Hobart Welding Products POWERPAK OM-478 - Manual (Page 41)

OM-478 Page 37
8-7. Overload Protection
Ref. ST-184 780-F / Ref. ST-184 781-A / Ref. ST-153 653-A / ST-153 702-A
Y Stop engine.
.
If a circuit breaker or fuse
opens, it usually indicates a
more serious problem exists.
Contact a Factory Authorized
Service Agent.
1 Circuit Breaker CB3
CB3 protects the 115 volts ac out-
put to Remote 14 receptacle RC3 or
terminal strip 3T. If CB3 opens, the
115 volts ac output stops.
2 Circuit Breaker CB4
CB4 protects the 24 volts ac output
to Remote 14 receptacle RC3 or
terminal strip 3T. If CB4 opens, the
24 volts ac stops.
Press button to reset breaker.
3 Fuse F11 (See Parts List)
4 Throttle Solenoid
Fuse F11 protects throttle solenoid
from overload. If F11 opens, the en-
gine does not run at idle rpm.
Check F11 and replace if open.
Check movement of solenoid and
adjustment of weld speed throttle
link (see Section 8-6). If F11
continues to open, replace throttle
solenoid.
5 Magnetic Shutdown Switch
MS1
6 Fuse F (See Parts List)
7 Fuse F6 (See Parts List)
Remove screw to open upper front
panel access door.
Fuse F protects the magnetic shut-
down switch MS1 from damage due
to overload. If F opens, the engine
stops. Do not run engine until
problem is corrected.
Check fuse, and replace if open.
Fuse F6 protects the excitation cir-
cuit from damage due to overload.
If F6 opens, there will be low/no
weld and auxiliary power output.
Check fuse, and replace if open.
Tools Needed:
3
4
5
6
1
2
7