power
Supply when external overloads and
direct Shorts occur
Tumi e ea l зан. HN UE Puse provides protection against in-
zernal CTACTA T fallure
INPUT AND OUTPUT CONNECTIONS--Heavy duty terminal block on rear of
chassis with 5-foot, 3-wire detachable
ine cord tor all models; Dive-way
banding posts provide for additional
positive (+), ground, and negative (-
DC output connections on front panel
of FM models
LH 128 Page 3
‘OPERATING AMBIENT TEMPERATURE RANGE AND DUTY CYCLE--Continuous duty
from 0°C to 71°C ambient with corres-
ponding load current ratings for all
modes of operation
STORAGE TEMPERATURE-- 2550 bombo О
(non-operating )
METERS--Voltmeter and ammeter on metered (FM) models
CONTROLS
DC output controls: ED Coarse and fine voltage controls and
current control permit adjustment of
DC output; located on front panel of
all models
Test Jacks (+) (-)...Test jacks for non-metered model permit check-
ing DC output with external meters
Remote Sensing.......Provision is made for remote sensing to elimi-
nate effect of power output lead resistance on
DC regulation
Dower sn ol Um MINUM ....Panel mounted switch and indicator light for all
units except models with suffix (S)
hb S HU Ma. Digs eer ha 5-3/16"H x 8-3/8"W x 15-5/8"D (LH 128, ВВ
4-5/]16"H x SW x 15-57 МВ 1995)
We LON ое ТАТҮ: Л С 25 lbs. nets. 30 lbs. sipping wv.
Panel, Paves در Brushed aluminum clear anodized panels with grey
inlay (standard); special finishes available to
customer's specifications at moderate surcharge
MOUNTING:
Laboratory beneh, table top...LH 128, LH 128FM
CHASSIS MOURA GE Е LH 12885
NOTE: Bumpers secured to the base of LH 1285 units permit
circulation of air through the unit. Do not remove bumpers
unless the chassis-mounting is provided with a cutout to
permit free-flow of air through the unit.
Standard TO reacio rl D LH 128, LH 128FM; used with rack adapt-
ers: LRA-1 (slide accomodation provided
LRA-2 (conventional mount)
See figure 18.
Page 4 LH 128
ACCESSORIES
КООШО ес ... Rack adapter LRA-1 used for ruggedized mounting,
wich Or without chassis slides is available, as well as rack
adapter LRA-2 which is used for simple rack installations where
chassis slides are not required.
Overvoltage Protector ... Externally mounted, Overvoltage Protector
LH-OV-6, is available.
MODEL OPTIONS
Suffix "R" Fungus Proofing Option ... Standard LH power supplies
сап Бе Obtained with fungus proofing treatment with MIL V 173
1 17 Тот all fungi nutrient components.
١ ھت Input Option ... Standard LH power supplies are avail-
able for operation with 205-265 volt, 45-480 cps input.
LH 128 Page 4a
THEORY OF OPERATION
GENERAL
Ша Тапрдаа power supply circuitry consists of an AC input circuit
s upero, a reference supply circuit consisting of an auxil-
lary rectifier and filter, zener diode pre-regulator, reference ele-
LER regulator; a main regulator circuit consisting of the
main rectifier and filter, a series regulator, two emitter follower
(РЕТТЕ current limit amplifier, a voltage amplifier, the comple-
mentary differential amplifier circuit, and an output sensing circuit.
The circuit arrangement is shown in block diagram form in figure 14.
The circuitry is discussed with reference to the block diagram and the
Schematic diagram.
FUNCTIONAL DESCRIPTION
single phase input power is applied to transformer T1 through the
input circuit containing thermostat S2 and fuse Fl, which protect the
Supply against overheating and internal faults.
The main rectifier, a full-wave bridge rectifier, comprised of diodes,
СВ14-17, provides the power which is filtered by capacitor C12 and then
regulated via a series regulator and delivered to the output. The full-
wave auxiliary rectifier CR10 and CR11, provides voltage filtered by
capacitor C8 for reference series regulator Q6 and reference element Q5
of the reference supply as well аз for pre-regulator CRS and CRI. The
reference supply output provides a regulated, temperature compensated
reference voltage which is used to determine the output voltage of the
unit. Cascade connected pre-regulator CR8, CRY, R24 and R23, provides
Stabilized bias voltage for current limit amplifier Q4, voltage ampli-
fier Q3, "OR" gate CR4 and CR3, and for complementary differential
amplifier Ql and Q2.
Reference element Q5 contains a zener diode and transistor in one
unit which act to reduce the effect of temperature changes and to pro-
vide a stable reference voltage for series regulator Q6.
Constant voltage or constant current crossover circuit operation is
determined by changes in the load. A change in the load is sensed by
sensing divider R5, ВД, CR2 and RIA, B, which has a fixed current flow-
ing in the divider elements as determined by the setting of calibration
FI oj This variation causes a change to 01 input of the comple-
mentary differential amplifier, which compares it with the reference
voltage through the sensing divider, causing an error signal at the out-
put of Q2. Simultaneously current limit amplifier Q4 samples the load
current through current sensing resistor R43. When the current reaches
a preset limit, Q4 will generate an error signal.
ИШИ 128 | Page 5
The error outputs from Q2 and Q4 are fed through "OR" gate CR3,
CR4 to voltage amplifier Q3, and one signal is amplified by Q3 and
emitter followers Q8 and Q9. The amplified signal from the emitter
followers determines the impedance value of series regulator Q10-
Q15 which acts as a varying impedance in series with the output.
These power transistors function as the active series regulating
element.
Under constant voltage operation Q4 is in saturation, CR3 conducts
and СЕД in the "OR" gate is turned off, and all of the сике 2.049
flows through Q4. When load current increases, the voltage drop
across current sensing resistor R43 increases, biasing Q4 toward cut
off. When Q4 cuts off, CR4 is forward biased and conducts while CR3
ceases to conduct. The signal is amplified via voltage amplifier Q3
and emitter followers Q8 and Q9, increasing the impedance of series
regulator Q10-Q15, causing the output voltage to decrease toward zero
and the unit to function at the fixed current limit.
Voltage amplifier Q3 operates at all times from the output of "OR"
gate CR3, CR4, its action depending upon which signal the "OR" gate
conducts. When Q4 is turned off due to an excessive load, Q3 will
saturate, causing main series regulator Q10-Q15 to turn off. When
load current limit is not reached or exceeded, Q4 is in saturation
and Q3 will operate with the error signal derived from Q2 of the
complementary differential amplifier, causing the series regulator
to echange the output voltage for the preset voltage limit.
When connected for precision current operation, the complementary
differential amplifier is referenced to, the current sensing resistor,
with a fixed current flowing from the sensing divider through poten-
tiometer RIA, B. Any change in load will cause an error ЕЛЕ
the complementary differential amplifier and the circuit funetions as
explained previously.
Page 6 LH 128
OPERATING INSTRUCTIONS
CONTROLS, INSTRUMENTS AND FUSES
POWER ON Switch, The POWER ON switch, located on the front panel,
controls application of input power to the supply. When the switch
Eu position, the red POWER ON indicator glows.
В СЕ Control, The OUTPUT VOLTAGE control is a dual con-
ED unge of a coarse adjustment potentiometer, which varies
the DC voltage over a range of 0-59 volts and a fine adjustment po-
tentiometer, which varies the DC voltage over a one-volt range.
Clockwise rotation results in increasing voltage. The total DC volt-
АО voltage regulated operation, is equal to the sum of
А СЫ те; for current regulated operation the maximum volt-
Ep. usual. со the sum of each shaft setting. The control is
Е бое front panel of all units.
CURRENT LIMITER Control. This potentiometer varies the maximum DC
Current over the rated *current range and, for current or voltage
ВЕ Ой, limits the DC current output to the setting on
the control. Clockwise rotation results in increasing current. This
aOR po located on the front panel.
*Operation for output current below rated limits can result
output or no regulation.
Output Voltage Meter. A O-60 volt DC voltmeter monitors the voltage
at the output terminals of metered (FM) units.
Output Current Meter, А 0-1.0 ampere DC ammeter monitors the load out-
put current of metered (FM) units.
Buse. Fuse Fl, internally located, is a 3 ampere, ЗАС "SLO-BLO" fuse
совой = in the AC input circuit.
Connection Terminals. Make all connections to the supply at the ter-
minal block on the rear of the supply. On FM suffixed models, DC out-
put connections can also be made at the five-way binding posts located
on the front panel. Apply input power through the line cord or dir-
ectly to terminals 1 and 2 if the line cord is removed. Always connect
the ungrounded (hot) power lead to terminal 1.
The supply positive terminal is brought out to terminal 6. The sup-
ply negative terminal is brought out to terminal 4.. Recommended.
wiring of the power supply to the load and selection of wiring is
shown in figures 1 through 13. Selection of proper wiring is made on
the basis of load requirements. Make all performance cheeks and
measurements of current or voltage at the rear output terminals. Con-
nect measuring devices directly to terminals or use the shortest leads
possible.
Page 7
LH 128 s
GROUND CONNECTIONS
The Lambda power supply can be operated either with negative or posi-
tive output terminal grounded or with no terminal grounded. Both posi-
tive and negative ground connections are shown in the diagrams for all
suggested output connections illustrated in this manual.
NOTE: When operating the supply with neither term-
inal grounded, high impedance leakage resistance
and capacitance paths can exist between the power
Supply circuitry and chassis ground.
BASIC MODES OF OPERATION
This power supply is designed to operate as a constant voltage source
or as a constant current source. Except when used for a precision con-
stant current source, automatic crossover to either mode of operation
occurs when load conditions change as follows:
Constant Voltage. The power supply will function as a constant voltage
source while the load current does not equal the current value 5-57
set by the CURRENT LIMITER control. When load current Ip, = М = ILIM>
hr,
the supply will cross over automatically and will operate as a constant
current source, Further decrease in value of load resistance SUS
in decrease of voltage across the load while current remains regulated
to IpIM.
Constant Current (Automatic Crossover), The power supply will function
аз a constant current source while the load voltage Ут, does not equal
the voltage value set by the OUTPUT VOLTAGE control. When load voltage
VL equals the value set by the OUTPUT VOLTAGE control, the suppl LL
automatically cross over and operate as a constant voltage source.
Constant Current (Precision), The power supply will function within
rated specifications as a conventional constant current source without
automatic crossover. When load voltage demand exceeds the rated volt-
age of the power supply, the unit output current regulation wilt not
be within specification.
SUPPLY-LOAD CONNECTIONS
NOTE: Refer to DETAILED OPERATING PROCEDURES for
step-by-step instructions for operation of power
supply.
Page 8 LH 128
CONNECTIONS FOR OPERATION AS A CONSTANT VOLTAGE SOURCE
The output impedance, regulation, and transient response of the
power supply at the load may change when using the supply as a con-
Stance voltage source and connecting leads of practical length are
used. To minimize the effect of the output leads on these character-
istics, remote sensing is used. Recommended types of supply load
ponneetions with local or remote sensing are described in the follow-
ing paragraphs.
11 Nu 1۱71768 1 and 2 to determine voltage drop for particular
cable length, wire size and current conditions. Lead lengths must be
measured from supply terminals to load terminals as shown in figure 3.
Two-Wire Connection, Figure 4, The two-wire connection, with local
Sensing, is the connection suitable for application with relatively
constant load where extremely close load regulation and fast transient
ESpDonse over Tull-rated current excursion are not required at the load.
Improved Two-Wire Connection, Figure 5. The improved two-wire connec-
ШОП, Weed local sensing, is suitable for applications where excess-
ively 1002 connecting leads are not used. Using multiple paralleled
leads in this type of connection reduces the supply-load lead voltage
drop and permits improved regulation and transient response.
Four-Wire Connection, Figure 6. The four-wire connection with remote
sensing, provides complete compensation for the. DC voltage drops in
те ٢71717 Me cables. Compensation for lead drop is also valid for
gradual changes of load current.
Programmed Voltage Connections, Using External Resistor, Figure 7. Dis-
cr Cod; s steps сап be programmed with a resistance voltage divider
valued at 200 ohms/volt output and a shorting-type switch as shown in
БОЕО When continuous voltage variations are required, use vari-
able resistor with the same 200 ohms/volt ratio in place of the resis-
tive voltage divider and shorting-type switch. Use a low temperature
coefficient resistor to assure most stable operation.
As Shown in figure 7, voltages can be programmed utilizing either
шалар remove sensing connections, as desired.
Programmed Voltage Connections Using Programming Voltage, Figure So ine
power supply voltage output can be programmed with an externally con-
nected programming power supply. 4
Тһе output voltage of the programmed supply will maintain а one-to-one
ratio with the voltage of the programming supply.
CONNECTIONS FOR OPERATION AS A CONSTANT CURRENT SOURCE
Automatic Crossover Constant Current Connections, Figure 4, Figure 4
Shows the connections which are used when operating the power supply as
a constant current source with automatic crossover, using local setting
or current eöntrol.*
*Setting control, for output currents below rated limits can
result in no output or no regulation.
ИН 128 Page 9
In this mode of operation, when the load voltage increases, due to
changing load resistance, to the limit of the OUTPUT УО conte
setting, the power supply crossover circuit will cause ٢ ٢ ٢ ٢ vo |
operate as а constant voltage supply. |
|
Precision Regulated Constant Current Connections, Figure 9. Figure 9 |
Shows the connections which are used when operating the power supply |
as a precision constant current source, using local settene
control“
In this mode of operation, the power supply functions аб 8 сопчуейе
tional constant current supply with crossover circuit 1 те
The load voltage limit is fixed to the maximum voltage rating of the
power supply.
Programmed Precision Regulated Current Connections, Figure 10. To pro
vide discrete current steps from 5% to 100% of rated current, use any
combination of separate 2-watt resistors totalling 100 ohms together
with а shorting-type switch connected as shown in figure 10. Use re-
sistors with low temperature coefficients to assure most stable operas
TONI
When continuous current variations are required, use а 150 опт, 2-wa
variable resistor in place of the separate resistors) апа sern та
switch,
CONNECTIONS FOR SERIES OPERATION
The voltage capability of LH power supplies can be extended by serie
operation of two LH power supplies of equal* voltage тасш А maxdc
mum of 200 volts can be connected between either the +DC or -DC term-
inal and chassis ground. |
*For applications using supplies of unequal ratings, con-
sult factory for details of operagion,.
The two units are shown connected for series operation aure:
11 and 12. Figure 11 shows the series connection dir
be suitable for use in all applications where exact one-to-one voltage
tracking of the "master" (M) unit by the "slave" ($) در ce
quired. The slight offset in tracking 18 easily compensar by
adjusting the, OUTPUT VOLTAGE controls 60 the (SS) "unite
Figure 12 shows the series connection diagram suitable Тор аррі1са-%
tions where exact one-to-one voltage tracking is required. In this
series configuration, resistor RBAL permits the (S) unit 50 track the
(M) unit on an exact one-to-one basis, thereby eliminating the possi-
bility of an offset voltage existing between the two units
Resistor Rpar, should be a one-watt, 10-20 kilohm resistor. This val
would permit wide-range compensation for manufacturing differences in-
herent in the components used in each unit. Resistors RS and Ry func
in the voltage sensing circuits of both units, enabling the (S) unit ti
reference its output voltage to that of the (M) unit. In figure 11, R
performs a similar function. Capacitor Cs, used to eliminate stray AM
pickup, Le, rated.aule. HNE EO NV
Page 10 LH 128
For either series mode of operation, select RS and RM on the basis
ВА OMS per volt of (My mit 5 voltage. Re must equal RM.
Diodes CRM and Cha, which protect the units against reverse voltage,
must be capable of withstanding the maximum rated current of the (M
DEL.
F or 11577: permit operation for either constant voltage or con-
Е ое with automatic crossover to either mode of operation
иси ПС respective limiting operating current or voltage is
В Уон in figures 11 and 12, each method permits connec-
ШОП tor either local or remote sensing.
CONNECTIONS FOR PARALLEL OPERATION
B Xr Ее 0022111577 of LH power supplies can be extended by para-
ЖЕСІ Operacion of two LH power supplies of equal* voltage capacities.
E woes are shown connected for parallel operation in figure 13.
One power supply designated the "master" or (M) unit controls its own
NN the output of the second power supply, designated the
"siave oor) (Ss) unit.
Dx ons using supplies of unequal voltage
px consult factory for details of operation.
"11010 es to regulate its current in a ratio to that of the
(M) Ux ring the current in its internal sampling resistor
о НОС sampled by the master internal sampling resistor.
When power supplies of unequal current capacities are parallel connected
Pie Om ton or current supplied will be approximately equal to the
Ao -cubpPent ratings of the supplies.
Parallel connected units can be operated for constant voltage with
ЕЕ well as for constant current with automatic crossover.
When operating for constant voltage, the (M) unit can automatically
ВЕ О constant current operation.
DETATLED OPERATING PROCEDURES
SAFETY NOTTCE
DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT, OBSERVE
THE USUAL SAFETY PRECAUTIONS WHEN OPERATING OR SER-
VICING THE EQUIPMENT TO AVOID SHOCK OR INJURY,
CONSTANT VOLTAGE OPERATION, ADJUSTABLE CURRENT LIMIT
1. Remove AC power input to the supply and place POWER ON
switeh in OFF position before connecting load to the supply.
LH 128 Page il
2. Determine load requirements, select wire Гром 1 ګل
1-3 and choose desired type of supply-load connection from figures
4-6,
3. Connect supply to load as shown on the selected con-
nection diagram.
NOTE: When shipped from the factory, the supply
is ready for use as a constant current source with
automatic crossover or as a local-sensing constant
voltage source. Jumpers are connected at the fac-
tory as shown in figure 4. Take care to remove the
appropriate jumpers for load requirements that need
different supply-load connections. Refer to the
appropriate connection diagram.
4, Turn OUTPUT VOLTAGE control knobs to the qes u QR s
age setting.
5. When current to the load must be limited to an inter-
mediate value within the current rating of the supply, turn the CUR-
RENT LIMITER control to the desired current limit setting. If no
intermediate current limit is required, turn the control CW to The
position for full current rating for the maximum ambient temperature
of operation. Refer to section on specifications.
6. Apply AC power to the supply.
7. Place POWER ON-OFF switch in ON position and check that
red POWER ON indicator is lit.
8. Check that output current and output voltage meters in-
dicate desired values; as required, adjust OUTPUT VOLTAGE control knobs
and CURRENT LIMITER control to obtain correct meter indications. For
non-metered models use externally connected meters and check that cor-
rect meter indications exist at output terminals 6 and 4, or at front
panel test jacks (+) and (-); for remote sensing connections, check at
the load terminations of sensing leads on terminals 3 and T.
9. Power supply is now in proper operation.
PROGRAMMED CONSTANT VOLTAGE OPERATION, ADJUSTABLE CURRENT LIMIT
1. Remove AC power input to the supply and place POWER ON
switch in OFF position before connecting load to the supply.
2. Determine load requirements, select wire size 217 لل ٢٢٢
from figures 1, 2 and 3 and choose desired type of supply-load con-
nection from figures T or 8. Refer to paragraph on Programmed Voltage
Connections.
Page 12 LH 128
3. Connect supply to load as shown on the selected connec-
Бара. As shown in figure 7, take care to use a shorting-type
Switch for the external programming control when several voltages are
desired and the programming voltage method is not used.
4, Turn OUTPUT VOLTAGE control knobs to the extreme CCW
position. Adjust external programming voltage control to desired
voltage setting.
5. When current to the load must be limited to an intermed-
late value within the current rating of the supply, turn the CURRENT
LIMITER knob to the desired current limit setting. If no intermediate
егеп limi o is desired, turn the control CW to the position for full
rated current for the ambient temperature of operation. Refer to sec-
tion on specifications.
6. Apply AC power to the supply.
7. Place POWER ON switch in ON position and check that red
Bowen ON 71102601 is lit.
6, Check that output current and output voltage meters in-
G@icate desired values; as required, adjust CURRENT LIMITER knob and
external programming voltage control to obtain correct meter indica-
tions. For non-metered models use externally connected meters and
check that correct meter indications exist at output terminals 4 and
6, or at front panel test jacks (+) and (-); for remote sensing con-
nections check at the load terminations of sensing leads on terminals
Sand Te
9, Power supply is now operating properly.
CONSTANT CURRENT OPERATION WITH CROSSOVER, ADJUSTABLE VOLTAGE LIMIT
1. Remove AC power input to the supply and place POWER ON
See Chee Mu nPosTolon before connecting load to the supply.
2. Determine load requirements and connect load to the
supply as shown in figure 4
ага the CURRENT LIMITER knob to the desired current
setting.
4. When load voltage must be limited to an intermediate value
шешіп ле voltage rating of the supply, turn OUTPUT VOLTAGE control
knobs to the desired voltage limit setting. If no intermediate voltage
ИІП raving of supply 18 desired, turn controls to the full
CW pOsivszon to obtain voltage limit at maximum voltage rating of the
supply.
5. Apply AC power to the supply.
6. Place POWER ON switch in ON position and check that red
POWER ON indicator is lit.
LH 128 Page 13
7. Check that output current and output voltage meters
indicate desired values; adjust OUTPUT VOLTAGE control knobs and
CURRENT LIMITER control as required to obtain correct indications.
For non-metered models use externally connected meters and check
that correct meter indications exist at output terminals 4 and 6,
or at front panel test jacks (+) and (-).
8. Power supply is now in proper operation.
PRECISION REGULATED CONSTANT CURRENT OPERATION
1. Remove AC power input to the supply and place POWER
ON switch in OFF position before connecting load to the supply.
2. Determine load requirements and connect load to the
Supply as shown in figure 9.
3. Turn the CURRENT LIMITER knob to the maximum desired
current setting.
4. Turn both OUTPUT VOLTAGE control knobs to extreme CCW
position.
5. Apply AC power to the supply. Place POWER ON switch
in ON position and check that red POWER ON indicator is lit.
6. Turn fine OUTPUT VOLTAGE control knob CW until the de-
sired current setting as indicated by output current meter is reached.
7. Check that output current\meter indicates desired value
and that output voltage meter does not indicate OFF scale. Adjust
fine OUTPUT VOLTAGE control knob as required, to obtain correct in-
dication. For non-metered models use extremely connected meters and
check that correct meter indications exist at output terminals 4 and 9.
8. Power supply is now in proper operation.
PROGRAMMED PRECISION REGULATED CONSTANT CURRENT OPERATION
1. Remove AC power input to the supply and place the POWER
ON switch in OFF position before connecting load to the supply:
2. Determine load requirements. Connect load to the supply
as shown in figure 10. Refer to paragraph on Programmed Current Con-
nections.
3. Turn the CURRENT LIMITER knob to the maximum desired set-
ting. .
4. Turn OUTPUT VOLTAGE control knobs to extreme CCW position.
5. Apply AC power to the supply. Place POWER ON switch in |
ON position and check that red POWER ON indicator is lit. 7
6. Turn fine OUTPUT VOLTAGE control knob CW until the desired
current setting is reached, as indicated by output current meter.
Page 14 | LH 128
Т. Check that output current meter indicates desired
Value and that output voltage meter does not indicate OFF scale.
ШЕ -геййігей, adjust external current programming control to ob-
tain correct indication. For non-metered models use externally
connected meters and check that correct meter indications exist
ЕЕ output terminals 4 and о.
8. Power supply is now in proper operation.
SERIES CONNECTION CONSTANT VOLTAGE OPERATION, WITH CURRENT LIMIT
AC power input to the "slave" (8) and "master" 10975 رل
(M) units and place POWER ON switches in OFF position before con-
пессіпе load to the supplies.
E с ле load requirements, select wire size from fig-
ures 1-3 and choose correct type of series supply-load connections
шоп ав ll ао 12. Refer to paragraph on CONNECTIONS FOR SER-
IES OPERATION.
3. Connect supply to load as shown on the selected connec-
Eme required, select resistors Rpır, Rs and Rm, and
diodes CRS and CRM in accordance with instructions contained in CON-
NECTIONS FOR SERIES OPERATION.
4, Turn (M) unit OUTPUT VOLTAGE control knobs to the de-
Sired voltage setting. This setting will be approximately one-half
ӨР ene COMME (M) and (S) unit output voltage.
Б, Turn (S) unit OUTPUT VOLTAGE control knobs and CURRENT
LIMITER control to extreme CW position.
6. When current to the load must be limited to an intermed-
late value within current rating of the unit with lower current cap-
acity (M unit) turn the (M) unit CURRENT LIMITER control to the desired
n c sc mbeprmediate current limit is required, turn the con-
Urol CW bo che position for full current rating for the maximum am-
bient temperature of operation. Refer to section on specifications.
Hohen units of equal current rating are series
connected, the (M) unit CURRENT LIMITER control must
Beer ас å position slightly less than that of the
W unit.
Tf. Apply AC power to the supplies.
8. Place POWER ON switches of both units in ON position and
check that red POWER ON indicators are lit.
A LH 128 Page. 15
9. Check that output current and output voltage meters
indicate desired values; total voltage is equal to sum of (S) and
(M) units. As required, adjust OUTPUT VOLTAGE control knobs and
CURRENT LIMITER control of (M) unit to obtain correct indications.
For non-metered models use externally connected meters and check
that correct meter indications exist at output terminals of the (S)
and (M) units; positive (+) terminal of (M) unit and minus (-) term-
inal of the (S) unit are the output terminals of the series combina-
tion.
Use front panel jacks (+) of (M) unit and (-) of (S) unit to make
current and voltage cheeks for the appropriate units. For remote
sensing connection, make cheeks at the load terminations of sensing
leads from terminals 7 of (M) unit and from Rg connection of ME) uniti
10. Power supplies are now in proper operation.
SERIES CONNECTION CONSTANT CURRENT OPERATION, WITH VOLTAGE LIMIT
1. Remove AC power input to the (S) and (M) units and place
POWER ON switches in OFF position before connecting load to the sup-
рее.
2. Determine load requirements, select wire size arom res
ures 1-3 and choose correct type of series supply-load connections
from figures 11 and 12. Refer to paragraph on Connections Төр срез
Operation.
3. Connect supply to load as shown on the selected connec-
tion diagram. As required, select resistors hpap, RS se
diodes CRs and CRM as instructed in Connections for Series Operation
paragraph.
4, Turn (M) unit CURRENT LIMITER control to the desired set-
ting.
NOTE: When units of equal current rating are series
connected, the (M) unit CURRENT LIMITER control must
be set at a position slightly less than that of the
(Spa xui b.
5. Turn (S) unit OUTPUT VOLTAGE control knobs and CURRENT
LIMITER control to extreme CW position.
6. When load voltage must be limited to an intermediate
value within the voltage rating of the series combination, turn the
(M) unit OUTPUT VOLTAGE control knobs to a position approximately
one-half the total voltage rating for the combination.
If no intermediate voltage limit is required, turn the contralto
the full CW position to obtain voltage limit at the maximum combined
ratings of the supplies.
Т. Apply AC power to the supplies.
Page 16 LH 128
8. Place POWER ON switches of both units to ON position and
check that red POWER ON indicators are lit.
ol that output current and output voltage meters indi- یر
cate desired values; total voltage is the sum of (S) and (M) unit volt-
Em s КОСЫ тей, adjust OUTPUT VOLTAGE control knobs and CURRENT
LIMITER control of (M) unit to obtain correct indications. For non-
metered models, use externally connected meters and check that correct
meter indications exist at output terminals of the (S) and (M) units;
positive (+) terminal of (M) unit and minus (-) terminal of the (S)
nit are the output terminals of the series combination.
Use front panel jacks (+) of (M) unit and (-) of (S) unit to make
Gurrenv and voltage checks for the appropriate units. For remote sens-
ШІР connections make checks at the load terminations of sensing leads
from terminal 7 of (M) unit and from Rev connection of (8) unit,
TO, Power supplies are now in proper operation.
PARALLEL CONNECTION CONSTANT VOLTAGE OPERATION, WITH CURRENT LIMIT
1, Remove AC power input to each supply and place POWER ON
switch on both (M) and (S) units in OFF position before connecting
load! to the supplies.
Determine load requirements, select wire size from fig-
Dres He manual. Refer to paragraph on Connections for Para-
llel Operation.
FS Гесс Supplies to load as shown in connection diagram,
figure 155
NOTE: When shipped from the factory, each supply
Е Tor use as a constant current source or
о 1-sensing constant voltage source. Jumpers
are connected at the factory. Take care to remove
the appropriate jumpers for load requirements that
need different supply-load connections. Refer to
the appropriate connection diagram.
ША turn OUTPUT VOLTAGE control knobs on the
deoi re (Әсе setting, and turn the controls on the
CCW position.
a unde со сае
И CO LLY
5. When current to the load must be limited to an intermed-
Pave 0 turn the CURRENT LIMITER control on both the (M) and (5)
Bp cs red current limit setting. Set current limit control
Sache end (3) units to the position indicating the current value
po be delivered by the respective unit. If no intermediate current
ШОО en the control CW on both (M) and (S) units to the
ревітісіп Tor full rated current for the maximum ambient temperature of
Operation. Refer to section on specifications.
6. Apply AC power to each supply.
ШЕН 128 Pages ky
7. Place POWER ON switches on (M) and (S) units in ON
position and check that red POWER ON indicators are lit.
8. Check that output current and output voltage meters
on Doch (M) and (S) units indicate desired values; as required, ad-
just OUTPUT VOLTAGE control amd CURRENT LIMITER control om (M) unit
to obtain correct meter indications. For non-metered models е
externally connected meters and check that correct meter indications
exist at output terminals 4 and 6 of the (M) unit, or at front panel
jacks (+) and (-) of the (M) unit; for remote sensing connection,
check at the load termination of sensing leads on terminals ٢ ٢ ٢
or the MO ue ie.
9. Power supplies are now in proper operation,
PARALLEL CONNECTION CONSTANT CURRENT OPERATION, WITH VOLTAGE LIMIT
1. Remove AC power input to each supply and place POWER ON
switch on both (M) and (S) units in OFF position before connecting
load to the supplies.
о. Determine load requirements and connect 1027 ٢ a po n s
plies as shown in figure 13. Refer to paragraph on Connection Ток
Parallel Operation.
3. Turn the CURRENT LIMITER knob on (M) unit to the desired
current setting. Turn OUTPUT VOLTAGE control knobs on the (8) unit
vo Tull CCW position,
NOTE: When setting the CURRENT LIMITER knob on the
(M) and (53 units take care to set the control o
that each unit indicates the proportion of total
current that the unio must supply,
4. When load voltage must be limited, turn OUTPUT VOLTAGE
control knobs on the (M) unit to the desired voltage limit Setting.
If no voltage limit, within rating of the supply is desire cn
controls onthe (M) unit to the full OW расся.
5. “Apply AC power to esco supply.
6. Place POWER ON switches on (M) and (S) units in ON posi-
tion and check that red POWER ON indicators are lit,
7. Check that output current and output voltage Mo Оп
both units indicate desired values; adjust OUTPUT VOLTAGE control and
CURRENT LIMITER control, as required, to obtain correct 11916307608.
For non-metered models use externally connected meters and check that
correct meter indications exist at output terminals 4 and 6 of the (M)
unit, or at front panel jacks (+) аға (-) 97 the (M) uname
8. Power supply is now in proper operation.
Page 18 LH 128
OPERATION AFTER PROTECTIVE DEVICE SHUTDOWN
| Thermostat Shutdown
The thermostat opens the input circuit only when the temperatures
of the transistor heat radiator exceeds a maximum safe value. The
thermostat will automatically reset when the temperature of the rad-
lator decreases to safe operating value. After eliminating the cause(s)
Dor overneatine and allowing time for the power supply to cool to a
Proper temperature, resume operation of the supply. Refer to approp-
riate operation paragraph in DETAILED OPERATING PROCEDURES.
| Fuse Shutdown
Internal component failure is prevented by fuses which protect the
Weomponents rom damage caused by excessive currents. Fuses will blow
n CE uu raved) current value for the fuse is exceeded. Fatigue
| failure of fuses can occur when mechanical vibrations from the installa-
tion combine with thermally induced stresses to weaken the fuse metal.
‘Many fuse failures are caused by a temporary condition, and replacing
the blown fuse will make the fuse protected circuit operative.
ILH 128 Page 19
MAINTENANCE
GENERAL
This section describes trouble analysis routine, replacement pro-
cedures, calibration and test procedures that are useful for servie-
ing the Lambda power supply. A trouble chart is provided as an aid
for the troubleshooter. Refer to the section on specifications and
features for the minimum performance standards.
TROUBLE ANALYSIS
Whenever trouble occurs, systematically check all fuses, primary
power lines, external circuit elements, and external wiring for mal-
function before trouble shooting the equipment. Failures and mal-
functions often can be traced to simple causes such as іпргорег (птрегв
and supply-load connections or fuse failure due to metal fatigue,
Use the electrical schematic diagram and block diagram, figure 14,
as an aid to locating trouble causes. The schematic dlagram contains
various circuit voltages that are averages for normal operation. Meas-
ure these voltages using the conditions for measurement specified on
the schematic diagram. Use measuring probes carefully to 71 ٢ 1-٢٢٣
ing short circuits and damaging circuit components.
CHECKING TRANSISTORS AND CAPACITORS
Check transistors with an instrument that has a highly limited cur-
rent capability. Observe proper polarity for PNP or NPN ON
ror in measurement. The forward transistor resistance is low but never
ZERO; backward resistance is always higher than the forward resistance,
Resistance between transistor collector and emitter, in either direc-
tion, varies with temperature; variation is greater for the вова
direction resistance.
For good transistors, the forward resistance for any JMN
always greater than zero.
Do not assume trouble is eliminated when only one part 18 replaced.
This is especially true when one transistor fails, causing other trans-
istors to fail. Replacing only one transistor and turning power on,
before checking for additional defective components could damage the
replace d component.
When soldering semi-conductor devices, hold the lead being soldered
with a pair of pliers placed between the component and the solder joint
to provide an effective heat sink.
Page 20 LH 128
NOTH: The leakage resistance obtained from a
ler resistance check of a capacitor is not
ED ап indication of а faulty capacitor. Іп
all cases the capacitors are shunted with resis-
tances, some of which have low values. Only a
dead short is a true indication of a shorted
Bapacıtor.
PRINTED CIRCUIT BOARD MAINTENANCE TECHNIQUES
ШИА ГОТ 13 intact but not covered with solder it is а
бой contact. Do not attempt to cover with solder.
| 2. Voltage measurements can be made from either side of the
"board. Use a needle-point probe to penetrate to the wiring whenever
в Pprovective coating is used on the wiring. А brass probe can be
.K о an alligator clip adapted to the measuring instrument.
З. "Always use a heat sink when soldering transistors.
4. Врокеп or damaged printed wiring is usually the result
РЕ ео, Strain or careless soldering. To repair small
breaks, tin a short piece of hook-up wire to bridge the break, and
¡holding the wire in place, flow solder along the length of wire so
спас it becomes: part of the circuitry.
5. When unsoldering components from the board, flow the
solder onto the Soldering iron tip; never pry or.force loose a part
to Бе removed.
TROUBLE CHART
КҮТ CEMAET 18 intended as a guide for locating trouble causes,
"апа is used along with the schematic diagram.
The Operacing conditions assumed for the trouble chart are as follows:
(a) AC power of proper voltage and frequency is present
at input terminals.
(b) Either positive or negative terminal is connected to
ehassis ground.
(с) The power supply is connected for constant voltage with
local sensing. See schematic; dotted lines indicate
jumpers connected for local sensing operation.
‚IH 128 Page 21
Symptom
1. POWER ON lamp
DS1 does not light
with POWER ON switch
in ON positions no
output voltage
2. Unable tond:
just output volt-
age
Sur Zero vo kt DE
output, with POWER
ON indicator 116
Page 22
TROUBLE CHART.
Probable Cause
No power input;
POWER ON switch
Sl defective; de-
fective fuse Fl;
thermostat 52
open, fuse Fl blown
Damaged OUTPUT
VOLTAGE controls
supply operating as
constant current
source with cross-
over at CURRENT
LIMITER setting
OUTPUT VOLTAGE con-
GEO LS Gure uly
CCW
Short circuit across
output of supply
series regulator
section open
R37, R38 defective,
open Q4, CR18-20
Emitter followers open
Current sensing re-
sistor open
Improper preference
supply operation as
indicated by voltage
between output term-
inal CENGE: on
fine regulator board
replace 52%
Remedy
Check power source, line
cord апа 1116 ۹777 1 plugs
replace F1;
shut off 116 و ٢٢ ٢ uc
cool and check ambient
temperature
Replace Fl; if it blows
immediately, check diodes
CR14-17 and capacitor Da
replace as necessary
Check ВТА and RIB for
shorts and/or open, re-
place as necessary
Remove load and check for
shorts and/or improper
supply-load connections;
refer to appropriate diss
gram for correct connection
Check OUTPUT VOLTAGE con-
trols for proper setting
and correct as necessary
Check load and load con-
nections, correct as nec-
essary
Check Q10-Q15 for open,
replace as necessary
Check R37, R38, ӨШ, ORIS-28
for open, replace as nec-
essary
Check Q8 and Q9 for open,
replace as necessary
Check R43 for open, re-
place as necessary
The reference voltage be-
tween terminal 7 and Т.Р.
should be 7.5. Bo کل
if this voltage does not
exist, then check Q6 for
open, Q5 for short, ORO
and CR9 for short or CR10
and CR11 for open; гер1асе
as necessary 3
ІН 128
Symptom
Д Hieh ripple
at line frequency
pp twice line fre-
quency and unregu-
lated DC output
5. Same as 4,
except inter-
mittent
бы > High ripple
at frequeney other
than line or twice
line frequency
T. Large spikes
at output
LH 128
TROUBLE CHART (cont'd
Probable Cause
Series regulator
transistors shorted;
emitter followers
shorted; voltage
amplifier ‘open
Defective main
rectifier: causes
ripple at twice
line frequency
Line voltage too
low
Foreign matter fallen
into unit
Emitter follower
Ico resistors open
or changed value
causing thermal run-
a-way
03611132019 due. to
defective component
in filter network
Capacitor C10, CTI
open
Remedy
Check and replace as
necessary: Q10-Q15;
Q8, Q9 and Q3
Cr1i4-17 in addition
to 08-012 and 93
Check and correct AC
input voltage at supply
terminals
Check for loose bench
hardware and wire clip-
pings that may have
fallen through cover
Check R33, R34 and R36
values and replace as
necessary
Check for open Cl, C2
and check for open and/or
short in HIS, CGsand Co,
R11 network and replace
defective component
Replace C10, Cll as
necessary
Page 23
ADJUSTMENT OF CALIBRATION CONTROLS
|
Whenever parts are replaced, adjust calibration controls only when
voltage and current indications are improper and do not reflect maxi- |
mum ratings,
Adjust Calibration Control R5 as Follows: |
1, Remove AC power input to the supply and place POWER ON
switch in OFF position,
2, Unsolder wiper of R5 from resistor housing.
3, Operate the power supply for constant voltage with local-
sensing Jumpers connected as shown in figure Y, and no external load.
4, Turn OUTPUT VOLTAGE control knobs fully clockwise and,
using a DC voltmeter of one percent accuracy or better, adjust R5 to
provide output voltage Eq MAX + 0,25 volts at 25°C ambient; where Eo
MAX 18 the rated output voltage of the supply.
5, After adjustment 18 completed, remove AC power input
to the supply and solder wiper of R5 to potentiometer housing,
Adjust Calibration Control Н1) as Follows:
1, Remove AC power input to the supply and place POWER ON
switch in OFF position,
2. Unsolder wiper of R14 from resistor housing.
3, Turn OUTPUT VOLTAGE control knobs and CURRENT LIMITER
control fully CW,
4, Operate the power supply for constant current crossover,
connected as shown in figure 4, with a short circuit across the output
terminals,
5, Adjust КІЛ for 2.52 ampere output, using any DC ammeter
of one percent accuracy or better,
6, After adjustment 19 completed, remove AC power input to
the supply and solder wiper of НІЛ to potentiometer housing.
PERFORMANCE CHECKS
Checks With Constant Voltage Operation
Check the ripple and regulation of the power Supply using the test
connection diagram shown in figure 15, Use suggested test equipment
or equivalent to obtain accurate results, Refer to SPECIFICATIONS AND
VEATURES for minimum performance standards,
Page 24 LH 128
Set the differential meter, DC VIVM (John Fluke Model 801H or equiva-
lent ) to the selected power supply operating voltage. Check the power
Supply load regulation accuracy while switching from the load to no-
load condition. Long load leads should be a twisted pair to minimize
AC pick-up.
Use a Variac to vary the line voltage from 105-135 or 135-105 volts
AC and check the power supply line regulation accuracy on the VTVM
differential meter.
Use a VIVM, Ballantine 320 or equivalent, to measure rms ripple volt-
age of the power supply DC output. Use oscilloscope to measure peak-
to-peak ripple voltage of the power supply DC output.
Checks With Constant Current Operation
Check the ripple or regulation of the power supply using the test
connection diagram shown in figure 16 or 17. Refer to SPECIFICATIONS
AND FEATURES for minimum performance standards.
Check the power supply load regulation accuracy while switching from
ШЕ ИТ to load condition. Measure the voltage across sens-
ing resistor Rs. Use John Fluke Model 801H or equivalent for the VIVM
connected across Rs. For Rs, use a resistor having the same value as
ПАВЕ 1 the unit being tested. To obtain regulation figure,
Substitute values obtained into regulation formula:
AE
Rs
where AE is the voltage change in milli-
volts and Rs is the resistance of the sens-
ing resistor.
= Regulation in milliamperes,
1 ٢ - тату the line voltage from 105-135 or 135-105 volts
АС and check the power supply line regulation accuracy using VTVM and
. the regulation formula:
AE
Rs
To measure rms ripple current of the power supply DC output, use a
Ballantine Model 320 or equivalent meter and obtain ripple current Ir
by substituting measured values into formula:
BORN C. ete
E go E
s LH 128 š Page 25
SERVICE
When additional instructions are required or repair service
desired, contact the nearest Office. оғ the Lambda Electronic sm PDA
where trained personnel and complete facilities are ready to assist
you.
Please inelude the power supply model and serial number together
with complete details of the problem. On receipt of this information,
Lambda will supply service data or advise shipping for factori epai
service.
All repairs not covered by the warranty will be billed ао
an estimate forwarded for approval before work is started.
PARTS ORDERING
Standard components and special components used in Lambda power
supply can be obtained from the factory. In case of emergencias
ical spare parts are available through any Lambda office;
The following information must be included when ordering parts:
1. Model number and serial number of power supply
and purchase date.
2. Lambda part number.
Description of part together with circuit designatlon.
4. If part is not an electronic part, or is пов В
provide a description, function, and location "MD
part.
Page 26 LH 128
CIRC,
` DESIG.
С1*
C2
C3
C4+
C5
C6+
СТ
C8
C9
C10
C11
C12
C13,
C14
C15+
C16+
C17
C18
C19-
C23
C244 +,
C25
CR1
thru
CR4
CR5
CR6
CRT
added to the model no.
au CEE ERS OM this listing.
PARTS LIST
The electrical parts located on this model are listed here
together with parts for models that carry the (FM) or (S) suffix.
Enc 1157 also is valid for the same LH models with letter A
Parte. ror в opblon and У option are included
MODELS LH 128, LH 128FM, LH 1288
LAMBDA UNIT
DESCRIPTION NO, PRICE
Cap., elect., 5 mfd CBN-50-014 $1.45
-10% +100% 150 VDC,
175V Surge
Cap., elect., 520 mfd CBR-52-025 2.15
-10% +100%, 100 VDC,
130V Surge
Cap., tant., 2.5 mfd CBN-25-010 1.80
-15% +75% 100 vde
Cap., mica 470 mmfd CCJ -47 -004 . 46
+20%, 300 VDC
Cap., mylar .01 mfd CGL-10-002 ‚36
+10%, 200 VDC
Same as C5
Cap., tant., 1. 0 mfd CBN-10-009 1.33
+20%, 35 VDC
Cap., elect., 75 mfd CBP-75-009 1.96
-10% + 100%, 55 VDC,
75V surge
Cap., mylar, .10 mfd CAM-10-012 .65
+10%, 200 VDC
Cap., mylar, .22 mfd CGM-22-002 .41
+10%, 6
Not assigned
Cap., elect., 3,100 mfd CBS-31-024 11.97
-10% +100%, 110 VDC,
140V surge
Cap., ceramic, 0.02 mfd CDL-20-003 .30
+20%, 125 VAC
Cap, mylar, .0068 mfd CGK-68-001 .34
+10%, 200 VDC
Cap, ceramic, 240 mmfd CDJ-24-001 504
+20% 1000 VDC
Same as C5
Same as C7
Not assigned
Cap., mylar, .01 mfd CGL-10-002 . 36
+10% 200 VDC
Rectifier FBL-00-030 1.40
Rectifier FBL-00-043 1.40
or
FBL-00-036 .60
Same as CR1
Same as CR5
CIRC,
DESIG.
CR8
CRI#
CR9
CR10,
CR11
CR12
CR13
CR14
thru
CR17
CR18
thru
CR23+ +
р51її
DESCRIPTION
Rectifier, zener diode
Rectifier, zener diode
Rectifier, zener diode
Rectifier
Not assigned
Not assigned
Rectifier
Rectifier
Same as CR1
Pilot Light Assembly
Fuse, cartridge, 6.25
amperes, "SLO-BLO"
3AG
Meter, volts DC, 0-60
VDC
Meter, amperes DC, 0-3
amperes
Transistor, PNP
Transistor, NPN
Transistor, reference
element
Transistor, NPN
Transistor, NPN
Transistor, NPN
Transistor, NPN
Transistor, NPN
Res., two-sec., ww,
var., 12,000 ohms total,
+5%, 2w each section
Res., film, 2, 400 ohms
+5%, 1/2w
Res., wirewound, 6.2
ohms +5%, 2w
Res., wirewound, 1, 250
ohms +1%, 2w
Res., var., ww, 600
ohms +10%, 1-1/2w
MODELS LH 128, LH 128FM, LH 1288 (Cont)
LAMBDA
NO.
FBM-1N965B
FBM-1N3029B
FBM-Z105
FBL-00-036
FBL-00-039
FBL-00-054
or
FBL-00-037
HRD-00-007
FFC-06-250
EBP-60-015
EDN-30-019
FBN-L103
FBN-L101
FBN-L104
FBN-L102
FBN-L108
FBN-35903
FBN-35903
FBN-35902
DNT-12-006
or
DNT-12-033
DCS-24-001
DFN-62-045
DES-12-010
DNR-60-012
. 58
Page 27
CIRC, LAMBDA UNIT CIRC, LAMHDA J|
DESIG, DESCRIPTION NO, PRICE DESIG, DESORIPTION NO, 4
R6 Res., comp., 150, 000 DEB-1541 $ ,12 Rat Not assigned
ohms +10% 1/2w Råbe Res., comp., 2, 200 DID-2221
R7 Res., comp., 4, 700 DEB-4721 ‚12 ohms 410%, 1/2w
ohms +10% 1/2w R29 Not assigned
R8 Res,, comp., 8, 200 DEB-8221 ‚12 thru
ohms +10% 1/2w ШЕ
R9 Res., comp., 15, 000 DEB« 1631 ‚ 14 ПЕЕ Мен, , сотр», 440 0 0132211
ohms 出 10% 1/2w 110% 1/2w
R10 Res., comp., 39, 0 DEB-3931 ‚ 12 RIA, Rea,, Wirewound, 0 DPR 206061
ohms +10% 1/2w Rab ohma 45%, 7۷
R11 Ros., comp., 100 ohms DEB-1011 ‚12
+10% 1/2w R36 Same as R11
R12 Res,, comp., 3,300 DEB-3321 ‚12 ROY Rəs., wirewound, 3,5 DFN«35-047
ohms +10% 1/2w thru ohma 42%, Sw
R134 Res,, comp., 390 ohms DEB-3911 (Ad RAA
+10% 1/2w n43 Res., wirewound, 0, 21 БИМ 4
R14 Res,, var,, ww, 5,000 DNS-50-015 ‚ 43 ohma 45%, ۷
ohms 410%, 1-1/2w [ Ros,, comp., 1, 000 DEB«1021
RI5 Res., film, 4,700 отв — DCS-47-003 ‚26 ohma 410% 1/2w
45%, ۷ 14644 Game as 4 >
R16 Bui, var.) ЫП DNR-50-013 1,00 Bitt Awitch, toggle, SPAT 0821160171
ohms 15%, буу „11.
R17 Not assigned FDA»=11-034
R18 Res,, wirewound, 500 DER-50-011 ‚07 82 Thermostat VKA-137-014
ohms +1%, 2W ті Transformer ABA» 40
R19 Res., wirewound, 7,500 1018-1-00 1, 22 11% Binding post, red НАС-01-206
ohms 41%, 2w | J2* Dinding post, white WAC»01«205
R20 Res., comp., 330 8 DEB-3311 ‚12 Jar Binding pont, black НАС-01-207
%10% 1/2w 41% Tent jack, red HAR »00-002
R21 Same as R11 J2** Teal jack, black HAN 006001
R22 Res., film, 12, 000 ohms — DCT-12-000 ‚25 РЫ Muse, 5 атра PPT 05-000
45%, 1/2w R” — Нов, , ww, 3. 0 0 DFN- 30-004
R23 Res., film, 390 ohms DCR-39-001 ‚20 thru 42%, Bw
45%, iw It42
R24 Res. , win 470 DFR=-47-048 1,20
ohms 42%, 10w DA TT "n
R25 Not assigned PARTE TOR Re
R26 Нев., comp,, 9, 100 DHB-9125 ‚20
ohms 45%, 2w
* Applies to "FM" models only
** Not used on "8" and "FM" models
PARTS LIST (Cont)
MODELS LH 128, LH 128FM, LH 1288 (Cont)
Transformer ТІ changes on unit with "IE option,
MODELS LH 128, LH 128FM, LH 1288 (Cont)
Wor
transformer T1 used in this model peo standard parte 0
for the standard transformer part no, and add 517
"RU to the part no,
Price for T1 does not chango,
! This part only used on unita with serial по, prefixes А, В
+ This part only used on units bearing serial по, prefix A
++ This part not used on units bearing serial no, prefix A
TT Not used on "8" models à
"These parts only used on LH128A, LH128A- FM, LH12BA- 8
PANTS FOR "V" OPTION
The following parta
change and ۹ 7
ін added to DHT:
ri Fuge, "BLO-BLO"
1,25 amperen
111-0 Å
n52 Wes, , comp, , 120, 000 DEN» 1241 T
(081) ohma s 10%, 1/2w
11 Transformer Add Вий Han
"V" to Hop. Weg,
T1 no, }
Page 28
350
Е 1
ж
СМ
$ 200 x 7
^
у 1 150 p
o Q nå
83 g
E 100 >
> (^
^o ٣۳ —
Юю
Å ا |
٩ ۴ 20 86
CABLE LENGTH WIN FEET (BEE FIG 3)
MIG 2WIRE CONNECTION (SEE. FIG 4)
|76
150 y
W i25
4
å
HE |
dU m
Q
8 J :
5 50
25
25
FIG, 2, IMPROVED 2-WIRE CONNECTION (SEE КЇЗ б)
; Гн ы
En |
SPY LOAD
-0С604--------- le
———
FIG, 8, CABLE LENGTH WIN FEET
LOAD
NOTE.
* FOR NEGATIVE GROUND,DISCONNECT JUMPER FROM TERMINALS
5 AND 6 AND RECONNECT TO TERMINALS 4 AND 5.
FIGURE 4. TWO-WIRE CONNECTION
105-135 VAC
(9 @ (9 ®
ES am PESE ada ess, M TE e لاس en meret s eA
LOAD
NOTE: А
X FOR NEGATIVE GROUND,DISCONNECT JUMPER FROM TERMINALS
5 AND 6 AND RECONNECT TO TERMINALS 4 AND 5.
FIGURE 5. IMPROVED TWO-WIRE CONNECTION
105-135 VAC
NOTE.
X FOR NEGATIVE GROUND, DISCONNECT JUMPER FROM TERMINALS
5 AND 6 AND RECONNECT TO TERMINALS 4 AND 5.
FIGURE 6. FOUR- WIRE CONNECTION
105-135 VAC
45-480 CPS
105-135 VAC
45-480 CPS
PROG. VTGE.
20044 /VOLT
PROG. VTGE..
200411 / VOLT
(A) LOCAL SENSING (B) REMOTE SENSING
NOTE:
X FOR NEGATIVE GROUND, DISCONNECT JUMPER FROM
TERMINALS 5 AND 6 AND RECONNECT TO TERMINALS
4 AND 5.
FIGURE 7. PROGRAMMED VOLTAGE, WITH EXTERNAL RESISTOR
PROGRAMMING
VOLTAGE
PROGRAMMING
VOLTAGE
LOAD
(A) LOCAL SENSING (B) REMOTE SENSING
NOTE:
Ж FOR NEGATIVE GROUND, DISCONNECT JUMPER FROM
TERMINALS 5 AND 6 AND RECONNECT TO TERMINALS
4 AND 5.
FIGURE 8. PROGRAMMED VOLTAGE,WITH EXTERNAL PROGRAMMING VOLTAGE SOURCE
105-135 VAC
EGNE)
LOAD
NOTE:
* FOR NEGATIVE GROUND, DISCONNECT JUMPERS FROM TERMINALS
5 AND 6 AND RECONNECT TO TERMINALS 4 AND 5.
FIGURE 9. PRECISION CONSTANT CURRENT
PROG. CUR.
1009 2W.
FOR 5% TO 100%
RATED CURRENT
NOTE:
X FOR NEGATIVE GROUND, DISCONNECT JUMPER FROM TERMINALS
5 AND 6 AND RECONNECT TO TERMINALS 4 AND 5.
FIGURE IO. PROGRAMMED PRECISION CONSTANT CURRENT
[(M)UNIT — —
EH
|
| Та
eren
| og
|
|
|
| CR
05 M
| | jx
|
|
|
|
|
| Rs
|
LOAD
E
x
Wr CRs
g
lx
(A) LOCAL SENSING (B) REMOTE SENSING
NOTE:
MAKE ONLY ONE GROUND CONNECTION FOR THE SERIES COMBINATION; TO CHANGE GROUND AS
SHOWN, REMOVE JUMPER FORM TERMINALS 5 AND 6 ON (M) UNIT AND CONNECT ANY ONE OF
THE OTHER JUMPERS AS SHOWN IN DOTTED LINE.
FIGURE Il. SERIES CONNECTION
nur 1 Exo UNITS. a
105 -135 VAC
45-480CPS
105 135 VAC
45-480CPS
(A) LOCAL SENSING (B) REMOTE SENSING
NOTE:
X MAKE ONLY ONE GROUND CONNECTION FOR THE SERIES COMBINATION; TO CHANGE GROUND AS
SHOWN, REMOVE JUMPER FROM TERMINALS 5 AND 6 ON (M) UNIT AND CONNECT ANY ONE OF THE
OTHER JUMPERS AS SHOWN IN DOTTED LINE.
FIGURE 12. ALTERNATE SERIES CONNECTION
o o 8 ШШ 7
105-135 VAC 44 | | 105-135 vac ES
45-480 CPS -0 = OC | | 45-480 CPS BC = «DC
|
LEURS و يی SS SS
OOO Geo |
|
|
|
тоо
juu
|
|
NOTE:
X FOR NEGATIVE GROUND, DISCONNECT JUMPER FROM
TERMINALS 5 AND 6 AND RECONNECT TO TERMINALS
4 AND 5.
FIGURE 13. PARALLEL. CONNECTION, LOCAL SENSING
Ч3Л055082 ІМЭУУПЭ LNVISNOO ONY 39VLIOA LINVISNO2'WVH9VIO 92018 “bl 340913
glo чая
-tl 1182 910-010 دو
1ndino IN3YYND 531935 NIV
£O
له 2 1dWV
39V LTOA
, 60 80
84132۸00 1103
“ЕРЕШЕ
82 431134
НІМ УІ GH tt 2940 ФО ; 2
ЯНОМ LIN لا 3 JI1dAV له 3 ۸/۳۱٢٧ 6H9 ‘8U 331311933
узала 1V11N3Y33310 LIWIn ‘934-334 AYVITIXOV
9NISN3S ANVLIN3W31dNOO 1N3YYN9
90
YOLV 11938
531535
so
ل1 3
39N3H3439S
POWER SUPPLY
POWER SUPPLY
OSCILLOSCOPE
0
©
RIPPLE
© METER
@)
Sn Os 143 DIFFERENTIAL
U Битен METER
10
O
VARIAC IISV. AC
O
— feet)
og
<
>o
OG
Gå
(19)
9%
NOTES:
I. REGULATION AND RIPPLE CHECK METERS MUST NOT ВЕ
GROUNDED THROUGH THREE-WIRE LINE CORD TO GROUND.
2. PERFORM CHECKS WITH LOCAL SENSING CONNECTIONS ONLY.
FIGURE I5. TEST CONNECTIONS FOR CONSTANT VOLTAGE PERFORMANCE CHECKS
SWITCH
DIFFERENTIAL
METER
(VTVM)
RIPPLE
METER
VARIAC ПОМ. AC
105-135 VAC
45-480CPS
ee OÓ LINEZGND:
NOTES:
i, REGULATION AND RIPPLE CHECK METERS MUST NOT BE
GROUNDED THROUGH THREE-WIRE LINE CORD TO GROUND.
2. PERFORM CHECKS WITH LOCAL SENSING CONNECTIONS ONLY.
FIGURE 16. TEST CONNECTIONS FOR CONSTANT CURRENT PERFORMANCE CHECKS
POWER SUPPLY
LOAD
SWITCH
RIPPLE
METER
O
O LINE GND.
oo
<
E
og
23
wo
og
NOTES:
I. REGULATION AND RIPPLE CHECK METERS MUST NOT BE
GROUNDED THROUGH THREE-WIRE LINE CORD TO GROUND.
2. PERFORM CHECKS WITH LOCAL SENSING CONNECTIONS ONLY.
FIGURE 17. TEST CONNECTIONS FOR PRECISION CONSTANT CURRENT PERFORMANCE CHECKS
DIFFERENTIAL
METER
(VTVM)
-——— 1
GENERAL DESCRIPTION
Rack adapter LRA-1 is designed for
use in equipment racks where rugged-
ized mounting of units is required.
The adapter can be used with or with-
out chassis slides.
Вак adapter LRA-2 is designed for
simpie applications of rack installa-
tion where chassis slides and rugged-
ized mounting of equipment are not
required.
Both rack adapter LRA-1 and LRA-2
can be used to install 1/4-rack or
1/2-rack power supply units into equip-
ment racks. Each adapter can accept
various combinations of 1/l and 1/2-
rack units up to four 1/4-rack units
or two 1/2-rack units.
INSTALLATION OF 1/2 RACK UNITS INTO
LRA-1
To install 1/2-rack power supply
units, remove slide numbers 2 and 3
and/or 6 and 7, together with securing
hardware and associated slide bar nut.
Using slide screws and slide bar nuts
that were removed, store removed slides
on the frame at the rear of the adapter
where screw clearance holes are pro-
vided for securing each slide to the
adapter.
SHIPMENT OF UNITS MOUNTED IN LRA-1
To protect the unit against damage
from shock and vibrations when trans-
porting adapter with installed units,
eight universal tie-down mounting
holes, located in the adapter base,
at the rear of the rack adapter, are
used to secure 1/4-rack and/or 1/2-
Pack units into the rack adapter.
Secure each unit using two 6-32 x 5/8
Screws, two lockwashers and two spacers
installed from the bottom side of the
rack adapter. See detail A for typical
securing hardware. Eight spacers are
Supplied with rack adapter LRA-1.
RUGGEDIZED MOUNTING
When ruggedized mounting of units
is required, follow the procedure
described for SHIPMENT OF UNITS
MOUNTED IN LRA-1. See detail A for
typical securing hardware.
MOUNTING CHASSIS SLIDES
Mount chassis slides using the
following hardware. To assure unre-
Stricted mounting of units into the
adapter designated screw lengths
must not be exceeded. Insert screws
into designated holes and secure
slide in position using long bar nut
supplied with rack adapter LRA-1.
CHASS ES TRAK NO, отет:
OSSE o 10/16 fl-na(82?);
use A holes.
JONATHAN NO. 130 QD:
6-39 x 1/2 Ғ1-һа(82%);
use В апа € holes.
GRANT PULLEY NO. 4435:
5-22 K 5/16 fi-hd(100");
use B and D holes.
USING BLANK PANELS AND BLANK CHASSIS
Blank front panels Model LBP-10
and LBP-20 are available for cover-
ing any 1/4-rack or 1/2-rack opening
respectively. The blank panels can
be used with rack adapter LRA-1 and
LRA-2 whenever a 1/4-rack or 1/2-rack
space in the adapter is not occupied
ву a unit.:
ition using four 6-32 x 3/8 pan-head
screws supplied with the rack adapter.
Paneled blank chassis Models LBC-10
(1/4-rack size) and LBC-20 (1/2-rack
size) are available for any 1/4-rack
or 1/2-rack equipment design package.
These blank chassis enable the user
of rack adapters LRA-1 and LRA-2 to
design system equipment that can be
packaged on ready-made chassis that
are compatible with existing system
components. Both blank chassis can
be used with rack adapters LRA-1
and LRA-2.
Secure each panel in pos-
REAR TIE-DOWN MOUNTING HOLES
(FOR RUGGEDIZED MOUNTING
SEE DETAIL "д" )
SLIDE BAR NUT
SLIDE
NOS. 2 83
LRA-|
LOCKWASHER
SPLIT, NO.6
БЕ SCREW, NO. 6-32 x A
DETAIL A
LRA2
FRAME
REAR
OVER CHASSIS:
гт (OVER CHASSIS) —-
TE 8
=)
È
| ITS Ye)
17
19
7% ТУР:
(№ RACK MOUNTING)
22 TYP.
(1/4 RACK
MOUNTING)
SLIDE
NOS.687
MOUNTING HOLES PROVIDED FOR CHASSIS SLIDES:
"B'a"C" HOLES — LAMBDA SLIDES NO. KHT-30-007 (I PAIR), LENGTH=16,TRAVEL=15
"ea
"A"H
"В" 5
"с" &"D" SLOTS ARE 5/32 WIDE х 1/4 LONG
lig х Эв SLOT (TYP)
TABLE OF WEIGHTS
>
ша- | 12 | 18 |
ЕГІС ШЕШЕГЕ
"А" HOLES - CHASSIS TRAK, INC.
"D" HOLES — GRANT PULLEY CO.
OLES ARE 1/4 DIA.
LOTS ARE 5/32 WIDE X 1/2 LONG
FIGURE 18.
NO. CTS-116
NO.4435 -LENGTH=16,TRAVEL=15
LONG BAR NUT (FOR OUTSIDE
SLIDE MT'G.)
RACK ADAPTERS LRA 1, AND LRA 2
b
E
74
SCB 128 С
R24
470 42% REFERENCE SUPPLY Ma
10 — үкі — 624 一 一 一 一 一 一 -- — —— -------------------- 2 АЕ
sorts IT | |
i @ د
l. RESISTOR VALUES ARE IN OHMS UNLESS OTHERWISE NOTED. Ф) (өз) жы) o toov. N
2. RESISTOR WATTAGE 1/2 WATT; RESISTORS ABOVE 2 WATTS `), FE Ç 2 SERIES (+9۷) RS 1250 21%
ARE WIREWOUND UNLESS OTHERWISE NOTED. (922 CRIO ( ) REGULATOR å RIS RI4 RS ЕЕ = 600+10% 2w,ww
ў +! FBL-00-0; 500+1% 5К+ 0% р
33 rege COMPOSITION £ 10%; WIREWOUND * 5 % pe Tiran | ca. TEME WW 1 ٧ ES بې k Ç R6 Ж ере
A WISE NOTED. (34VAC) Т 55V R22 2 +61v +59.5 150K (+1.8V)
` CAPACITOR TOLERANCES: ELECTROLYTIC 10% + 100%; IMF GR6 (+1.94)
TANTALUM,-15% +75%; PAPER, %10%; CERAMIC,+20%,MICA, +20%, SURGE |2К:55% (+8.5V) 35V ; R44 ст
MYLAR, +10%; UNLESS OTHERWISE NOTED. 6) (612) 2 WFILM TANT. CR4 GR2
5. SYMBOLS: DEUX e
7.5К+1 47к%5 он 200У
} INDICATES CLOCKWISE ROTATION OF $ 2w,ww Ya WFILM OR GATE MYLAR |
HAFT. Q5 REFERENGE 2 av
å T
== INDICATES CONNECTION TO CHASSIS. Er РЗ ыен E0 EBU FBN-LIOI
JE PREREGULATOR ТУ) Ват, 27у) BN-L
ICATES ADJUSTMENT OR CALIBRATION CONTROL. (NOTE 11) VOLTAGE +60.5V 92 FBN-LIO3
~ Qi
ЕГІ INDICATES ACTUAL UNIT MARKING. +57V (4>) Е USED CRT AMPLIFIER (+.82V) IN Re |
[2] INDICATES FRONT-PANEL MOUNTED COMPONENT. CRII слу) 4: 09-00 042 en FBN-LIOI Øy EAA
FBL-00-036 FBMCNSCSE FBL-00-036 EBE002056 EEE LMFILM
Ж INDICATES FACTORY ADJUSTMENT, SEE INSTRUCTION MANUAL. R20 RIO DIFFERENTIAL (na
39K
© INDICATES TRANSFORMER LUG TERMINAL. | 20 +59,5V AMPLIFIER +
+60V (+.7V) 2.5MF
DH THIS DIODE IS LAMBDA PART NO. FBL-00-030; CAN (+.7V) 100V, TANT TBI
BE REPLACED WITH STANDARD ТУРЕ IN645 DIODE ote REAR OUTPUT
UNLESS OTHERWISE NOTED. (+1.04v) TERMINALS
6. CONDITIONS FOR CIRCUIT POINT VOLTAGE MEASUREMENTS. ара
А. CONSTANT VOLTAGE
READ ITALICIZED NUMBERS FOR CIRCUIT POINT
VOLTAGES WHILE IN CONSTANT VOLTAGE OPERATION.
INPUT: 120 VAC, 60 CPS.
OUTPUT: 60 VOLTS, OUTPUT CURRENT ZERO.
B. CONSTANT CURRENT
READ NUMBERS IN PARENTHESES FOR CIRCUIT POINT
VOLTAGES WHILE IN CONSTANT CURRENT OPERATION.
INPUT: I20 VAC, 60 CPS, 30*C AMBIENT.
SERIES REGULATOR
06 R42
FOR LHI28FM ONLY
MIT саа
(2)
OUTPUT: O VOLTS, OUTPUT CURRENT 2.4 AMPS (SHORT CIRCUIT). с13,С14 ба
INDICATED VOLTAGES ARE TYPICAL VALUES AND ARE DG (25 МГ
UNLESS OTHERWISE NOTED. سا اح
DC MEASUREMENTS TAKEN WITH 20,000 OHMS / VOLT
VOLTMETER BETWEEN —DC (TERM. 4) AND INDICATED POINTS
UNLESS OTHERWISE NOTED.
7. DESIGNATIONS ARE LAMBDA PART NUMBERS.
INDICATES TERMINAL LOCATED ON TERMINAL BOARDS "А",
"С" &'D' OR PRINTED WIRING BOARD "B".
|
=|
014
FBN-35902
013
FBN-35902
9. COAT BOTH SIDES OF MICA WASHER WITH DOW CORNING
NO. 340 SILICONE GREASE.
IO. C24, C25, R45, R28, CR23, 07 NOT USED ON UNITS BEARING
SERIAL NO. PREFIX А; C4, C6, CIS, СІ6, A RI3 ONLY USED ОМ
UNITS WITH SERIAL NO. PREFIX "А". (SEE SCHEMATIC NO. SCB |28 A)
| RATING TABLE | TABLE
IENT MAX.
TEMP. LOAD
012
FBN-35902
30°C
|. CRS WAS FBM-IN3029B ON UNITS WITH SERIAL NO. PREFIXES А, В. me
12. F2 NOT USED ON MODELS LH 128, LHI28S, LHI28FM ой 60°C
FBN-35902 FOR LHI28FM| ONLY 71°C
13. FI IS 3AMPS, AND R52 IS ADDED FOR UNITS WITH "У" OPTION
ONLY.
14. R37 THRU R421S 3.0 OHMS, SW ON UNITS WITH A SUFFIX.
MICA
INSULATING
1 WASHER
(+80.5\)
оо
FBN-35902
FOR WIRING OF POWER SUPPLY
TO LOAD REFER TO POWER
SUPPLY-TO-LOAD WIRING DIAGRAMS,
CAUTION (NOTE 13)
NOT AT CHASSIS GROUND POTENTIAL
DO NOT SHORT TO CHASSIS GROUND
MAIN RECTIFIER
99
DA
“--..сна5515
Fi 9م
Y
DOTTED CONNECTIONS SHOWN ON|
6.25 AMP ] | TBI INDICATE JUMPERS IN
GROUND E FOR LHi28 а PLACE FOR ^2 WIRE CONNECTION.”
TYPICAL CRI4 THRU CR22 Å қ LHI28FM ONLY |
CR5 A ся? SLO-BLO |
FBL-00-043
(NOTE 13) | { 3 THIS SCHEMATIC APPLIES TO UNITS E
BEARING SERIAL NO. PREFIXES B,C |
y ! } 200V
y NOTE 9 н MYLAR or ma
MICA SCHEMATIC DIAGRAM
TYPICAL IR AL =
CRI TO CR4 ACRE SRO CRI, Porras 25356 REGULATED POWER SUPPLY
свг-002020 SIS GROUND AN
en M $e [MODELS LHI28,LHI28S,LHI28FM |
LS LHI28,LHI28S,L
Fores FOR LHI28FM ONLY WHT لا =
BASE = MODELS LHI28A, LH (28 A-S, LHI28A
MITTER SMS ASIE
у, TRANSISTOR, PIN VIEW
EMITTER Q7 8 Q9
TYPICAL TYPICAL TRANSISTOR, PIN VIEW
CR8 CRY QIO THRU 015
Ap NOTE LAMBDA
5 | [ } "iECTROMICS com.
TRANSISTOR TRANSISTOR, BOTTOM VIEW MELVILLE, L. L, NE! ٣ !
BOTTOM VIEW 01 TO 04,06
95
t
TYPICAL
CRS A Ся?
FBL-00-043
ti
TYPICAL
CRI TO CR4 8 CRE
FBL-00-030
(NOTE 5)
d
TYPICAL
CR8
SCB 128А
NOTES
RESISTOR VALUES ARE IN OHMS UNLESS OTHERWISE NOTED.
RESISTOR WATTAGE 1/2 WATT; RESISTORS ABOVE 2 WATTS
ARE WIREWOUND UNLESS OTHERWISE NOTED.
RESISTOR TOLERANCES: COMPOSITION + 10%; WIREWOUND + 5 %
UNLESS OTHERWISE NOTED.
CAPACITOR TOLERANCES: ELEGTROLYTIC-10% + 100%;
TANTALUM,-15% +75 %; PAPER, + 10%; CERAMIC, + 20%; MICA, +20%;
MYLAR, 210%; UNLESS OTHERWISE NOTED.
SYMBOLS:
INDICATES CLOCKWISE ROTATION OF SHAFT.
== INDICATES CONNECTION TO CHASSIS.
© INDICATES ADJUSTMENT OR CALIBRATION CONTROL.
لا INDICATES ACTUAL UNIT MARKING.
[__] INDICATES FRONT-PANEL MOUNTED COMPONENT.
Ж INDICATES FACTORY ADJUSTMENT, SEE INSTRUCTION MANUAL.
© INDICATES TRANSFORMER LUG TERMINAL.
ېو
THIS DIODE IS LAMBDA PART NO.FBL-00-030; CAN
BE REPLACED WITH STANDARD TYPE IN645 DIODE
UNLESS OTHERWISE NOTED.
CONDITIONS FOR CIRCUIT POINT VOLTAGE MEASUREMENTS.
A. CONSTANT VOLTAGE
READ ITALICIZED NUMBERS FOR CIRCUIT POINT
VOLTAGES WHILE IN CONSTANT VOLTAGE OPERATION.
INPUT: 120 VAC, 60 CPS.
OUTPUT: 60 VOLTS, OUTPUT CURRENT ZERO.
B. CONSTANT CURRENT
READ NUMBERS IN PARENTHESES FOR CIRCUIT POINT
VOLTAGES WHILE IN CONSTANT CURRENT OPERATION.
INPUT: 120 VAC, 60 CPS, 30°C AMBIENT.
OUTPUT: O VOLTS, OUTPUT CURRENT 2.4 AMPS (SHORT CIRCUIT).
INDICATED VOLTAGES ARE TYPICAL VALUES AND ARE DC
UNLESS OTHERWISE NOTED.
DC MEASUREMENTS TAKEN WITH 20,000 OHMS /VOLT
VOLTMETER BETWEEN —DC (TERM. 4) AND INDICATED POINTS
UNLESS OTHERWISE NOTED.
DESIGNATIONS ARE LAMBDA PART NUMBERS.
INDICATES TERMINAL LOCATED ON TERMINAL BOARDS "А",
"С" &"D" OR PRINTED WIRING BOARD "B".
9. COAT BOTH SIDES OF MICA WASHER WITH
DOW CORNING NO. 340 SILICONE GREASE.
MICA
INSULATING
CAUTION pao:
NOT AT CHASSIS GROUND POTENTIAL amid
E — — |
DO NOT SHORT TO CHASSIS GROUND а
GROUND
CRI4 THRU CR22
Y | NOTE 9
MICA
TYPICAL =
INSULATING
CRIO,CRII, دوو مل c.
TRANSISTOR, PIN VIEW
MITTER Q8 8 Q9
TYPICAL TRANSISTOR, PIN VIEW
CR9 QIO THRU 015
8 7
[ОЕ _ CO] 8
5 E
TRANSISTOR, TRANSISTOR, BOTTOM VIEW
BOTTOM VIEW о! TO 04,06
Q5
Fl
6.25 AMP
TYPE 3AG
"SLO-BLO"
470%2% REFERENCE SUPPLY
AUXILIARY
RECTIFIER
E [^ |] på |
asi me C 7 SERIES (+9v) R5 1250 +1%
H REGULATOR } ris @ RI4 "T 600+10% 2W,WW |
500+1% 5к+0% жим
+L SME Q6 2W,WW * 17 | 2 +60v
FBN-LIO2 ۱٧ R6 в
R23 R22 C7 150K <
75 V SURGE 390 +5% +68v *67V +] 1MF CR6
1W,FILM |2К%5% 95٧ (+8.5V) 35V RI3
мг ° cl5
оета TANE .0068MF CR2
وم RIS cie 200V,MYL,
E 7.5 К +1% ATKt5* Ril 200V
2W,WW Yo WFILM MYLAR
(47) cro Q5 240MMF| 94 c4
FBM-IN30298 | РВМ 04 +60V 1000V | Fen-Lioı Ё 470 MMF
PREREGULATOR И ur, LT) ERA FBN-LIOI FBN-LIO3 300УМІСА
5. 7 VOLTAGE uere
AMPLIFIER
+57V (9) Е USED сат (“2 (+.82V) <N R2 |
سم (17У) FBL-00-043 CURRENT FBL-00-043 er Ben
FBL-00-036 CR8 LIMIT 35V,TANT R3 | COMPLEMENTARY gate
٢ FBM-IN965B AMPLIFIER DIFFERENTIAL f MIU.
330 AMPLIFIER +
+60V 2.5MF =p
GV) xL 100V, TANT
y 2595] (т) | REAR OUTPUT
623) TERMINALS
== .۰م
CURRENT LIMITER
MAX. RATINGS
SERIES
REGULATOR
FOR LHI28FM ONLY
P| |
Із
(2)
63,614 |
02 MF
125 УАС
СЕВАМ!С |
Qis
FBN-35902
FOR LHI28FM ONLY
(+80.5\)
FOR WIRING OF POWER SUPPLY
FBN-35902 TO LOAD REFER TO POWER
SUPPLY-TO-LOAD WIRING DIAGRAMS.
DOTTED CONNECTIONS SHOWN O
TBI INDICATE JUMPERS IN
PLACE FOR `2 WIRE CONNECTION." |
MAIN RECTIFIER
FOR LHI28 A
LHI28FM ONLY
Q9
FBN-35903 Lå
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200V FOLLOWERS
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Q8 FBN-35903
SCHEMATIC DIAGRAM
REGULATED POWER
FOR LHI28FM ONLY
CONSUME
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We warrant each instrument manufactured by
us, and sold by us or our authorized agents, to be
free from defects in material and workmanship, and
that it will perform within applicable specifications
for a period of five years after original shipment. Our
obligation under this guarantee is limited to repairing
or replacing any instrument or part thereof, (except tubes
and fuses) which shall, within five years after delivery to
the original purchaser, be returned to us with transportation
charges prepaid, prove after our examination to be thus defective.
We reserve the right to discontinue instruments without notice, and
to make modifications in design at any time without incurring any
obligation to make such modifications to instruments previously sold.
LA MB DA ELECTRONICS co
515 BROAD HOLLOW ROAD + MELVILLE, L. L, NEW YORK + 516 MYRTLE
1
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A VANS - SUBSIDIAR Y
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395 5 es
| å 54895
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