CIGWELD TRANSarc 130i, Service Manual

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TRANSARC 170i
Manual 0-5280 6-7 Troubleshooting
6.09 DC Bus voltage measurement
Apply voltage to the Power Source.
!
WARNING
There are extremely dangerous voltage and power levels present inside these Power Sources. Do not
attempt to diagnose or repair unless you have had training in power electronics measurement and
troubleshooting techniques.
Once power is applied to the Power Source, there are extremely hazardous voltage and power levels present.
Do not touch any live parts.
Art # A-11816
DC Bus Testing Multimeter Lead Placement Voltage with
Supply voltage
OFF
Upper capacitor bank Positive meter lead to testpoint 1
Negative meter lead to testpoint 2
150-200 VDC
Lower capacitor bank Positive meter lead to testpoint 2
Negative meter lead to testpoint 3
150-200 VDC
Overall capacitor bank Positive meter lead to testpoint 1
Negative meter lead to testpoint 3
300-400 VDC
Table 6-8: DC BUS, Multimeter set to measure DC volts
Note: These DC voltages are at nominal mains supply voltage of 240VAC.