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B-5

B-5

OPERATION

8.POLARITY SWITCH (optional): Permits chang- ing the electrode polarity of the output terminals between DC+ and DC-.

9.DC AMMETER (optional): Displays output cur- rent when welding.

10.DC VOLTMETER (optional): Displays output voltage.

11.THERMAL PROTECTION INDICATOR LIGHT: This amber light indicates that either of the two protective thermostats has opened. Output power is removed, but input power is still being applied to the machine.

IDEALARC R3R

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Lincoln Electric R3R-500, R3R-300 service manual Operation