Troubleshooting - Miller SuitCase 12RC Mode D'emploi

6-3. Troubleshooting

Trouble
Wire does not feed, unit completely inop-
erative.
Wire does not feed.
Wire feeds erratically.
Wire feeds when Jog switch is pressed
but not when gun trigger is pressed.
Wire feeds as soon as power is applied. Check gun trigger. See gun Owner's Manual.
Wire does not feed until trigger is
pressed but continues to feed after trig-
ger is released.
Gas valve rattles loudly and wire feeds
slowly or erratically.
Gas does not flow or does not stop flow-
ing; wire feeds.
Motor runs slowly.
When triggered; gas flows, wire feeds
but no contact closure at welding power
source.
Turn Power switch On.
Check 14−pin plug PLG2 connections.
Check input power.
Check circuit breaker CB1. (see Section 6-2).
Check gun trigger connection at wire feeder. Check gun trigger leads and trigger switch. See gun Owner's
Manual.
Have Factory Authorized Service Agent check drive motor and control board PC1.
Readjust hub tension.
Readjust drive roll pressure.
Clean or replace dirty or worn drive roll (see Section 4-5).
Remove weld spatter around nozzle opening.
Replace contact tip or liner. See gun Owner's Manual.
Change to correct size and type drive roll (see Section 4-5)
Incorrect size or worn wire guides (see Section 4-5)
Have Factory Authorized Service Agent check control board PC1.
Hub tension set too high (see Section 4-10).
Check gun trigger connection at wire feeder. Check gun trigger leads and trigger switch. See gun Owner's
Manual.
Check for short between gun trigger leads and weld cable. Repair or replace gun trigger leads.
Check for short between gun trigger leads and weld cable. Repair or replace gun trigger leads.
Check gas valve.
Check coil voltage and connections of gas valve GS1. Check continuity of coil. Replace GS1 if necessary.
Have Factory Authorized Service Agent check Control board PC1.
Clear blockage in gas hose or replace hose.
Clear blockage in welding gun.
Check and replace contact tip or liner if necessary.
Have Factory Authorized Service Agent check Control board PC1.
Hub tension set too high (see Section 4-10).
Overheating of bus bar. Allow feeder to cool, reduce weld amperage or duty cycle.
Remedy
OM-1500-15 Page 23