TROUBLESHOOTING WELDSKILL 250, 350
Manual 0-5186 6-7
Troubleshooting
6.08 Check Main AC Contractor
AC Contactor Testing Multimeter Lead Placement Impedance
Contactor ON
Positive meter lead to testpoint 5
0 to 0.5 Ω
Positive meter lead to testpoint 9
Positive meter lead to testpoint 6
0 to 0.5 Ω
Positive meter lead to testpoint 10
Positive meter lead to testpoint 7
0 to 0.5 Ω
Positive meter lead to testpoint 12
Positive meter lead to testpoint 8
0 to 0.5 Ω
Positive meter lead to testpoint 11
Positive meter lead to testpoint 13
> 1M Ω
Positive meter lead to testpoint 14
AC Contactor Testing Multimeter Lead Placement Impedance
Contactor OFF
Positive meter lead to testpoint 5
> 1M Ω
Positive meter lead to testpoint 9
Positive meter lead to testpoint 6
> 1M Ω
Positive meter lead to testpoint 10
Positive meter lead to testpoint 7
> 1M Ω
Positive meter lead to testpoint 12
Positive meter lead to testpoint 8
> 1M Ω
Positive meter lead to testpoint 11
Positive meter lead to testpoint 13
0 to 0.5 Ω
Positive meter lead to testpoint 14
Table 6-4 AC Contactor, Multimeter set to measure Diode Voltage
Measurements may be made directly onto the main input rectifier. AC1 and AC2 may be measured from the pins
on the mains supply plug with the main power switch set to the ON position.
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