48
Fig. 12.3 How to Check High Voltage System
Output current system
failure
Pr
HV2
failure
Insulation deteriorated in
torch path or cooling water
path
Magnetic contactor MX
failure
Does resistance exceed
20 M
Ω between welder
output terminals when torch
cable is removed?
Use 500-V megger
to measure insulation resistance
between electrode and base metal.
Does resistance exceed 20 MΩ
at electrode negative
side?
Is voltage of approx.
60 VAC applied between
connectors (HVI) Nos.
202 and 2130 on the
Pr (HV2)?
Starting relay 1Y operates.
Refer to Fig. 12.2.
High DC voltage is not
generated even when the
welding start signal is turned
ON. No discharge between
electrode and base metal.
Cause of Problem
Check Items Status
Yes
Yes
No
No
Yes
No
Yes
No
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