Measuring Input Capacitor Voltage (200/230/460 V Model Shown) - Miller Millermatic 350P Technical Manual

8-2. Measuring Input Capacitor Voltage (200/230/460 V Model Shown)

z
L
L
L
z
Tools Needed:
5/16 in.
Millermatic 350
3
1
z z
L
L
L
L L
L
L
L
z z
L Torque to 25 in/lbs (2.8 NVm)
z Torque to 31 in/lbs (3.5 NVm)
Torque all other hardware
to 17 in/lbs (1.9 NVm)
!
!
3
Turn Off welding power source and
2
disconnect input power.
Remove case.
1
2
3
Check input capacitors as shown.
Measure the DC voltage across the
positive (+) and negative (−)
terminals until voltage drops to near
0 (zero) volts.
Proceed with job inside unit.
Reinstall case when finished.
Turn Off welding power
source, and disconnect in-
put power.
Significant DC voltage can
remain on capacitors after
unit is Off. Always check the
voltage as shown to be sure
the input capacitors have
discharged before working
on unit.
Input Capacitor C3 Terminals
Input Capacitor C4 Terminals
Voltmeter
221 044-A / Ref. 803 550-A
TM-1327 Page 43