Lincoln Electric 405M, 355M service manual Transformer Test, Wfs

POWER WAVE 355M/405M

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F-8	TROUBLESHOOTING AND REPAIR					F-8
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS			POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)			MISADJUSTMENT(S)		COURSE OF ACTION
			FUNCTION PROBLEMS		1. Perform the Auxiliary
Auxiliary receptacle is “dead” no		1.	Circuit breaker CB1 (on case
auxiliary voltage.			front) may have opened. Reset.		Transformer Test.
		2.	Circuit breaker CB3 (in recon-
			nect area) may have opened.
			Reset.
		3.	On PW 405 models, the circuit
			breaker	CB4 protects the
			220VAC	receptacle. Reset if
			tripped.
A fault or error code is displayed.		1. See Fault Code Explanations.			1. See Fault Code Explanations.

General degradation of the weld 1.	Check for feeding		problems,	1.	Perform the Voltage and
performance.	bad	connections,	excessive		Current Calibration Procedure
	loops in cabling, etc.				using the Power Wave software
					program.
2.	Verify weld mode is correct for
	processes.			2.	Perform the Current
					Transducer Test.
3.	The power source may require
	calibration.			2.	Perform the Output Diode
					Module Test.
4.	Check the actual current dis-
	played on the Power Feed 10			5.	The control board may be
	vs. actual current measured via				faulty.
	external meter.
5.	Check the actual voltage dis-
	played on the Power Feed 10
	vs. actual voltage measured via
	external meter.
6.	Check the actual WFS displayed
	on the Power Feed 10 vs. actual
	WFS	measured via external
	meter.

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 1-888-935-3877.