Lincoln Electric IM644-A manual Engine Operation, Starting the Engine, Stopping the Engine

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”. Observe 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 turns 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