Miller Electric Big Blue 502P - Manual (Page 34)

OM-491 Page 30
7-7. Overload Protection
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 CB10 (Not
Shown)
4 Circuit Breaker CB11
5 Circuit Breaker CB12
6 Circuit Breaker CB13
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 max OCV circuit.
If CB11 opens, the max OCV circuit
does not work and open circuit volt-
age is variable at all times (see max
OCV note under Weld Controls in
Section 5-2).
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.
2 1
6
5
4
802 170-A