Miller Electric Big Blue 602P manual Engine Starting Controls, To Start, Engine Indicator Lights

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

Engine Starting Controls

1 Magnetic Shutdown Switch

Use switch during start-up to bypass engine shutdown system. System stops engine if oil pressure or fuel level is too low or coolant tem- perature is too high.

2 Starting Aid Switch

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

3 Engine Control Switch

Use switch to start engine, select engine speed ( if unit has auto idle option), and stop engine.

In Run position, engine runs at weld/power speed. In Run/Idle position (optional), engine runs at idle speed at no load and weld speed with load applied.

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 while pressing Shutdown switch. Release Engine Control switch when engine starts. Continue holding Shutdown switch until engine indicator lights go out.

Below 325 F (05 C): turn engine control switch to Run/Idle position. Push Starting Aid switch up for 60 seconds. While still holding Starting Aid switch, press Magnetic Shutdown switch and turn Engine Control switch to Start. Re- lease Engine Control switch and Starting Aid switch when engine starts. Continue holding Shutdown switch until engine indicator lights go out.

To Stop: turn Engine Control switch to Off position.

Engine Indicator Lights

4 Battery Charging Light

Light goes on if engine alternator is not charg- ing battery. Engine continues to run.

YStop engine and fix trouble if Battery Charging light goes on.

5 Engine Temperature Light

Light goes on and engine stops if engine tem- perature is above 221 ° F (105° C).

YStop engine and fix trouble if Engine Temperature light goes on.

6 Engine Oil Pressure Light

Light goes on and engine stops if oil pressure is below 10 psi (69 kPa). Light goes on mo-

mentarily during start-up but goes out when engine reaches normal oil pressure.

YStop engine and fix trouble if Engine Oil Pressure light stays on after start- up.

7 Fuel Light

Light goes on and engine stops if fuel level is low. Add fuel to resume operation.

8Engine Hour Meter

Engine Gauges

.To read gauges and engine indicator lights with engine off, turn Engine Control switch to Run/Idle and press Magnetic Shutdown switch (see Section 9-8).

9 Fuel Gauge

Use gauge to check fuel level.

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

10 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.

11Engine Coolant Temperature Gauge (Optional)

Normal temperature is 180 - 203° F (82 - 95° C). When equipped with gauge option, engine stops if temperature exceeds 220° F (104° C).

12 Engine Oil Pressure Gauge (Optional)

Normal pressure is 30 − 60 psi (207 − 414 kPa). When equipped with gauge option, en- gine 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 15).

13 Ampere Range Switch

YDo 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.

14 Amperage Adjust Control

Control adjusts amperage within range se- lected by Ampere Range switch. Weld output would be about 223 A DC with controls set as shown (50% of 125 to 320 A).

.The numbers around the control are for reference only and do not represent an actual percentage value.

15 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.

16Amperage Adjust Switch And Remote Amperage Adjust Receptacle

Connect optional remote control to RC13 (See Section 5-10). 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 5-10and 6-3).

17Polarity Switch (Optional)

Y 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

18 DC Voltmeter (Optional)

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

19 DC Ammeter (Optional)

Ammeter displays amperage output of the unit.

OM-491 Page 24 Return To Table Of Contents