Overload Protection; Troubleshooting - Miller Trailblazer 300D NT Owner's Manual

7-8. Overload Protection

7-9. Troubleshooting

A. Welding
Trouble
No weld output.
OM-487 Page 32
6
2
1
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 Section 4-8).
Check fuses F1 and F2, and replace if necessary (see Section 7-8).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
Y Stop engine.
Tools Needed:
.
3/8 in
1
CB6 protects the 115 volt ac output
to Remote 14 receptacle RC1. If
CB6 opens, 115 volt ac output to
RC1 stops.
2
CB5 protects the 24 volt ac output
to Remote 14 receptacle RC1. If
CB5 opens, 24 volt ac output to
RC1 stops.
5
Press button to reset breaker.
3
F5 protects the throttle solenoid
from overload. If F5 opens, the en-
gine will not start at idle speed or re-
turn to idle speed.
4
F6 protects the engine wiring sys-
tem from overload. If F6 opens, the
3
engine will not crank.
5
6
Remove side panel.
F1 protects the exciter excitation
winding from overload. If F1 opens,
weld and auxiliary power output
stops.
F2 protects the stator winding from
overload. If F2 opens, weld output
stops. Auxiliary power is still avail-
4
able.
Replace any open fuses. Reinstall
cover before operating unit.
Remedy
If a circuit breaker or fuse
opens, it usually indicates a
more serious problem exists.
Contact a Factory Authorized
Service Agent.
Circuit Breaker CB6
Circuit Breaker CB5
Fuse F5 (See Parts List)
Fuse F6 (See Parts List)
Fuse F1 (See Parts List)
Fuse F2 (See Parts List)
ST-801 962-C / Ref. ST-187 602-A