Overload Protection - Miller Big Blue 302D Owner's Manual

8-7. Overload Protection

2 1
7
6
5
3
Y Stop engine.
.
When a circuit breaker or fuse
opens, it usually indicates a
more serious problem exists.
Contact Factory Authorized
Service Agent.
1 Fuse F1
2 Fuse F2
F1 and F2 protect the stator exciter
winding from overload. If F1 opens,
weld and auxiliary power is low or
stops entirely. If F2 opens, weld out-
put is low or stops entirely. 4 kVA/
kW auxiliary power is still available.
3 Circuit Breaker CB6
(CC/CV Models Only)
4 Circuit Breaker CB10 (Not
Shown)
5 Circuit Breaker CB11
6 Circuit Breaker CB12
7 Circuit Breaker CB13
CB6 protects the 24 and 115 volt ac
output to remote receptacle RC14,
and 24 volt output to field current
regulator board PC1 (CC/CV mod-
els only). If CB6 opens, weld output
and 24 and 115 volt output to RC14
stops.
CB10 protects the engine battery
circuit. If CB10 opens, the engine
will not crank. CB10 automatically
resets when the fault is corrected.
CB11 protects the engine wiring
harness. On CC models, if CB11
opens the max OCV circuit does
not work and open circuit voltage is
variable at all times (see max OCV
note under Weld Controls in Sec-
tion 5-2). If CB11 opens on CV mod-
els, weld output stops (auxiliary
power is still available).
CB12 protects the field flashing cir-
cuit. If CB12 opens, the generator
may not excite at start-up and weld
and auxiliary power output may not
be available.
CB13 protects the engine shut-
down circuit. If CB13 opens, the en-
gine cranks but does not start.
Press button to reset breaker.
Ref. 802 313
OM-497 Page 37