Lincoln Electric 718115 Spirit II 275 - Manual (Page 133)

Spirit II User’s Manual Section 6: Maintenance &Troubleshooting
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10. If the proper DC voltage is not present at the output terminal block, check the 200
amp fuse F9 (chopper 1), fuse F10 (chopper 2) or fuse F11 (chopper 3) located on
the bottom right of the output bus bars.
If the fuse is open, replace chopper and fuse.
11. If the fuse(s) is good, check if the chopper PWM LED illuminates when a start signal
is applied:
a) check D24 on the DSP PCB – If D24 doesn’t illuminate, replace DSP PCB.
b) check D2 on the chopper PCB – If D2 doesn’t illuminate, go to step 12.
12. Check PCB power to the chopper from the DSP:
a) Push the OFF Button.
b) Disconnect the J1 plug from the chopper PCB.
c) Leave the OFF Button pushed in.
d) With a digital voltmeter, measure the following voltages on the J1 plug:
J1-5 (ground) to J1-1 +15vdc Supply
J1-5 (ground) to J1-2 +5vdc Supply
J1-5 (ground) to J1-3 +5vdc (PWM Signal)
If ALL of the voltages are present, replace chopper. If any of the voltages are not
present, go to step 13:
13. Remove primary power from the Spirit system. Check cable continuity between the
chopper PCB and DSP PCB. Use a digital voltmeter set up to read resistance
(ohms) and make the following measurements:
Chopper (1) J1-1 to DSP J7-1
Chopper (1) J1-2 to DSP J7-2
Chopper (1) J1-3 to DSP J7-3
Chopper (1) J1-5 to DSP J7-4
Chopper (2) J1-1 to DSP J8-1
Chopper (2) J1-2 to DSP J8-2
Chopper (2) J1-3 to DSP J8-3
Chopper (2) J1-5 to DSP J8-4
Chopper (3) J1-1 to DSP J9-1
Chopper (3) J1-2 to DSP J9-2
Chopper (3) J1-3 to DSP J9-3
Chopper (3) J1-5 to DSP J9-4
If ALL of the continuity readings are good, replace DSP PCB.