B-6

OPERATION

B-6

17. 120VAC RECEPTACLES
These two 120VAC (5-20R) receptacles provide
120VAC for auxiliary power.Each receptacle has a 20
amp total rating. Refer to the AUXILIARY POWER
RECEPTACLES section in the installation chapter for
further information about these receptacles. Also refer
to the AUXILIARY POWER OPERATION section later
in this chapter.
18. 20 AMP CIRCUIT BREAKERS
These circuit breakers provide separate overload cur-
rent protection for each 120V receptacle.
19. GROUND STUD
Provides a connection point for connecting the
machine case to earth ground for the safest grounding
procedure. Refer to “MACHINE GROUNDING”in the
Installation chapter for proper machine grounding infor-
mation.
21. 15 AMP CIRCUIT BREAKER
This circuit breaker provides overload protection for the
120 VAC in the 14-pin connector.
22.VOLTMETER +/- SWITCH
Changes the polarity display on the wire feeder.
23. 20 AMP CIRCUIT BREAKER (Optional)
This circuit breaker provides overload protection for the
42 VAC in the 14-pin connector.
24. 14 - PIN CONNECTOR
For quick connection of interfacing equipment.
25. ARC CONTROL
The “ARC CONTROL”potentiometer is active in two
modes:“STICK / CC “ and “WIRE WELDING”with dif-
ferent purposes in each mode.
“STICK / CC”mode: In this mode, the “ARC CON-
TROL”knob sets the short circuit current during stick
welding.Increasing the number from 1 to 10 increases
the short circuit current. This prevents sticking of the
electrode to the plate at low welding current settings.
This also increases spatter.It is recommended that the
control be set to the minimum number without elec-
trode sticking.
“WIRE WELDING”mode: In this mode increasing the
number from 1 to 10 changes the arc from soft and
washed in to crisp and narrow.It acts as an inductance
control.The proper setting depends on the application
and operator preference.
In general, Mig welding performs best in the “SOFT”
range and Innershield in the “CRISP”range.
ENGINE OPERATION

STARTING THE ENGINE

1. Open the engine compartment door and check that
the fuel shutoff valve located to the left of the fuel fil-
ter housing is in the open position (lever to be in line
with the hose).
2. Check for proper oil level on the oil dipstick. Close
engine compartment door.
3. Remove all plugs connected to the AC power receptacles.
4. Set IDLER switch to “AUTO”.
5. Set the RUN/STOP switch to “RUN”. Obser ve that all
engine protection lights momentarily turn on, some lights
may turn off before starting. Check the fuel gauge
(K1639-2 only)
to make sure that there is an adequate
fuel level.
6. Press and hold the engine START button for a minimum
of 2 seconds.
7. Release the engine START button when the engine starts.
8.
Check that the indicator lights are off. If the LOW FUEL light is
on (K1639-2 only) , the engine will shutdown 30 minutes after
starting. If any other indicator light is on after starting, the
engine will shutdown in a few seconds. Investigate any indi-
cated problem.
9. Allow the engine to warm up at low idle speed for several
minutes before applying a load and/or switching to high
idle. Allow a longer warm up time in cold weather.
COLD WEATHER STARTING
With a fully charged battery and the proper weight oil,
the engine should start satisfactorily even down to
about 0°F. If the engine must be frequently started
below 10°F, it may be desirable to install the optional
ether starter kit (K825-1). Installation and operating
instructions are included in the kit.

STOPPING THE ENGINE

1. Switch the RUN/STOP switch to “STOP”.This tur ns
off the voltage supplied to the shutdown solenoid. A
backup shutdown can be accomplished by shutting
off the fuel valve located on the fuel line.
COMMANDER 500