Miller Electric 500D Engine Starting Controls, To Start, Engine Gauges And Meters, Weld Controls

6-2. Description Of Front Panel Controls For CC Models (See Section 6-1)

Engine Starting Controls

1 Starting Aid Switch

Use switch to energize starting aid for cold weather starting (see starting instructions fol- lowing).

2 Engine Control Switch

Use switch to start and stop engine.

To Start:

NOTICE − Do not use ether. Using ether voids warranty.

.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): push Starting Aid switch up for 60 seconds. 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 Gauges And Meters

3 Engine Hour Meter

Use hour meter to monitor engine run time to help schedule maintenance.

4 Fuel Gauge

Use gauge to check fuel level.

To check fuel level when engine is not run- ning, turn Engine Control switch to Run posi- tion.

5 Battery Voltmeter (Optional)

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.

6 Engine Coolant Temperature Gauge

Normal temperature is 180 - 203° F (82 - 95° C). Engine stops if temperature exceeds 220° F (104° C).

7 Engine Oil Pressure Gauge

Normal pressure is 30 − 60 psi (207 − 414 kPa). Engine stops if pressure is below 10 psi (69 kPa).

Weld Controls

.Max OCV Control Circuit: This unit has

a max OCV control circuit that resets Am- perage Adjust control R1 to maximum when the arc breaks. When an arc is struck, weld output control returns to the R1 front panel or combination front panel/ remote control setting. The Amperage Adjust control adjusts amperage only when welding and does not adjust open- circuit voltage.

The max OCV circuit is disabled when the Stick/TIG Selection switch is in Scratch Start TIG position (see item 10).

8Ampere Range Switch NOTICE − Do not switch under load.

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

9 Amperage Adjust Control

Control adjusts amperage within range se- lected by Ampere Range switch. Weld output would be about 180 A DC with controls set as shown (50% of 150 to 330 A).

.The numbers around the control are for

reference only and do not represent an actual percentage value.

10 Stick/TIG Selection Switch

Use switch to disable the max OCV circuit and the arc drive (dig) circuit for scratch start TIG welding (see max OCV note under Weld Controls).

When switch is in the Stick position, the max OCV circuit resets Amperage Adjust Control R1 to maximum when the arc breaks.

Also in the Stick position, the arc drive (dig) circuit provides additional amperage during low voltage (short arc length conditions) to prevent “sticking” electrodes.

When switch is in Scratch Start TIG position, the max OCV and arc drive (dig) circuits are disabled and OCV changes when the control is adjusted.

11Amperage Adjust Switch And Remote Amperage Adjust Receptacle

Connect optional remote control to RC13 (See Section 5-11). Use switch to select front panel or remote amperage control. For re- mote control, place switch in Remote position and connect remote control to Remote Am- perage Adjust receptacle RC13 (see Sec- tions 5-11and 6-3).

12Polarity Switch (Optional) NOTICE − Do not switch under load.

Use switch to change weld output. Select ei- ther DC Electrode Positive (DCEP) or DC Electrode Negative (DCEN).

Weld Meters

13 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.

14 AC/DC Ammeter (Optional)

Ammeter displays amperage output of the unit.

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