Miller Electric 625 manual Troubleshooting Help Aids, Troubleshooting Power Source

8-4. Troubleshooting Help Aids

1 Stud Count LED

2 Ready LED

3 Output LED

1

2

3

			803 618-B
Front Panel	Ready LED Status	Possible Symptom	Remedy
Error Indication
Normal/None	On	No problem	N/A
HELP 1	Off	Malfunction in the primary power cir-	Contact a factory authorized service
		cuit.	agent.
HELP 2	Off	Malfunction in the thermal protections	Contact a factory authorized service
		circuitry.	agent.
HELP 3	Off	Unit has overheated.	Unit has shut down to allow the fan to
			cool it (See Section 3-2). Operation
			will continue when the unit has cooled.
HELP 4	Off	Trigger circuit is closed when unit was	Open trigger circuit and cycle power.
		powered on.
HELP 5	Off	The unit has sustained an Open Circuit	Cycle power. Apply a welding load. If
		Voltage for more than 10 seconds.	problem persists, contact a factory au-
			thorized service agent.
HELP 6	Off	Input voltage is either under/low volt-	Unit has automatically shut down. Op-
		age or high/over voltage.	eration will continue when input voltage
			is within an acceptable limit. Have an
			electrician check the input voltage.
		DC bus voltage imbalance.	If input voltage is correct, contact au-
			thorized factory service agent.

8-5. Troubleshooting - Power Source

	Trouble		Remedy
No weld output; unit completely inop-		Place line disconnect switch in On position (see Section 4-2).
erative.
		Check and replace line fuse, if necessary, or reset circuit breaker (see Section 4-2).
		Check for proper input power connections (see Section 4-2).
No weld output.		Input voltage outside acceptable range of variation (see Section 4-2).
		Unit overheated. Allow unit to cool with fan On (see Section 3-2).
Erratic or improper weld output.		Use proper size and type of weld cable (see Section 4-3).
		Clean and tighten all weld connections.
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