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SECTION 6 TROUBLESHOOTING
6.3 Fault Isolation
6.3.1 Fan Not Working
6.3.2 Torch Will Not Fire
Problem Possible Cause Action
Main Arc Transfers to the work with
a short “pop”, placing only a small
dimple in the workpiece.
Communication between plasma unit
and CNC or process controller is lost.
Check communication cable.
CNC or Process Controller removes
the start signal when the main arc
transfers to the work.
Make sure CNC or Process Controller is
sending start signal correctly.
Remote current values are not pres-
ent.
Check if correct current values are
sent down the CAN Bus.
Current value is too low. Increase current value.
Arc does not start. There is no arc at
the torch. Open circuit voltage is OK.
Open connection between the power
source positive output and the work.
Repair connection.
Pilot current and/or start current
should be increased for better starts
when using consumables for 100A or
higher (Refer to process data includ-
ed in torch manuals).
Increase pilot current. (Refer to pro-
cess data included in torch manuals).
Fault light is ON. Check Help Codes table.
Faulty PCB1 (control board). Replace PCB1 (control board).
Problem Possible Cause Action
Fan does not turn ON
This is normal when unit is in idle
mode for more than 5 minutes.
None
Broken or disconnected wire in fan
motor circuit.
Repair wire.
Faulty fan(s) Replace fans
Relay failed to close
Check relay connection and/or replace
relay.
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