Lincoln Electric SVM172-A service manual Function Problems

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

F-5 TROUBLESHOOTING & REPAIR F-5

POWER FEED 10M

Observe Safety Guidelines detailed in the beginning of this manual.

PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)		COURSE OF ACTION
FUNCTION PROBLEMS (Continued)
The purge switch on the wire drive	1. Make certain the COLD		1. If the COLD INCH/GAS PURGE
unit does not activate the gas sole-	INCH/GAS PURGE switch is		switch is operating correctly and
noid, but gun trigger closure in the	operating properly.		the associated leeds are OK.
MIG or pulse modes does activate			The feedhad board may be
the solenoid. The LEDs are	2. Check for loose or faulty leeds		faulty.
steady green on the power source,	between COLD INCH/GAS
Control Box and wire drive unit.	PURGE switch and the wire
	drive control board. See wiring
	diagram.
The COLD INCH/GAS PURGE	1. Make certain the COLD		1. If the COLD INCH/GAS PURGE
switch does not turn on the wire	INCH/GAS PURGE switch is		switch is operating correctly and
drive motor but gun trigger closure	operating properly.		the associated leads are OK.
in the MIG or Pulse modes does			The feedhead board may be
activate the wire drive motor.	2. Check for loose or faulty leeds		faulty.
The LEDs are steady green on the	between the COLD INCH/GAS
power source, Control Box and	PURGE switch and the wire
wire drive unit.	drive control board. See wiring
	diagram.
The voltmeter on the Control Box	1. Make sure the DIP switches are		1. Check leads #513 and #514 from
does not function properly even	configured correctly for the weld-		J85 on the feedhead board to the
though the STATUS LEDS are	ing polarity being used.	See	voltage sense PC board.
steady green.	Setting Dip Switches in the
	Wire Drive in the Installation
	section of this manual.		2. Perform the Voltage Sense
			Board Test.
	2. Check the #67 lead on the wire		3. The display board may be faulty.
	drive unit. Make sure it is con-
	nected to the motor gear box and		4. The feedhead control board may
	also the voltage sense PC board.
			be faulty.
	3.Check the work sensing leads on		5. The Control Box control board
	the Power Wave 455	power
			may be faulty.
	source. Check leads #202 (Neg.
	output terminal) and #206 (pos.
	output terminal). See Power
	Wave 455 wiring diagram. If
	esternal voltage sensing is uti-
	lized, Check the #21 lead
	between the 4-pin receptacle on
	the front of the Power Wave 455
	and the workplace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department at 1-888-935-3877 for electrical troubleshooting assistance before you proceed.

POWER FEED 10M SINGLE/DUAL