Section 5 − Maintenance &Troubleshooting; Routine Maintenance; Circuit Breaker Cb1; Unit Overload - Miller Electric Migmatic 271 Owner's Manual

SECTION 5 − MAINTENANCE &TROUBLESHOOTING

5-1. Routine Maintenance

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

5-2. Circuit Breaker CB1

5-3. Unit Overload

Thermal switches TP1 in XFMR and TP2 in SR1 protect the unit from damage due to overheating. If the thermal indica-
tor illuminates, wait for unit to cool allowing fan motor to run before trying to weld. If unit is cool and no weld output
continues, contact Factory Authorized Service Agent.
OM-223 194 Page 18
Y Disconnect power
before maintaining.
OR
1
3
.
Repair or replace
cracked weld cable
Remove drive roll and
carrier. Apply light coat
of oil or grease to drive
motor shaft.
2
Maintain more often
during severe conditions.
Ref. 802 990
1 Circuit Breaker CB1
CB1 protects the unit from over-
loading of drive motor M1. If CB1
opens, wire feeding stops.
2 Welding Gun
Check gun liner for blockage or
kinks.
3 Wire Drive Assembly
Check for jammed wire, binding
drive gear or misaligned drive rolls.
Allow cooling period and reset
breaker. Close door.