Lincoln Electric SPIRIT II 275 Technical Manual page 127

Spirit II User's Manual
9. With a start signal applied, check for the proper DC voltage (refer to TABLE 1) at the
output terminal block between Electrode and Work, which is located on the left side
of the unit.
If the proper DC voltage is present, the chopper is working properly.
Spirit II
400 Amp
Spirit II
275 Amp
Spirit II
150 Amp
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 green, 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
J1-5 (ground) to J1-2
J1-5 (ground) to J1-3
If ALL of the voltages are present, replace chopper. If any of the voltages are not
present, go to step 13:
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TABLE 1
Chopper 1
3 Phase OCV 3 Phase
AC (DC)
255 370
225 325
208 300
Section 6: Maintenance &Troubleshooting
Chopper 2
OCV 3 Phase
AC (DC) AC
255 370 255
225 325 N/A
N/A N/A N/A
+15vdc Supply
+5vdc Supply
+5vdc (PWM Signal)
6-13
Chopper 3
OCV
(DC)
370
N/A
N/A