Lincoln Electric SVM123-A service manual Control Transformer Test

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F-4	TROUBLESHOOTING & REPAIR					F-4
	Observe all Safety Guidelines detailed throughout this manual
PROBLEMS			POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)			MISADJUSTMENT(S)		COURSE OF ACTION
			OUTPUT PROBLEMS
Major Physical or	Electrical	Contact the Lincoln Electric
Damage is Evident.			Service Dept. (216) 383-2531
			or 1-800-833-9353 (WELD)
The Machine is dead - The Input		1. Check for blown or missing		1.	The.Start/Stop button (S1)
contactor does not	operate.		fuses in input lines.		may be faulty- Check for prop-
					er operation. See wiring dia-
		2.	Check the three-phase input		gram.
			line voltage at the machine.
			The input voltage must match	2.	The Control Transformer (T2)
			the rating plate and reconnect		may be faulty. Perform the
			panel.		Control Transformer Test.
				3.	The primary or secondary
					thermostats may be open.
					Check or replace. Also check
					the associated wiring. See
					wiring diagram.
				4.	The pilot relay (2CR) may be
					faulty. Check or replace. See
					wiring diagram.
				5.	The input contactor coil may
					be open. See wiring diagram.
				6.	The Control board may be
					faulty - Replace.
Input contactor (1CR) chatters.		1.	The input line voltage may be	1.	The pilot relay (2CR) may
			low. Check all three phases.		have bad contacts. Check or
					replace relay.
		2. Make sure input line voltage
			matches machine rating and	2.	Check for loose or faulty
			reconnect panel.		wiring between pilot relay
					(2CR) and input contactor
					(1CR)	coil connections.
				3.	The input contactor (1CR)
					may be	faulty - Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.

IDEALARC DC-1000