Miller Axcess 300 Gebruikershandleiding - Pagina 33
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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
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
inverter assembly as shown to be sure the input
capacitors have discharged before working on unit.
1
Turn Off welding power source, and
disconnect input power.
Remove cover
1
2
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
assembly before proceeding.
Proceed with job inside unit.
Reinstall cover when finished.
2
Interconnect Board PC2
Voltmeter
on
inverter
802 985 / Ref. 803 670-A
OM-216 967 Page 29