Miller 20 Series Manuale d'uso - Pagina 26

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7-2. Overload Protection

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; wire feeds.

OM-281138 Page 22

Turn Power switch On.

Check 14−pin plug PLG2 connections.

Check input power.

Check supplementary protector CB1. (see Section 7-2)

Check gun trigger connection at wire feeder. Check gun trigger leads and trigger switch. See gun Owner's

Manual.

Run-In speed is set to minimum. Normal setting is 50 percent.

Have Factory Authorized Service Agent check drive motor and control board PC1.

Readjust hub tension and drive roll pressure (see Section 5-9).

Use correct size drive roll (see Parts List).

Clean or replace dirty or worn drive roll (see Section 5-8).

Remove weld spatter around nozzle opening.

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

Have Factory Authorized Service Agent check drive motor and control board PC1.

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 gas valve and flowmeter.

Turn Off wire feeder and

welding power source. Stop

engine on welding generator.

Supplementary Protector CB1

CB1 protects wire feeder from over-

load.

Correct problem and manually reset

supplementary protector.

Remedy

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