LAMBDA EMI
405 ESSEX ROAD, NEPTUNE, NJ 07753
TEL: (732) 922-9300
FAX: (732) 922-9334
INSTRUCTION MANUAL FOR
83-475-001 Revision D
MODEL
SERIAL NUMBER
186.1 RECOMMENDED SPARE PARTS LIST
18
6 RECOMMENDED SPARE PARTS
175.4 TROUBLESHOOTING
155.3 CALIBRATION
155.2 INSPECTION AND CLEANING
155.1 GENERAL
15
5 MAINTENANCE AND TROUBLESHOOTING
144.4 A200 BUCK CONVERTER
134.3 SIGNAL FLOW (SCHEMATIC 01-000-225)
134.2 POWER FLOW (SCHEMATIC 01-475-005)
134.1 GENERAL
13
4 PRINCIPLES OF OPERATION
73.2 MODES OF OPERATION
73.1 TURN-ON CHECK OUT PROCEDURE
6
3 OPERATING INSTRUCTIONS
52.5 MECHANICAL
52.4 COOLING
52.3 POWER REQUIREMENTS
52.2 MECHANICAL CHECK
52.1 INITIAL INSPECTION
5
2 INSTALLATION
21.2 SPECIFICATIONS
21.1 DESCRIPTION
2
1 GENERAL INFORMATION
TABLE OF CONTENTS
Description Page
MEMORANDUM TO USERS OF E/M POWER SUPPLIES IN RACK INSTALLATION
All E/M power supplies have been designed and tested to provide full rated current and voltage
throughout the specified line voltage range at the rated ambient air temperature. To achieve this
maximum rating, airflow as provided by the internal fans, proportioned and directed by chassis
openings and internal partitions, must not be impeded.
On the ESKI supplies, air enters the unit from the front, at the location of the fan, and is
transferred through the supply in a horizontal direction toward the rear. Airflow is reduced any
time there is a negative pressure at the air inlet or positive pressure at the air outlet. Each fan is
capable of providing 100 to 130 cubic feet per minute of air flow (CFM) at zero static pressure.
The supply itself produces some restrictions to this flow so that approximately 80% of the airflow is
available. As static pressure increases, caused by additional restriction of airflow external to the
power supply, the efficiency of the fans drops significantly and airflow is greatly reduced. This
reduction in airflow causes a substantial increase in internal temperatures of the supply, frequent
thermostat shut down and reduced power supply reliability.
Ideally, when power supplies are mounted in a rack, the rack should have no sides or rear covers.
Since this is usually not practical or safe, the installer must consider the effect of any enclosure on
power supply airflow. Since the power supplies must be supported by some sort of rail along the
sides of the supply, front to rear, this rail must be chosen for proper strength but must not be either
too close to or extend up too far along the side of the supply or airflow will be blocked. To
minimize vertical height use an angle iron of substantial cross section and unequal leg dimension.
Do not support the power supply from the front panel only, in an attempt to minimize this problem.
The rail does not need to be continuous from the front to back to support the supply, but for safety
and ease of installing and removing the supply it usually is.
Most commercial racks are available with louvered side panels and doors. Side panels are also
available with an extended depth which provides an additional plenum space on each side of the
rack for improved airflow.
The ambient air, especially in a tropical climate can also be very hot. Frequently, high humidity is
also present. This situation, while not ideal for power supply longevity, should in itself cause little
difficulty. When combined with insufficient airflow, however, it can significantly affect power
supply.
Page 1 of 18
83-475-001 Rev. D
1 GENERAL INFORMATION
1.1 DESCRIPTION
This manual contains operation and maintenance instructions covering the Electronic
Measurements, Inc. series of ESKI power supplies. These supplies are constant current
regulated sources of DC power, which also contain boost voltage and ignition pulse to
start Xenon Lamps.
1.2 SPECIFICATIONS
The following specifications describe the operational characteristics of this series of
power supplies. All units are shipped with an AC barrier strip located on the back of the
unit.
AC INPUT: THREE PHASE UNIT
208/220 VAC ± 10% three phase 3 wire delta. 47-63 Hz optional 208/220 VAC ± 10%
single phase 47-63 Hz.
AC INPUT : SINGLE PHASE UNIT
208/220 VAC ± 10% Single Phase 47-63 Hz.
AC INPUT CURRENT: THREE PHASE UNIT
22 Amps per phase for 3 phase power
AC INPUT CURRENT: SINGLE PHASE UNIT
45 Amps
REGULATION:
The current regulation for line variations of ± 10% is .1% over the range of input AC.
The load current regulation for a 25% load change is .1%.
STRIKE VOLTAGE: 25KV
BOOST VOLTAGE: 800 Volts
RIPPLE:
The output ripple measured with the circuit of Fig. 1 will be ≤ 0.8V
p-p
at 40 Amps current
output.
EFFICIENCY:
The AC input to the DC output is 92%.
RESPONSE TIME: The programming response time is approximately 1 millisecond for a
50% current change.
STABILITY:
The maximum deviation in output current for an 8 hour period is .05% under conditions of
constant line, load and temperature after a 2 hour warm-up.
Page 2 of 18
83-475-001 Rev. D
TEMPERATURE COEFFICIENT:
The output current is .02% /C of rated output current.
TEMPERATURE:
Operating continuous duty performance within specification in any ambient temperature
between 0°C and 60°C with appropriate derating above 50°C. Units may be safely stored
at temperatures of -55°C to 85°C.
COOLING:
Cooling air driven by a long life fan enters the enclosure at the front and exits at the sides
and rear.
ISOLATION:
Non-line isolated power supply circuitry is fully isolated from chassis.
LEAKAGE:
Per UL 1012 with standard RFI filter.
CONTROLS:
All ESKI power supplies are provided with a U/L listed circuit breaker which combines
primary circuit protection with on/off control. Current adjustment is via a single (10) turn
potentiometer located on the front panel. Indication of the output current is provided by
an ammeter mounted on the front panel. Indication of lamp voltage is provided by a
voltmeter mounted on the front panel.
PROTECTIVE CIRCUITS:
Adjustable over-current kill circuit drops output to zero in case the current regulation goes
out of control. Automatic reset over-temperature switch disables power output.
PROGRAMMING:
All ESKI power supplies may be remotely controlled via a connector for current, power
supply enable, current readback, ignition and interlock functions.
DIMENSIONS:
Three Phase P/S 5 1/4' H X 19" W X 15" D
Single Phase P/S 7" H X 19" W X 17" D
WEIGHT:
Three Phase P/S 45 Pounds
Single Phase P/S 55 Pounds
Page 3 of 18
83-475-001 Rev. D
Figure 1 Loss Pass Filter
Page 4 of 18
83-475-001 Rev. D
2 INSTALLATION
2.1 INITIAL INSPECTION
Before shipment, this instrument was inspected and found to be free of mechanical and
electrical defects. As soon as the unit is unpacked, inspect for any damage that may
have occurred in transit. Check for broken knobs or connectors, that the external surface
is not scratched or dented, meter faces are not damaged and that all controls move
freely. Any external damage may be an indication of an internal problem.
2.2 MECHANICAL CHECK
Remove twelve 6-32 machine screws from the top cover.
Cover can now be removed.
Inspect for loose hardware, damaged components or broken wires.
Check operation of controls.
NOTE: If any damage is found, follow the "Claim for Damage in Shipment" instruction in
the warranty section of this manual.
2.3 POWER REQUIREMENTS
A suitable source of AC power is required for this supply. The unit will operate on 50 or
60 Hz line frequency. The line impedance from the power source should be fairly low
since high peak currents are drawn. The three phase input is rated for 25 Amps and the
wire size should be at least 10 gauge. The current input for single phase is rated for 50
Amps and the wire size should be at least 8 gauge. The connecting wire size is larger
than service rating.
2.4 COOLING
Each power supply enclosure is cooled by a suitable sized blower fan exhausting warm
air to the rear. Fresh air intake is from the front. None of the surfaces of the supply
radiates heat to adjacent equipment. At least five inches of space should be allowed
behind the supply and one inch along each side for unimpeded air flow.
2.5 MECHANICAL
The supply is capable of being rack or bench mounted. Horizontal mounting is preferred.
However, mounting in any position is allowed. For rack mounting, additional support
other than that provided by the front panel is required. Angle iron slide mounting support
or cross beam member support is required for permanent mounting. The sides of each
supply are equipped with mounting holes for rack slide mounting.
The type of rack slide mountings are:
C300S18 (Chassis Trak Corporation, Telephone #317-897-7000)
This mount will work for both single and three phase units.
For bench mounting, four mounting feet are provided which are adhesive-mounted to the
base surface of the supply.
Page 5 of 18
83-475-001 Rev. D
3 OPERATING INSTRUCTIONS
Figure 2 Front Panels
Page 6 of 18
83-475-001 Rev. D
3.1 TURN-ON CHECK OUT PROCEDURE
The front panel surface contains all the controls and indicators necessary to operate the
supply in its normal mode. The following checkout procedure describes the use of the
front panel control and indicators (Fig. 2) and insures that the supply is operational. This
preliminary check of the power supply is done without a load connected.
DANGER:
Before conducting this test, the output terminal guard must be removed and at
least 6" of space around the output terminal must be maintained.
3.1.1 Check the jumpers in the connector P101 on the back of the set.Pin 1 should be
jumpered to Pin 9. Pin 3 to 10, Pin 7 to 8, and Pin 6 to Pin 12. This jumper
configuration will allow the supply to be operated via the front panel controls.
3.1.2 Set CURRENT CONTROL (5) to maximum CCW.
3.1.3 Connect the AC power to the terminal strip TB1 on the back of the power supply.
3.1.4 Turn the CIRCUIT BREAKER (1) on/off switch to "ON". the fans will start
immediately, but there is a 10 to 15 second delay before voltage or current output
will occur. This is caused by the soft start circuit.
3.1.5 The UNIT ON INDICATOR (2) should be on. Turn LAMP ON/OFF SWITCH (3)
on.
3.1.6 Advance CURRENT CONTROL (5) slowly. The DC VOLTMETER (7) will deflect
from zero to maximum rating of the supply as this control is advanced clockwise.
3.1.7 Push the IGNITION BUTTON (4) and hold for 10 seconds. The ignition spark gap
should be heard snapping approximately once per second. (If automatic ignition is
present the spark gap should be heard just after the output voltage is present in
Step 3.1.6).
3.1.8 Turn the current control maximum CCW and turn off the CIRCUIT BREAKER (1).
These tests indicate the power supply is operating and is ready to be connected to
a lamp.
3.2 MODES OF OPERATION
This supply is designed so that its mode of control is selected by the jumpers on P1. The
following chart details the function of each pin.
PIN # FUNCTION
1 & 9 External ON/OFF switch connection, ON when shorted.
3 & 10 External interlock connection shorted is normal.
4 & 2 Current monitor output (pin 4) & common (pin 2).
5 External modulation input.
6 or 7 & 11 External control (0-5 V) input (pin 6 or 7) com (pin 11).
8 One milliAmp current source output.
12 Front panel potentiometer connection.
Page 7 of 18
83-475-001 Rev. D
3.2.1 NORMAL OPERATION (FIG. 3 AND FIG. 3A)
Pins 1 & 9 jumpered, Pins 3 & 10 jumpered, Pins 7 & 8 jumpered and Pins 12 & 6
jumpered.
This is the normal mode of operation. All performance specifications, unless
otherwise stated, are defined in this configuration. Should any problems develop,
the supply should be returned to this normal mode of operation for
trouble-shooting.
3.2.2 CONNECTING LOAD
The lamp load must be connected to the two 1/4 - 20 screw terminals at the rear
of the unit.
WARNING:
This is a transformerless unit without an Isolation Transformer and the
output terminals are NOT isolated from the input line. All terminals and
external circuits must be insulated from ground to withstand a high pot
voltage of at least 30 kVdc.
The output terminals' polarity is silk-screened adjacent to the terminal.
3.2.3 REMOTE PROGRAMMING
This supply can be programmed by an external resistance (0 - 5k Ohms) or an
external voltage (0-5V). The wire connecting the programming terminals of the
supply to the remote programming device should be twisted, or if strong AC or RF
fields are present, shielded.
CAUTION:
If the remote programming function fails or is inadvertently adjusted, the
output current could go to 110% of maximum output. This will cause the
over-current circuit to shut down the supply until it is reset by turning off
the AC circuit breaker.
3.2.4 REMOTE PROGRAMMING BY EXTERNAL RESISTANCE
The current output is controlled by an external 0 to 5000 Ohm resistance.
Replace the jumper between Pins 6 & 12 of P1 with an external resistance
connected between Pins 6 & 11. At 5000 Ohms the supply will output full current.
At less than full output the programming resistance is determined from the
following formula:
Resistance = (5000 X Desired Current / Full Rated Current Output)
Page 8 of 18
83-475-001 Rev. D
Figure 3 1 Phase Front Panel Control Hookup
Page 9 of 18
83-475-001 Rev. D
Figure 3A 3 Phase Front Panel Hookup
3.2.5 REMOTE PROGRAMMING BY AN EXTERNAL VOLTAGE
The jumpers between Pins 7 & 8 and 6 & 12 are removed and an external voltage
is fed to Pins 6 & 11. The positive side to Pin 6 & the negative to Pin 11.
3.2.6 EXTERNAL INTERLOCK & ON/OFF SWITCH (FIG. 4 AND FIG. 4A)
The supply can be connected to an external interlock system, which will prevent
operation until the external interlock circuit is closed. The current and voltage is
less than 25 mA and 15 volts. The interlock should be connected between Pins 3
& 10 of P1. When these two Pins are open, the power supply will not ignite or
allow current to the lamp.
The supply can also be controlled, ON & OFF, by an external switch closure. The
switch contacts should be able to handle at least 25mA and 15 volts. To turn the
supply off, open the jumper between Pins 1 & 9 of P1 and likewise to turn it on,
short between Pins 1 & 9.
3.2.7 EXTERNAL CURRENT MONITOR
Page 10 of 18
83-475-001 Rev. D
The current from the supply can be monitored by reading the voltage between
Pins 4 & 2 of P1. This voltage is set for 1 volt = 10 Amps when received from the
factory and can be loaded with a resistance of 10k Ohms.
Figure 4 3 Phase External Control Hookup
Page 11 of 18
83-475-001 Rev. D
Figure 4A 1 Phase External Control Hookup
Page 12 of 18
83-475-001 Rev. D
4 PRINCIPLES OF OPERATION
4.1 GENERAL
This supply rectifies and filters the AC input voltages, then a 20kHz switching buck
regulator regulates the output DC. Also supplied is a 25kV ignition pulse and 800V boost
to start the lamp. The A100 PCB compares the output current to the input reference and
adjusts the duty cycle up or down to maintain regulation.
Figure 5 Duty Cycle Regulation
4.2 POWER FLOW (SCHEMATIC 01-475-005)
The 208/220 VAC 3 Phase or 208/220 VAC 1 Phase power is applied to TB1 then to CB1
and on to the line filter A300. From the line filter, the AC is rectified by CR4, (CR4a and
CR4b for 1 Phase), and is filtered by L1 and C1, (L1a, L1b, C1a, C1b and C1c for 1
Phase P/S). The resulting DC is then chopped by the buck converter A200 and again
filtered by L2 & C2. CR5 is a blocking diode, which allows the injection of a boost voltage
and T1 is the ignition transformer, which produces the 25kV start pulse.
4.3 SIGNAL FLOW (SCHEMATIC 01-000-225)
The 208 VAC is applied to T3 & T4, which reduces the voltage to 15 VAC, which is
rectified by CR45, CR49, CR47 and filtered by C33, C35 and C37. U12, U13 and U14
regulate the rectified DC to produce three independence DC voltages, which supply the
control circuit with operating potential.
The main PWM is U8 and its' output is via P4, Pins 4 & 5. The control amplifier (Pins 1 &
2) is connected to the shunt and provides for current regulation. The control amplifier
(Pins 4 & 5) is connected to the attenuated voltage output and provides for the maximum
unloaded voltage output.
Pin 9, the shutdown pin, is controlled by U7, which in turn is controlled from the protection
circuits U1, U3 and U4. U5A, U6, T2 & U10B isolate the control signal which is used to
unbalance the inputs to the PWM (Pins 1 & 2).
The shunt voltage is amplified by U10A and fed to the isolation circuits of U11, T1 and
U4B. This channel allows the output DC current to be monitored by an external monitor
isolated from the DC shunt.
Page 13 of 18
83-475-001 Rev. D
Q3, U5B and CR22 produce a 1mA current source at P1 (Pin 8). The supply requires a 0
to 5 volt signal to output, zero to full current out. To get this voltage on Pin 7 (P1), the
1mA current source is conducted through a 0 to 5k Ohm pot to produce the control
voltage.
The protection circuits consist of an ignitor "time out" timer, low voltage inhibit, soft start
timer, interlock and overcurrent detector. All the protection circuits either allow Q1 to be
turned on, which turns off U7 (thus disabling the PWM) or they keep Q1 off (enabling the
PWM).
The igniter "time out" timer consists of U1B, U1A and U2. When Q1 is turned on, the
output of U1B goes high. This in turn charges C1 through R1. If this is allowed for
sufficient time, C1 will charge to a voltage greater than the 5.1V (REF) and this will cause
U1A to latch on, thus turning on Q1 and disabling the PWM. During the time that C1 is
being charged, U2 can terminate the time out by shorting C1. U2 is turned on when a
current of greater than 4 Amps is flowing from the output.
The low voltage inhibit is made up of U3A. the unregulated +12 volt supply, which
represents line voltage, is attenuated and input to U3. this input is compared to the
5.1V(REF) and turns on Q1 when the line voltage is below 180 VAC, disabling the PWM.
The soft start circuit (Q2 and U3B) turns on the soft start relay K1. Q2, which turns on the
relay, is kept biased off until C5 charges to 5.1 volts. This takes about 10 seconds.
During these 10 seconds, the main filter capacitors' (C1) charging current is limited by the
400 Ohms of R1 for the 10 seconds, then K1 closes, shorting out the limiting resistor.
The interlock circuit is made up of CR12 & 13 and P1 (Pins 1, 9, 3 and 10). When these
pins are shorted, the input bias to Q1 is disabled, allowing the PWM to operate.
The over-current detector, U4A, monitors the voltage readback from the shunt. And, if
the voltage exceeds 5.1 volts, the output of U4A is latched high again turning on Q1,
which disables the PWM.
4.4 A200 BUCK CONVERTER
The A200 buck converter can be thought of as a switch connected between E2 and E3.
This switch, in the form of an IGBT transistor, (Q1, 2 and 3) is switched on and off at a 20
kHz rate. To get more lamp current, the switch is closed longer than normal. The choke
L2, on the main schematic, filters the chopped output, caused by the switch opening and
closing, to produce pure DC. For example, if the switch is turned on and off at a 50%
duty cycle, the output DC output voltage will be 1/2 the input DC at E1 and E2.
The switch control signal is fed to the A200 PCB from the A100 via P1. U1 is an optical
coupler to isolate the control signal. The output from U1 is amplified by U2 and fed to two
FET's which produce a bipolar drive to the transistor switches Q1, Q2 and Q3. U3
supplies the upward pull for the gate drive and U4 provides a pull down to quickly
discharge any input capacity. The output of U3 and U4 is isolated by R9 and R10 for
Q1.CR10 is a clamp diode to prevent excessive drive. Like-wise R11 and R12 are for Q2
and etc.
There are 3 switches in parallel and for this, only one will be explained. CR1 is the
flyback catch diode. CR4, CR5, C4 and R4 are snubbers to help shape the waveform
across the transistor switch for least power dissipation and voltage spikes. The chokes
L1A, B and C are for balancing the current between the switch transistors. C10, C1, C2
and C3 are filters for the 20 kHz switching signals.
Page 14 of 18
83-475-001 Rev. D
5 MAINTENANCE AND TROUBLESHOOTING
5.1 GENERAL
A regularly scheduled preventative maintenance consisting of a thorough cleaning of
interior and a visual inspection of the components on the circuit boards and heatsinks
mounted on the chassis floor. A relatively clean location would require at least one
inspection every six months.
5.2 INSPECTION AND CLEANING
CAUTION: Always disconnect AC power from the supply before removing the cover.
5.2.1 Remove the (12) 6-32 screws from the covers.
5.2.2 Remove the wrap-around cover by lifting upward.
5.2.3 Check for loose wire connections, burn marks etc...
5.2.4 Remove dust from in and around parts with a small brush or compressed air.
5.2.5 Check the fan to be sure it operates freely and turns when power is applied.
CAUTION:
Whenever power is applied and removed, all capacitors should be
discharged through a 10 Ohm resistor before any contact with the circuit.
5.3 CALIBRATION
This procedure applies to the adjustment and calibration of a properly functioning unit
only. Any malfunction must be corrected before proceeding with calibration. Remove the
top cover to make these calibrations.
CAUTION:
DANGER LETHAL VOLTAGES
This Power Supply contains very lethal voltage and no work should be attempted unless
the person doing the work is a highly trained electronic technician who has studied the
schematics and understands how the circuit operates and takes safety measures to
prevent injury.
(Note the location of parts: the 100 numbers are on the A100 PCB, the
300 numbers are on the A300 board, etc...)
Equipment required:
1. Oscilloscope - Dual trace, 60 MHz, isolated from ground,
Philips PM3267 or equivalent.
2. Shunt - 50 Amp 100 mV Empro HA50-100
3. Multimeter - Fluke 360 or equivalent.
4. Load - 6kW Resistive load 3.1 Ohm
Unless the power supply is found to be outside the normal tolerance, no adjustment
should be attempted.
5.3.1 CURRENT METER
Page 15 of 18
83-475-001 Rev. D
1. Connect the load in series with the shunt to the output terminals.
2. Plug in a jumpered plug for normal operation, see paragraph 3.3.
3. Connect the multimeter across the shunt.
4. Turn on the supply and adjust the output current for 80MV across the shunt.
5. Connect the multimeter between TP5 and TP15 and adjust R166 for a meter
reading of 4.00 volts.
6. Adjust R121 for a front panel meter reading of 40 Amps.
7. Turn off the supply and adjust the current control maximum CCW.
5.3.2 VOLTMETER
1. Repeat steps 1 and 2 as in paragraph 5.3.1.
2. Connect the voltmeter across the output terminals.
3. Turn on the supply and adjust the output for approximately 125Vdc.
4. Adjust R145 for a front panel meter reading of 125Vdc.
5.3.3 FULL SCALE CURRENT OUTPUT
1. Repeat steps 1, 2 and 3 as in paragraph 5.3.1.
2. Turn on the front panel current control full CCW.
3. The output current should be zero, if not, adjust R160 for zero current output.
4. Adjust the current control maximum CW.
5. Adjust R179 for the desired maximum current output. (40 Amps).
5.3.4 AUXILIARY CALIBRATION
This portion of the procedure normally does not need to be performed, unless
Paragraphs 5.3.1, 5.3.2 and 5.3.3 can not be performed.
1 mA Current Source Calibration:
1. Connect a current meter between Pins 8 and 11 of P1.
2. Adjust R137 for 1mA.
Program Limit:
1. Connect a voltmeter between TP107 and TP113.
2. Adjust R127 for a voltmeter reading of 5.1 volts.
Min. IO Detector:
1. Connect the voltmeter between E2-2 and E2-1.
2. Adjust the output current for 0 to 10 Amps. The voltmeter should switch from
13 volt to less than .6V at approximately 4 Amps.
Page 16 of 18
83-475-001 Rev. D
5.4 TROUBLESHOOTING
WARNING:
When servicing supply, dangerous voltage levels exist. Be especially careful of
personnel and equipment because this supply is not isolated from the AC line.
Almost all measurements will be made with one terminal connected to AC line
potential.
Most unit malfunctions will originate on the circuit card.
5.4.1 OVERALL TROUBLESHOOTING PROCEDURE
1. Check for obvious trouble such as input power failure, loose P1 or improper
jumpering.
2. Check the DC bias supplies.
a. 12 volts TP112-TP113
b. 15 volts TP114-TP115
c. 15 volts TP116-TP117
3. Check voltage between TP106 and TP113. This voltage should be adjustable
from 0 to 5 volts by the front panel control. If not, check P1 jumpering, Q103,
U105B and CR122.
4. Check voltage between TP111 and TP115. It should be proportional to
the 0 to 5 volts of step 3. If not, check U110B, T102, U106 and U105A.
5. Check voltage at the collector of Q104 (metal case) and TP115. It should be
above 12Vdc. If not, check the voltage at TP101, TP102, TP103, TP104,
anode CR112 and CR113 to TP113 to determine why Q104 is on.
6. Output not controllable. Check the following:
a. Pulses P104 (Pins 5 and 4) controllable by current control on front panel.
b. Pulses at U202 (Pin 7).
c. Pulses at junction of R209 & 210, R211 & 212 and R213 & 214.
d. Check Q201, Q202 and Q203.
7. IF Q201-Q203 have been changed, be careful to thoroughly clean the heatsink
and insulator. Then reapply a light coating of silicone heatsink compound.
Then evenly tighten the mounting screws.
Page 17 of 18
83-475-001 Rev. D
6 RECOMMENDED SPARE PARTS
6.1 RECOMMENDED SPARE PARTS LIST
This list covers the recommended spare parts for the ESKI supplies made by Electronic
Measurements, Inc.
60-044-002Rectifier 65ACR5
78-014-000BE0 & G10 RimInsulator
78-022-000Alum OxideInsulator
67-066-006NTC ResistorRT301
UC352464-006-003PW ModulatorU108
MC781264-010-001Regulator 12VU112
MC781564-010-002Regulator 15VU113, U114
T1L 11364-004-007Opto IsolatorU107, 103
LM35864-002-020Op-AmpU101, 3, 4, 5
U109, 10
UC390164-003-043ICU106, U111
MOC304164-008-007Opto IsolatorU301
2N634863-002-001TRIACQ301
20-395-000A100 PC BoardA100
53-002-012MOV 575 VACTH3
53-002-002MOV 250 VACTH1, TH2
51-002-002Fan 230 VACB1
5k Ohm67-055-007Current ControlR10
69-012-001800V Spark GapV1
66-105-002Ammeter/VoltmeterM1, M2
HCPC220064-002-014Opto IsolatorU210
TSC426CPA64-002-028DriverU2
IRF11063-009-008FETU204
IRFD912363-009-009FETU203
IX6M30N50A63-011-001Main Chopper XistorQ201, 2, 3
65-028-001Soft Start RelayK1
60-050-001Rect. 30A 600vCR4
MFR. NO.EM PART NO.DESCRIPTIONCIRCUIT REF.
Page 18 of 18
83-475-001 Rev. D
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