CHAPTER 5: MAINTENANCE
DUAL PULSE 125
STORED ENERGY RESISTANCE WELDING POWER SUPPLY
990-270 5-3
3. Push the POWER Switch to OFF, disconnect BP13 or BP14 and remove U5. Push the POWER
Switch to ON again.
NOTE: Before proceeding, allow unit to warm up for a minimum of 5 minutes.
4. Use 1
st
Pulse Program, % ENERGY▲, and the SAVE keys to set 100% on the % ENERGY
display. Connect a Digital Microammeter from TP6 to TP0 (Ground). Adjust R104 for a
reading of -1000 ± 0.5 µA.
NOTE: During calibration, reading may drift, but must not drift more than ±1.5 µA.
5. Switch the POWER Switch to OFF. Install U5. Reconnect BP13 and/or BP14. Switch the
POWER Switch to ON.
6. Set 100% ENERGY. With an accurate Digital Voltmeter connected across the Capacitor Bank,
adjust the E
out
Trimpot to 408 ± 1.0 volts.
7. Set 0.6% ENERGY and adjust R97 to 0 ±0.5 mv at TP5.
8. Set 99.5% ENERGY. Quickly press RUN 3 times. The decimal point should begin to flash.
Adjust the Calibration Display Trimpot, R142, so that the display remains exactly 99.5%.
Repeat Steps 7 and 8 above until all readings are within tolerance.
9. Press and hold RUN. Press ENERGY▲ to set 116% ENERGY. The Capacitor Bank Voltage
should now read 440 ± 2 volts.
10. Adjust R12 slowly clockwise until U3 Pin 14 goes high. Quickly readjust R12 slightly counter-
clockwise until Pin 14 just barely goes low. This must be done within less than 5 seconds or
the Circuit Breaker will trip (open).
11. Switch the POWER Switch to OFF then ON. This will restore the Automatic 100% Limit.
Recheck Step 6 above.
12. Set to 0.6% ENERGY
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