Lincoln Electric IDEALARC R3R-500 - Manual (Page 21)

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OPERATION
B-5 B-5
IDEALARC R3R
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.