Red-D-Arc D502K 5+4, Technical Manual

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TM-4412 Page 49 D502K 5+4
10-10. Diagnostic LED’s On LED Board PC9
PC9 Voltage Readings
a) Tolerance –
±
10% unless
specified
b) Reference – to circuit common
(lead 42) unless noted
c) Condition – no load; weld/power
rpm unless noted
d) Process/Contactor Control switch
S6 in Weld Terminals Always On –
CC Stick position
.
Do not exceed recommended voltage
when testing LED’s or circuit board may be
damaged.
Receptacle Pin Value
PLG13 1 Power LED, +2 volts dc input
To test power LED, apply +2 volts dc to PLG13-1 and connect negative (–) side of power supply to
PLG13-8. LED lights if okay.
2 Not used
3 Not used
4 Not used
5 AC input LED, +1.85 volts dc input with respect to pin PLG13-10 when weld exciter voltage is
present.
To test ac input LED, apply +1.85 volts dc to PLG13-10 and connect negative (–) side of power sup-
ply to PLG13-5. LED lights if okay.
6 Output on/off LED, 0.13 volts dc input with contactor off; + 2 volts dc input with contactor on.
To test output on/off LED, apply +2 volts dc to PLG13-6 and connect negative (–) side of power sup-
ply to PLG13-8. LED lights if okay.
7 Command LED, 0 to 2 volts dc input from min to max of Voltage/Amperage Adjust control R1.
To test command LED, apply +2 volts dc to PLG13-7 and connect negative (–) side of power supply
to PLG13-8. LED lights if okay.
8 Circuit common
9 RPM Limit LED, +10.5 volts dc input at 1850 rpm; voltage decreases as engine speed decreases.
LED goes on when engine speed is less than 1704 rpm (approximately).
To test rpm limit LED, apply +2 volts dc to PLG13-8 and connect negative (–) side of power supply to
PLG13-9. LED lights if okay.
10 AC Input LED, +1.85 volts dc input with respect to pin PLG13-5 when weld exciter voltage is present.
To test ac input LED, apply +1.85 volts dc to PLG13-10 and connect negative (–) side of power sup-
ply to PLG13-5. LED lights if okay.