Overload Protection; Troubleshooting - Miller Electric Trailblazer 251 NT Owner's Manual

7-7. Overload Protection

7-8. Troubleshooting

A. Welding
Trouble
No weld output.
5
1
2
2
Check control settings.
Check weld connections.
Disconnect equipment from auxiliary power receptacles during start-up.
Place Output (Contactor) switch in On position, or move switch to Remote 14 position and connect
remote contactor to Remote 14 receptacle RC1 (see Sections 4-8 and 5-1).
Check fuses F1 and F2, and replace if necessary (see Section 7-7).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
Y Stop engine.
Tools Needed:
.
3/8 in
1
CB5 protects the 24 volt ac output
to Remote 14 receptacle RC1. If
CB5 opens, 24 volt ac output to
RC1 stops.
2
CB6 protects the 115 volt ac output
to Remote 14 receptacle RC1. If
CB6 opens, 115 volt ac output to
RC1 stops.
Press button to reset breaker.
3
F6 protects the engine wiring sys-
tem from overload. If F6 opens,
4
engine will not crank.
4
5
Remove side panel.
F1 protects the exciter excitation
winding from overload. If F1 opens,
weld and auxiliary power output
3 stops.
F2 protects the stator winding from
overload. If F2 opens, weld output
stops. Auxiliary power will still be
available.
Replace any open fuses. Reinstall
cover before operating unit.
Remedy
When a circuit breaker or fuse
opens, it usually indicates a
more serious problem exists.
Contact a Factory Authorized
Service Agent.
Circuit Breaker CB5
Circuit Breaker CB6
Fuse F6 (See Parts List)
Fuse F1 (See Parts List)
Fuse F2 (See Parts List)
ST-801 945-C / Ref. ST-189 925-A
OM-486 Page 27