Section 4 - Maintenance &Troubleshooting; Routine Maintenance; Circuit Breaker Cb1; Unit Overload - Miller Millermatic 250X Owner's Manual

SECTION 4 – MAINTENANCE &TROUBLESHOOTING

4-1. Routine Maintenance

3 Months
Replace unreadable labels
Clean and tighten weld terminals
6 Months
Blow out or vacuum inside.

4-2. Circuit Breaker CB1

2
1

4-3. Unit Overload

Thermostat TP1 in rectifier Z1 protects the unit from damage due to overheating. If TP1 opens, wait several minutes
before trying to weld.
Y Disconnect power
before maintaining.
OR
4
.
Repair or replace
cracked weld cable
Remove drive roll and
carrier. Apply light coat
of oil or grease to drive
motor shaft.
3
Maintain more often
during severe conditions.
1 Circuit Breaker CB1
If CB1 opens, wire feeding stops.
2 Circuit Breaker CB2
Overcurrent at pin D of receptacle
RC7 will cause CB2 to open.
3 Welding Gun
Check gun liner for blockage or
kinks.
4 Wire Drive Assembly
Check for jammed wire, binding
drive gear or misaligned drive rolls.
Allow cooling period and reset
breaker. Close door.
802 475-A / Ref. 800 797-C
OM-1320 Page 21