Miller Electric Auto-Axcess 450 manual Troubleshooting, Trouble Remedy

7-13. Troubleshooting

	Trouble	Remedy
No weld output; completely inoperative		Place line disconnect in On position (see Section 3-13).
		Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 3-13).
		Check for proper input power connections (see Section 3-13).
No weld output; meter display on with no		Check to see if the contactor indicator light is lit when contactor line is asserted on.
error displayed.
Erratic or improper weld output with no		Use proper size and type of weld cable (see Section 3-9).
errors displayed.
		Check that proper program for wire size, process, and shielding gas is loaded.
		Clean and tighten all weld connections.
No 115 volts AC at the duplex receptacle.		Reset supplementary protector CB1 (see Section 3-7).
Wire does not feed.		Check supplementary protector CB2 and reset if necessary (see Section 3-7).
		Check motor control cable connections.
Wire feeds erratically.		Readjust hub tension.
		Readjust drive roll pressure.
		Clean or replace dirty or worn drive rolls.
		Remove weld spatter around the nozzle opening.
		Replace contact tip or liner. See gun Owner’s Manual.
		Check motor control cable connections.
Wire feeds as soon as power is supplied.		Check gun trigger. See gun Owner’s Manual.
Wire stubbing on low end using a		Increase output setting of the power source.
constant current power source.
		Check voltage sense lead connection, clean and tighten if necessary.
Gas does not flow or does not stop flow-		Check gas valve and flow meter.
ing; wire feeds.
Wire burns back to gun contact tip when		Check to be sure that volt sense lead is connected to the work.
using electrode negative (straight
polarity) process.

OM-210 540 Page 46