Miller AXCESS 450 CE, Owner'S Manual, Page: 39 / 56

OM-220 389 Page 33
SECTION 10 − TROUBLESHOOTING
10-1. Removing Cover and Measuring Input Capacitor Voltage
!
Turn Off welding power
source, and disconnect in-
put power.
Remove cover
1
Power Interconnect Board
PC2
2 Voltmeter
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 on both inverter
assemblies before proceeding.
3
Typical Bleeder Resistor
An example of a typical bleeder
resistor is shown on this page.
Proceed with job inside unit.
Reinstall cover when finished.
Tools Needed:
5/16 in
802 985 / Ref. 803 419-B
!
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 both inverter assemblies as shown to be
sure the input capacitors have discharged before
working on unit.
1
2
+ lead to left bus terminal, − lead to right bus terminal
1
2
+ lead to left bus terminal, − lead to right bus terminal
3
Typical Bleeder Resistor
#16 AWG 1000 volts dc
insulation rating, approx
3 in (76 mm) leads
25 to 1000 ohm, 5
watt resistor