CHAPTER 2: GETTING STARTED
DUAL PULSE 125
STORED ENERGY RESISTANCE WELDING POWER SUPPLY
2-8 990-270
Replace Cover
After performing all internal selections, replace cover and screws and tighten securely. After verifying
that all necessary installation and modification procedures have been completed, connect the line cord to
the proper power outlet.
External Inputs Options
A 9-pin, sub-miniature "D" EXTERNAL INPUTS connector, located on the rear panel, is provided for
four single pole inputs which are used to: (a) remotely inhibit recharging of the capacitor bank, and (b)
remotely select Weld Schedules #1 through #7. See Appendix A for connector specifications. The pin
assignments are:
PIN FUNCTION
1 Remote Weld Schedule Selection, Control Line 2
0
2 Remote Weld Schedule Selection, Control Line 2
1
3 Remote Weld Schedule Selection, Control Line 2
2
4 Charge Inhibit Line
5 Circuit Ground
When all input pins are open, control of the power supply remains at the Front Panel. When any one of
the input pins is shorted, control of the power supply becomes remote and the Front Panel is disabled.
To use CHARGE INHIBIT, connect one wire from the normally open contacts of a user supplied switch
to Pin 4 of the EXTERNAL INPUTS connector. The second wire should be connected to Pin 5. See
figure 2-8. The switch is closed to inhibit recharging of the capacitor bank while changing schedules
using Remote Schedule Selection. Also inhibits the Schedule Display.
To use REMOTE SCHEDULE SELECTION, connect three control lines from a user supplied, normally
open contact to the EXTERNAL INPUTS connector, Pins 1, 2, and 3. See figure 2-8. Weld Schedules
are selected by shorting across Pin 5 and the appropriate pins coded to the BCD (binary coded decimal)
pattern shown in figure 2-9.
Use the following sequence to use Remote Schedule Selection:
a Select [WELD].
b Close Charge Inhibit Switch (Pins 4 & 5) - disables front panel control, inhibits charging of
capacitors.
NOTE: If the schedule displayed has not been fired, the capacitors can still discharge.
c Select BCD Schedule Number (Pins 1,2,3 & 5) - schedule is ready to be used.
d Open Charge Inhibit Switch - Schedule is displayed, capacitors charge waiting for trigger.
e After firing, immediately close Charge Inhibit (within 60 ms) - inhibits recharging.
f Select new BCD Schedule Number - new schedule is loaded, but not displayed.
g Open Charge Inhibit - Displays new schedule and capacitors charge waiting for trigger.
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