Lincoln Electric IM924 manual If the Thermal LED is also lit, see

E-5	TROUBLESHOOTING			E-5
	Observe all Safety Guidelines detailed throughout 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 output
	power is on.) Check for material
	blocking intake or exhaust lou-
	vers, or for excessive dirt clog-
	ging	cooling	channels in
	machine.

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. (CR1 will not pull in.)	high. Make certain that input volt-
	age is proper, according to the						of misadjustments have been
	Rating Plate located on the rear						checked and the problem persists,
	of the machine.						contact your local Lincoln
	2. If the Thermal LED is also lit, see						Authorized Field Service Facility.
	“Yellow Thermal LED is Lit” sec-
	tion.
	3. Primary current limit has been
	exceeded. Possible short in out-
	put circuit. Turn machine off.
	Remove all loads from the output
	of the machine. Turn back on. If
	condition persists, turn power off,
	and	contact	an		authorized
	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 455M/STT (CE)