APPENDIX A: TECHNICAL SPECIFICATIONS
DUAL PULSE 125
STORED ENERGY RESISTANCE WELDING POWER SUPPLY
A-2 990-270
Capacitor Bank
The full bank of four capacitors total 1500 µF ±5% at 20º C. Four capacitors are grouped in two banks
of two capacitors. At full rating, the Capacitor Banks are operated at 408 volts. The Pulse Width
characteristics as well as the Hit Rate and Repetition Rate can be changed by disconnecting one-half of
the Capacitor Bank. See the two paragraphs below.
Line Voltage Regulation
Maintains voltage on the capacitor bank within ± 0.25% of setting for a ± 13% change from the nominal
rated line voltage.
Turndown Circuit
When voltage from the error amplifier exceeds that required to turn off the charging circuit, a resistor is
connected across the capacitor bank, discharging the bank to the required level. The turndown circuit
deadband is approximately 0.6% of full scale voltage.
Line Failure Turndown
When input power is interrupted, a turndown resistor is automatically connected, discharging the
capacitor bank.
Over-Voltage Lockout
Protects the capacitor bank from damage due to circuit malfunction or improper calibration. The circuit
breaker opens, removing primary power, and the line failure turndown circuit automatically discharges
the capacitor bank. The circuit is adjusted to operate when 440 ± 1 volts is placed across the capacitor
bank.
Charge Lockout Circuit
Nominal 60 millisecond commutation pulse, generated in the microprocessor, inhibits the charging
circuit until the output SCR has been switched off.
Weld Fire Lockout
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