Lincoln Electric SVM132-A service manual Figure F.6 GUN Terminal Jumper Locations, 1CR

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F-22 TROUBLESHOOTING AND REPAIR F-22

DRIVE MOTOR TEST (continued)

FIGURE F.6 – GUN TERMINAL JUMPER LOCATIONS

LN-8
RELAY	1CR
	RELAY

627

626
7	529	32A	524(A)	525(A)

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6.Locate leads #626 and #627 at the relay board.

7.If a variable voltage board is installed in the LN-8, make cer- tain the mode switch is in the CV position.

8.Apply 115VAC to the input recep- tacle at pins C and D.

9.With the gun trigger activated or the gun trigger terminals jumpered together, (see wiring diagram), check the motor armature volts at leads #541 (+) and #539 (-). Normal is 5 to 95VDC dependent upon the setting of the wire feed speed control.

10.With the LN-8 at idle (gun trigger NOT activated) check the motor field voltage at lead #626 and

#627. Normal is 115VDC. When the gun trigger is activated or the gun terminals jumpered together, Figure F.6, the field voltage polari- ty should reverse from the idle state. Normal is 115VDC and is independent of motor speed.

Note: The wire feed direction switch (S3) must be in the forward, or “weld- ing” position.

11.If the above voltages are present and motor does not operate, the motor, motor brushes, or the gear box may be faulty. If the armature voltage is not correct (leads #539 and #541), the control board may be faulty. If the field voltage is not correct (leads #626 and #627), the 1CR relay or relay board may be faulty.

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LN-8