Miller Electric Big 40 CAT - Manual (Page 54)

OM-4406 Page 48 Return To Table Of Contents
9-8. Overload Protection
802 170-D / Ref. 802 311
2 1
9
8
7
4
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 generator power is low or
stops entirely. If F2 opens, weld out-
put is low or stops entirely. 4 kVA/kW
generator power is still available.
3
Circuit Breaker CB4 (Not
Shown)
4 Circuit Breaker CB5
(CC/CV Models Only)
5 Circuit Breaker CB6
(CC/CV Models Only)
6 Circuit Breaker CB10 (Not
Shown)
7 Circuit Breaker CB11
8 Circuit Breaker CB12
9 Circuit Breaker CB13
CB4 protects the welding arc drive
(dig) circuit. If CB4 opens, electrode
may stick to the workpiece more fre-
quently during low voltage (short arc
length) conditions. CB4 automatical-
ly resets when the fault is corrected.
CB5 protects the 24 volt ac output to
remote receptacle RC14, and 24 volt
output to field current regulator board
PC1 (CC/CV models only). If CB5
opens, weld output and 24 volt out-
put to RC14 stops. On units with op-
tional three−phase generator, gener-
ator power output at receptacle RC5
also stops if CB5 opens.
CB6 protects the 115 volt ac output
to remote receptacle RC14 (CC/CV
models only). If CB6 opens, 115 volt
output to RC14 stops.
CB10 protects the engine battery cir-
cuit. If CB10 opens, the engine will
not crank. CB10 automatically re-
sets when the fault is corrected.
CB11 protects the engine wiring har-
ness. 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 Section 6-2). If
CB11 opens on CV models, weld
output stops (generator 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 generator power output may not
be available.
CB13 protects the engine shutdown
circuit. If CB13 opens, the engine
cranks but does not start.
Press button to reset breaker.
5