Miller Electric OM-4409 manual Description Of Controls See Section

6-2. Description Of Controls (See Section 6-1)

Engine Starting Controls

1 Starting Aid Switch

Use switch to energize starting aid for cold weather starting.

Push switch up for 60 seconds to operate the starting aid (intake air heater) before cranking engine (see starting instructions following).

2 Engine Control Switch

Use switch to start engine, select engine speed, and stop engine.

In Run position, engine runs at weld/power speed. In Run/Idle position, engine runs at idle speed with no generator power or weld load, and weld/power speed with load ap- plied.

The air compressor load does not affect en- gine speed. Run engine at weld/power speed for maximum air compressor output.

To Start:

.If engine does not start, let engine come

to a complete stop before attempting re- start.

Above 325 F (05 C): turn Engine Control switch to Start. Release Engine Control switch when engine starts.

Below 325 F (05 C) using starting aid switch:

Turn Engine Control switch to Run/Idle posi- tion. Push Starting Aid switch up for 60 sec- onds. While still holding Starting Aid switch, turn Engine Control switch to Start. Release Engine Control switch and Starting Aid switch when engine starts.

To Stop: turn Engine Control switch to Off position.

Engine/Compressor Gauges

3 Engine Hour Meter

Use gauge to monitor engine running time for scheduling maintenance.

4 Fuel Gauge

Use gauge to check fuel level. Engine stops if fuel level is low on units with low fuel shut- down option.

To check fuel level when engine is not run- ning, turn Engine Control switch to Run/Idle position.

5 Air Pressure Gauge

Use gauge to check compressor air pressure.

6 Engine Oil Pressure Gauge

Normal pressure is 30 − 60 psi (206 − 414 kPa). Engine stops if pressure is below 20 psi (138 kPa).

7 Engine Temperature Gauge

Normal temperature is 212 - 239° F (100 - 115° C). Engine stops if temperature exceeds 270° F (132° C).

8 Battery Voltmeter

Use gauge to check battery voltage and moni- tor the engine charging system. The meter should read about 14 volts dc when the en- gine is running, and about 12 volts dc when the engine is stopped.

9 Air Compressor Hour Meter (Optional)

Use gauge to monitor compressor running time for scheduling maintenance.

Weld Controls

10 Process/Contactor Switch

See Section 6-3for Process/Contactor switch information.

11Ampere Range Switch NOTICE − Do not switch under load.

Use switch to select weld amperage range.

Use all five ranges for Stick welding, and the lowest four ranges for TIG welding. Read the upper set of numbers at each range for Stick welding and the lower set at each range for TIG welding.

Use the highest range for MIG welding and for cutting and gouging (CAC-A).

For most welding applications, use lowest amperage range possible to help prevent arc outages.

12 Voltage/AmperageAdjust Control

With Process/Contactor switch in any Stick or TIG setting, use control to adjust amperage within range selected by Ampere Range switch. With Process/Contactor switch in any MIG position, use control to adjust voltage. With Panel/Remote Switch in Remote posi- tion, control limits the remote amperage in TIG mode, but has no effect in Stick and MIG modes.

Weld output would be about 263 A DC with controls set as shown (50% of 125 to 400 A).

.The numbers around the Voltage/Amper- age Adjust control are for reference only

and do not represent an actual percent- age value.

13Panel/Remote Switch And Remote 14 Receptacle

Use switch to select front panel or remote voltage/amperage control. For remote con- trol, place switch in Remote position and con- nect remote control to Remote 14 receptacle RC14 (see Sections 5-10and 6-4).

14Polarity/AC Selector Switch (Optional) Or Output Selector Switch (Optional)

NOTICE − Do not switch under load.

Use Polarity/AC selector switch to select AC or DC weld output and DC weld output po- larity.

Use Output Selector switch to select AC Weld, DC Weld, or battery charge output (see Section 8-1).

Weld Meters

15 AC/DC Voltmeter (Optional)

Voltmeter displays voltage at the weld output terminals, but not necessarily the welding arc due to resistance of cable and connections.

16 AC/DC Ammeter (Optional)

Ammeter displays amperage output of the unit.

Air Compressor Controls

17 Air Compressor Switch

Use switch to turn air compressor on and off. Air pressure is present at the compressor air shutoff valve whenever the compressor is running. The compressor shuts off when the engine stops. To use air, the compressor must be turned on each time the engine is started.

The air compressor will not start if still under pressure. If air compressor is turned off, wait for air pressure to bleed off (about 20 sec- onds) before turning air compressor on again.

.To extend clutch bearing life, cycle air

compressor off and on once every two hours during periods of extended use.

18 Air Shutoff Valve

! Air pressure is present at valve when- ever Air Pressure Gauge (item 5) indi- cates air pressure.

Close valve to stop air flow when connecting or changing tools or air hoses (see Section 5-11).

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