TOC
TOC
TROUBLESHOOTING & REPAIR | |||
|
| WELD CONTROL FEEDBACK TEST (continued) |
|
Return to Master
Return to Master TOC
Return to Master TOC
16.If the voltage readings are different, check the wiring and connections between the welding terminals and the control PC board. See the wiring diagram.
17.Connect the millivolt meter probes between lead #206S+
18.If the machine cannot produce 200 amps of weld current, the correct millivolt signal will need to be calculated by dividing the read- ing displayed on the external ammeter by 8. See the following explanation.
19.The shunt used in this machine will produce 50 millivolts at a load of 400 amps, or 8 amps per millivolt.
20. To calculate the correct millivolt signal for a given load, you divide the number of amps displayed on the ammeter by 8.
Example: If your ammeter reads 75, (75/8 = 9.4) If the shunt is working correctly, and th wiring between the shunt and the control PC board is in good condition, the meter con- nected at the control PC board should be reading about 9.4 millivolts.
21. If the millivolt reading is incorrect, check the wiring between the shunt and the control PC board for damage, grounds, and faulty con- nections. If the wiring is good, the shunt and lead assembly is faulty and should be replaced.
22. Perform the
. Case Cover Replacement
Procedure
Return to Section TOC
Return to Master TOC
