Miller Electric wire feeder Operator Controls, Pilot Lights Figure, Amperage Load Switches Figure

SECTION 5 – OPERATOR CONTROLS

Hertz Meter	Pilot Light For
	240VAC Load

AC Voltmeter

Pilot Light For

120VAC Load

Load Selector	Dual Scale
Switch
	AC Ammeter
120/240VAC
Amperage Load	Front Access Panel
Switches

Cord Storage

Area ST-108 014-A

Figure 5-1. Front Panel Controls And Component Locations

5-1. 120 VOLT LOAD/240 VOLT LOAD SELECTOR SWITCH (Figure 5-1)

CAUTION: ARCING can damage switch con- tacts.

•Do not change the position of the selector switch under load.

Arcing causes the contacts to become pitted and eventually inoperative.

The 120 VOLT LOAD/240 VOLT LOAD selector switch is used to select the proper voltage load terminals inside the unit, and to disconnect and isolate the other voltage load terminals. Before making selection with selector switch, be sure that the AMPERAGE load switches are placed in the OFF positions (see Section 5-3).

5-2. PILOT LIGHTS (Figure 5-1)

Two pilot lights are provided on the unit. The pilot light for the corresponding voltage load will illuminate when input voltage is present at the Load Bank.

5-3. AMPERAGE LOAD SWITCHES (Figure 5-1)

CAUTION: INCORRECT SWITCH POSI- TIONS can damage internal components.

•When operating on 240 volts, set amperage switches at same position or within one posi- tion of another.

A balanced load setting at both amperage load switches is necessary to prevent resistor damage inside the unit.

IMPORTANT: Always place both AMPERAGE load switches in the OFF position before connecting a power source, when changing the 120 VOLT LOAD/240 VOLT LOAD selector switch position, and after completing power source output checking procedures.

		AMPERAGE
		OFF	5
		OFF
			5	10
				10
45	45	+		15	15
40	40			20	20

3525

30

35	25
	30

Ref. SC-096 625

Figure 5-2. Amperage Load Switch Scales

Two AMPERAGE load switches provide the selection of resistance values when checking output from an ac power source. The scales around each switch are cali- brated in amperes with the inside scale for 120 vac input and the outside scale for 240 vac input (see Figure 5-2).

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