Removing Case And Measuring Input Capacitor Voltage - Miller Electric 456 CC Owner's Manual

5-3. Removing Case and Measuring Input Capacitor Voltage

Tools Needed:
5/16 in
Y Significant DC voltage can remain on capacitors af-
ter unit is Off. Always check the voltage as shown
to be sure the input capacitors have discharged be-
fore working on unit.
1
1
2
3
+ lead to lower right
terminal, – lead to
upper right terminal
Turn Off welding power source, and
disconnect input power.
1 Outside Handle Screws
To loosen top, remove two outside
handle screws from both handles
and all side bolts.
2 Interconnecting Board PC2
3 Voltmeter
Measure the dc voltage across the
screw terminals on RC3 and RC5
as shown until voltage drops to near
0 (zero) volts.
Proceed with job inside unit. Rein-
stall cover when finished.
ST-802 260 / ST-801 536
OM-188 422 Page 25