Miller Electric Invision 456MP - Manual (Page 41)

OM-193 267 Page 37
6-4. Removing Right Side Panel and Measuring Input Capacitor Voltage in
575 Volt Models
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.
Tools Needed:
5/16 in
Ref. ST-801 718 / Ref. ST-801 536-A
2
3
+ lead to lower right
terminal, − lead to
upper right terminal
1
! 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.