APPENDIX A: TECHNICAL SPECIFICATIONS
DUAL PULSE 125
STORED ENERGY RESISTANCE WELDING POWER SUPPLY
990-270 A-3
Output of the error amplifier inhibits the firing circuit during the charge and turndown intervals. This
helps prevent poor welds caused by firing the power supply before the capacitor bank is properly
charged or discharged.
Firing Circuit
Requires external contact closure or low logic level for firing. Internal filtering prevents premature
firing due to radio frequency interferences (RFI).
Output Pulse Characteristics
Pulse characteristics are measured at the Power Output terminals, across a non-inductive .001 ohm load
(with a tolerance of no greater than 2%), including weld cable. Rise time is measured between zero and
peak amplitude, and pulse width between the 10% amplitude points.
Table A-2. Output Pulse Characteristics
Pulse Transformer
Connections
Capacitor bank Rise Time
Pulse Length
Minimum Pulse
Height
Parallel (Short 1500 μF 0.65 ms 2.3 ms 7.0 – 7.7v
750 μF 0.45 ms 1.7 ms 6.1 – 6.7v
Series (Long) 1500 μF 1.05 ms 4.0 ms 4.5 – 5.0v
750 μF 0.80 ms 3.2 ms 4.2 – 4.6v
Welding Speed
Repetition rate is the average number of welds allowable in 1 minute based upon the thermal rating of
the system components. The averaging period used to determine the repetition rate can be as long as 20
minutes. Hit rate, or maximum intermittent welding speed, defines how fast the power supply can make
consecutive welds on a non-continuous basis. See table A-2 and figures A-1 and A-2.
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