Miller Axcess 675 Owner's Manual - Page 32

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SECTION 8 − TROUBLESHOOTING

8-1. Removing Cover and Measuring Input Capacitor Voltage

Tools Needed:
5/16 in
+ lead to left bus terminal, − lead to right bus terminal
+ lead to left bus terminal, − lead to right bus terminal
+ lead to left bus terminal, − lead to right bus terminal
OM-217 751 Page 28
Y 900 Volts dc can be present on the capacitor bus and
significant DC voltage can remain on capacitors after
unit is Off. Always check the voltage on all three
inverter assemblies as shown to be sure the input
capacitors have discharged before working on unit.
1
2
1
2
1
2
Turn Off welding power source, and
disconnect input power.
Remove cover
1
Power Interconnect Board
PC2
2
Voltmeter
Measure the dc voltage across the
+ bus terminal and − bus terminal on
PC2 as shown until voltage drops to
near 0 (zero) volts. Measure input
capacitor voltage on all three
inverter
assemblies
before
proceeding.
Proceed with job inside unit.
Reinstall cover when finished.
802 985 / Ref. 803 825-A