875DP/500DP/500HV DUAL PULSE
RESISTANCE WELDING POWER SUPPLIES
990-290
A-1
APPENDIX A
TECHNICAL SPECIFICATIONS
Type Power Supply
Stored energy power supply which can operate in a Single or Dual Pulse Mode and is capable of operating
with Air or Manually Actuated Weld Heads. Compatible with 1-Level or 2-Level Footswitches. It can
sense Single Pole, Double Pole or Optical Firing (Pressure) Switches.
The Model 875DP is rated 5.25 to 875 watt-seconds (joules).
The Model 500DP and 500HV are rated 3.0 to 500 watt-seconds.
Power Requirements
LINE VOLTAGE is single phase 100, 115, 208, or 230 volts, 50/60 Hz. The 875DP, 500DP and 500HV
use approximately 3300 watts, initially during charging, and 50 watts stand-by.
Capacitor Bank
The 875DP consists of 28 capacitors which total 10,500
μ
F ±5% at 20°C. The Capacitor Bank for the
500DP and 500HV consists of 16 capacitors which total 6000
μ
F. ±5%. The capacitors are grouped in
banks of four capacitors. At full rating, the Capacitor Banks are operated at 408 volts. The following
features are related to the capacitor bank:
Output Pulse Characteristics
Pulse width can be specified for each of the 16 weld schedules. Internal switching relays are used to
implement this feature. Pulse characteristics are measured at the power output terminals, across an
output load as follows:
875DP and 500DP: 0.001 ohm (with a tolerance of no greater than ±2%, including weld cable);
500HV:
0.004 ohm (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. See table A-1.