Miller Electric RPC-IP manual ± Operator Controls, Mode Selector Switch Figure

Mounting

Screws (5)

Front

Panel

Dip

Switch

Cover

Circuit	Both dip switches down for
Board	1000 ampere model operation
PC5	Both dip switches up for
	650 ampere model operation

ST-113 509-A

Figure 2-2. Dip Switch Positions And Locations

SECTION 3 ± OPERATOR CONTROLS

3-1. MODE SELECTOR SWITCH (Figure 3-1)

The Mode Selector switch allows selection of CC (constant current), CV (constant voltage), or pulsed out- put from the welding power source.

The CC position provides a constant current output spe- cifically designed for Shielded Metal Arc (SMAW) and Gas Tungsten Arc (GTAW) Welding processes. The CC position is also normally used for Air Carbon Arc Cutting (CAC-A) and gouging processes.

The CV position provides a constant voltage output de- signed for wire feeding applications such as Gas Metal Arc (GMAW), Flux Cored Arc (FCAW), or Submerged Arc (SAW) Welding.

When pulsed output is desired for Gas Metal Arc Weld- ing - Pulsed Arc (GMAW-P), place switch at the desired number of pulses per second: 60, 90, 120 or 180.

3-2. ARC CONTROL AND PILOT LIGHT (Figure 3-1)

IMPORTANT: The ARC CONTROL potentiometer and pilot light are disabled in the CV (Constant Voltage) and pulsed modes.

The ARC CONTROL potentiometer provides variable selection of short-circuit current to suit individual weld- ing conditions. Rotating this control clockwise causes the current to increase as the short-circuit condition is

approached. When this control is set at some value above 0, the current begins to increase when arc volt- age drops below 20 volts.

When the control is set at 10 (MAX.), the short-circuit current is considerably higher than normal welding cur- rent (see welding power source volt-ampere curve for

CCmode). This provides extra current for arc starting in out-of-position welds as well as for certain types of elec- trodes.

When the control is set at 0 (SOFT), short-circuit current is the same as normal welding current. The 0 position provides current characteristics associated with the Gas Tungsten Arc Welding (GTAW) process.

When the control is set at 5, short-circuit current is approximately half that of the 10 (MAX.) position but still higher than normal welding current. The 5 position pro- vides a moderate current increase for arc starting nec- essary for certain types of electrodes and applications.

Select a setting best suited for the application.

The Arc Control pilot light turns on when the Mode Se- lector switch is in the CC position indicating that the ARC CONTROL is active.

IMPORTANT: The ARC CONTROL can be adjusted while welding.

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