Ammeter Switch Figure | Miller Electric RPC-IP manual

Voltmeter

Ammeter

Volts/Peak

Control And

Pilot Light

Mode

Selector

Switch

Ammeter

Switch

Arc

Control

Arc Control

Pilot Light

Contactor

Switch

Amps/Bkgd

Control And

Pilot Light

ST-109 521-A

Figure 3-1. Front Panel View

3-3. CONTACTOR SWITCH (Figure 3-1)

WARNING: ELECTRIC SHOCK can kill.

• Do not touch live electrical parts.

•Do not touch the weld output terminals when the contactor is energized.

•Do not touch electrode holder (or gun wire) and work clamp at the same time.

If the Remote Control CONTACTOR switch is in the ON position, open-circuit voltage will be present at the out- put terminals whenever the welding power source POWER switch ON button is depressed.

IMPORTANT: Although the term CONTACTOR is used on the nameplate and throughout this manual, the weld output is not switched on or off by a physical secondary contactor; rather, the weld output is controlled by solid- state circuitry in the welding power source.

If contactor control by means of a wire feeder is desired, place the Remote Control CONTACTOR switch in the OFF position. Open-circuit voltage will be present at the weld output terminals whenever the gun switch is closed.

The OFF position is normally used with all wire feeding processes (GMAW, GMAW-P, FCAW, SAW) and the Gas Tungsten Arc Welding (GTAW) process. The ON position is normally used with the Shielded Metal Arc Welding (SMAW) and the Air Carbon Arc (CAC-A) Cut- ting and gouging processes.

Lift end of toggle switch to change switch positions.

OM-533 Page 4

3-4. AMMETER SWITCH (Figure 3-1)

The AMMETER switch provides selection of reading PEAK weld amperage or Average (AVG) weld amper- age on the Remote Control digital ammeter.

Normally the AVG switch position is used for reading weld amperage during Gas Metal Arc (GMAW), Flux Cored Arc (FCAW), Submerged Arc (SAW), Shielded Metal Arc (SMAW), Gas Tungsten Arc (GTAW) Welding and Air Carbon Arc (CAC-A) Cutting and gouging pro- cesses.

While welding using the Gas Metal Arc Welding - Pulsed Arc (GMAW-P) process, the AVG switch position is used when display of the average (background and peak) weld amperage is desired. The AMMETER switch can be placed in the PEAK position when display of peak weld amperage is desired.

3-5. AMPS/BKGD CONTROL AND PILOT LIGHT (Figure 3-1)

This control presets weld amperage for constant current applications and background amperage for GMAW-P applications.

When the Mode Selector switch is in the CC position or one of the pulses per second positions, the AMPS/ BKGD pilot light turns on.

This control is disabled when the Mode Selector switch is in the CV position.

Rotating the control clockwise increases amperage.

IMPORTANT: The AMPS/BKGD control can be ad- justed while welding.