Fan/snubber board led chart, The thermal fan/snubber pc board led chart, Troubleshooting & repair – Lincoln Electric IDEALARC DC-655 User Manual
Page 83: Thermal fan/snubber board led chart
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TROUBLESHOOTING & REPAIR
F-41
F-41
IDEALARC DC-655
THERMAL FAN/SNUBBER BOARD LED CHART
LED #
LED FUNCTIONS AND INDICATIONS
(Machine is ON)
1
Indicates fan should be running.
2
Indicates welding current is greater than 200 amps.
3
Indicates fan should be running due to heating of main
SCRs.
4
Indicates an open thermal fan thermistor or an open con-
nection between the thermistor and the thermal fan/snub-
ber board. See the Wiring Diagram (leads #319 and
#316).
5
Indicates a thermostat (choke or secondary) has opened.
The thermal protection light should also be illuminated.
6
Indicates the fan motor should be running. LED 6 should
be illuminated and the fan running when any
of the following LEDs are lit: LED 2, LED 3, LED 4, or
LED 5.
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