Overload Protection - Red-D-Arc D502K 5+4 Technical Manual

7-8. Overload Protection

D502K 5+4
7
4
8
Y Stop engine.
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 F1 continues to open,
check integrated rectifier SR1, capaci-
tor C9, the rotor, and brush connec-
tions.
If F2 opens, weld output stops. 4 kVA/
kW auxiliary power is still available. If
F2 continues to open, check field cur-
rent regulator board PC1, the rotor,
and brush connections.
3 Circuit Breaker CB4 (Not Shown)
2 1
4 Circuit Breaker CB5
5 Circuit Breaker CB10 (Not
Shown)
6 Circuit Breaker CB11
7 Circuit Breaker CB12
8 Circuit Breaker CB13
CB4 protects the welding arc drive
(dig) circuit. If CB4 opens, the elec-
6
trode may stick to the workpiece more
frequently during low voltage (short arc
length) conditions. CB4 automatically
resets when the fault is corrected. If
CB4 continues to open, check trans-
former T1, and integrated rectifiers
SR4 and SR5.
CB5 protects the 24 volt ac output to
remote receptacle RC14, and 24 volt
output to field current regulator board
PC1. If CB5 opens, weld output and 24
volt output to RC14 stops. If CB5 con-
tinues to open, check remote controls
connected to RC14, and circuit board
PC6 (see Section 10-5).
CB10 protects the engine battery cir-
cuit. If CB10 opens, the engine will not
crank. CB10 automatically resets
when the fault is corrected. If CB10
continues to open, check fuel solenoid
FS1. Also check for wire(s) shorted to
ground.
CB11 protects the control box wiring
harness. If CB11 opens, weld output
stops (auxiliary power is still avail-
able). If CB11 continues to open,
check field current regulator board
PC1, and also verify wire 113 is not
shorted to ground (see Section 10-7).
CB12 protects the field flashing circuit.
If CB12 opens, the generator may not
excite at start-up and weld and auxilia-
ry power output may not be available.
If CB12 continues to open, check field
current regulator board PC1 (see Sec-
tion 10-7).
CB13 protects the 115 volt ac output to
remote receptacle RC14. If CB13
opens, 115 volt output to RC14 stops.
If CB13 continues to open, check re-
mote controls connected to RC14, and
circuit board PC6 (see Section 10-5).
Press button to reset breaker.
803 123-A / 802 170-D / Ref. 802 313
TM-4412 Page 29