Removing Right Side Panel And Measuring Input Capacitor Voltage In 575 Volt Models - Miller Electric Invision 456MP Owner's Manual

6-4. Removing Right Side Panel and Measuring Input Capacitor Voltage in
575 Volt Models
Tools Needed:
5/16 in
!
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.
2
3
+ lead to lower right
terminal, − lead to
upper right terminal
1
Turn Off welding power source, and
disconnect input power.
1 Right Side Panel
To remove panel, remove screws
securing panel to unit.
2 Interconnect Board PC2
3 Voltmeter
Measure the dc voltage across the
screw terminals on PC2 as shown
until voltage drops to near 0 (zero)
volts.
Proceed with job inside unit. Rein-
stall right side panel when finished.
Ref. ST-801 718 / Ref. ST-801 536-A
OM-193 267 Page 37