Miller S-75DC Benutzerhandbuch - Seite 29

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7-4. Troubleshooting

Trouble

Wire feeds, shielding gas flows, but

electrode wire is not energized.

Wire feeder is on, display does not light

up, motor does not run, gas valve and

welding power source contactor do not

pull in.

Electrode wire feeding stops or feeds

erratically during welding

erratically during welding.

Motor runs slowly.

Wire feeder power is on, displays light

up, feeder jogs, purges, but unit is in-

operative.

When triggered wire feeds but no gas,

no contactor.

Y Disconnect power before troubleshooting

Check cable connections. Check cables for continuity, and repair or replace cables if necessary

(see Section 5-3).

Check and reset circuit breaker at welding power source.

Check gun trigger connection. See gun Owner's Manual.

Check gun trigger. See gun Owner's Manual.

Readjust hub tension and drive roll pressure (see Section 5-11).

Change to correct size drive roll (see Section 5-7 and Table 9-1).

Clean or replace dirty or worn drive roll.

Incorrect size or worn wire guides.

Replace contact tip or liner. See gun Owner's Manual.

Remove weld spatter or foreign matter from around nozzle opening.

Check brushes in drive motor. If brush length is less than 1/4 inch, replace brushes.

Have Factory Authorized Service Agency check drive motor or motor control board PC1.

Check for correct input voltage.

Check welding gun trigger leads for continuity, and repair leads or replace gun.

If the welding arc does not establish in 3 seconds after the gun trigger is activated the unit will feed

wire, but turns off contactor and gas valve. If the gun trigger is still activated after two minutes, the

wire will stop feeding.

Remedy

OM-223 605 Page 25