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TROUBLESHOOTING & REPAIR | |||
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| WELD CONTROL FEEDBACK TEST (continued) |
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TEST PROCEDURE
1.Place the idle switch in the “HIGH IDLE” position.
2.Place the mode switch in the
3.Place the weld terminals switch in the “WELD TERMINALS ON” position.
4.Make sure that nothing is plugged into either Amphenol receptacle.
5.Connect the resistive load bank and the ammeter to the weld output terminals per the equipment manufacturerʼs instructions; also connect the voltmeter probes across the weld output terminals.
6.Start the machine and, apply a load of about 200 Amps, as shown on the external amme- ter. If the machine will not produce 200 amps, apply as much load as you can.
7.Compare the readings shown on the exter- nal ammeter and voltmeter to the amps and volts displayed on the front panel of the machine.
8.If the readings shown on the front panel dis- plays are about the same or very close to the reading on the external meters, the feedback is probably good, and this test is complete.
9. If the readings differ significantly, continue with this procedure
10. Turn off the engine and release the load from the weld terminals. (The load bank and ammeter should remain connected, but the load should be released.)
11. Perform the
. Case Cover Removal
Procedure
12.Locate plugs P3 and P6 on the control PC board. See figure #1. Remove the plugs and check for dirt, corrosion, damaged, expanded, or incorrectly positioned termi- nals. Repair or replace wiring components as needed and reconnect the plugs to the control board.
13.Restart the machine and apply a load across the weld terminals that measures about 200 amps. If the machine will not produce 200 amps of current, apply as much load as you can.
14.Using the voltmeter, measure and note the DC voltage at the weld output terminals.
15.Check the voltage between leads #204S+
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