Lincoln Electric SVM127-A service manual Apply 115 VAC power

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F-32 F-32

INSTALLATION

WIRE DRIVE MOTOR AND TACH FEEDBACK TEST (continued)

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6. Apply 115 VAC power.

WARNING

ELECTRIC SHOCK can kill.

•With power applied, there are high voltages inside the wire feeder. Do not reach into the wire feeder or touch any internal part of the wire feeder while power is applied.

7.With the gun trigger activated or the gun ter- minals jumpered together (see the Wiring Diagram), check the motor armature volts at leads #541(+) and #539(-). Normal is 5 to 95VDC depending on the wire feed speed setting. As the armature voltage is increased the wire feed speed should increase.

8.With the LN-9 at idle (gun trigger NOT acti- vated), check the motor field voltage at leads #626 and #627. Normal is 115VDC. When the gun trigger is activated or the gun terminals are jumpered together (see the Wiring Diagram), the field voltage polarity should reverse from the idle state. Normal is 115VDC, independent of motor speed.

9.If the above voltages are present and the motor does not operate, the motor, motor brushes or gear box may be faulty.

If the armature or field voltages are missing or not correct, the power board or 1CR relay may be faulty.

If the motor is running at high speed and the armature voltage is high and uncontrollable, proceed with the Tach Feedback Test.

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LN-9 Wire Feeder