Lincoln Electric IM746 manual Problems Possible Areas Recommended Symptoms

E-5	TROUBLESHOOTING	E-5
	Observe all Safety Guidelines detailed throughout this manual

TROUBLESHOOTING GUIDE

Observe Safety Guidelines detailed in the beginning of this manual.

PROBLEMS	POSSIBLE AREAS OF				RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)				COURSE OF ACTION
	OUTPUT PROBLEMS
Thermal LED is lit.	1. Fan thermostat has opened.
	Check for proper fan operation.
	(Fan should run whenever out-
	put power is on.) Check for
	material blocking intake or
	exhaust louvers, or for excessive
	dirt clogging cooling channels in
	machine. Blow air in rear louvers
	to remove dirt around the fan.
	2. Secondary rectifier or Choke
	thermostat has opened. After
	machine has cooled, reduce
	load, duty cycle, or both. Check
	for material blocking intake or
	exhaust louvers.
	3. DC Bus PC board thermostat
	has opened check for excessive
	load on 40VDC supply.
Machine won’t weld, can’t get any	1. Input voltage is too low or too				If all recommended possible areas
output.	high. Make certain that input
	voltage is proper, according to				of misadjustments have been
	the Rating Plate located on the				checked and the problem persists,
	rear of the machine.				contact your local Lincoln
	2. If the Thermal LED is also lit,				Authorized Field Service Facility.
	see “Yellow Thermal LED is Lit”
	section.
	3. Primary current limit has been
	exceeded. Possible short in out-
	put circuit. Turn machine off.
	Remove all loads from the out-
	put of the machine. Turn back
	on. If condition persists, turn
	power off, and contact an autho-
	rized	Lincoln	Electric	Field
	Service facility.
	4. This problem will normally be
	accompanied by an error code.
	Error codes are displayed as a
	series of red and green flashes by
	the	status	light.	See
	"Troubleshooting the Power Wave

/Power Feed System Using the Status LED" section of this text.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con- tact your local authorized Lincoln Electric Field Service Facility for technical assistance.

POWER WAVE 405