Voltmeter/Ammeter Help Displays - Miller Big Blue 800 DUO PRO Owner's Manual

8-9. Voltmeter/Ammeter Help Displays

Use the Voltmeter/Ammeter help displays
to diagnose and correct fault conditions.
.
When a help code is displayed normal-
ly weld output has stopped but genera-
tor power output may be okay.
.
To reset help displays, stop unit and
then restart. See item 4 below to reset
Help 25 display.
1 Help 20 Display
Indicates a failure of meter display module
PC2, or the wiring between PC2 and main
control module PC1, or PC1. If this display
is shown, have Factory Authorized Ser-
vice Agent check PC1, PC2, and the wiring
between PC1 and PC2.
2 Help 21 Display
Thermistor TH1 in the IGBT module on the
heat sink has failed. If this display is
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Complete Parts List available at www.MillerWelds.com
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HL.P
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shown, have Factory Authorized Service
Agent check TH1, and the wiring between
TH1 and PC1.
3 Help 22 Display
Indicates the IBGT module heat sink has
overheated. If this display is shown, check
generator cooling system and/or reduce
duty cycle. Keep engine access door
closed when running to maintain proper
cooling air flow past the heat sink. Allow
unit to cool before restarting. If problem
continues, have Factory Authorized Ser-
vice Agent check unit.
4 Help 25 Display
Indicates a remote device connected to
Remote Receptacle RC14 may be faulty.
Help 25 is also displayed whenever a re-
mote device has been connected to RC14
and then disconnected. Clear fault by stop-
20
21
22
25
26
ping and restarting the unit or by turning
Process/Contactor switch to another posi-
tion. If problem continues, have Factory
Authorized Service Agent check the re-
mote device, filter board PC6, and main
control module PC1.
5 Help 26 Display
Indicates a fault when attempting to oper-
ate the unit in single operator mode (out-
puts internally paralleled). Help 26 indic-
ates a failure of either side A or side B or
the communications between them which
prevents the unit from being operated in
the single operator mode. Return to dual
operator mode and check for output at both
sides. If output is normal, contact Factory
Authorized Service Agent to check internal
wiring and communications between
sides.