Lincoln Electric SVM154-A 20TROUBLESHOOTING and REPAIRF-20, Tach Adjustment and Feedback Test

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F-20TROUBLESHOOTING AND REPAIRF-20

TACH ADJUSTMENT AND FEEDBACK TEST (continued)

FIGURE F.2 — TACH FEEDBACK TEST.

#500

BLACK

#555

BLUE

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TEST PROCEDURE

1.Remove input power to the LN-10 unit.

2.Using the 5/16 in. nut driver, remove the wire drive cover.

3.Locate the three hall effect leads (blue, red and black). See Figure F.2.

4.Apply the correct input power (42 VAC) to the LN-10.

5.Check for approximately 12 VDC from red lead #512 (+) to black lead #500 (-). If the 12 VDC is NOT present or low, the control board or associated leads or plugs may be faulty. See the Wiring Diagram.

FIGURE F.2A— MODULE LOCK NUT

#512

RED

Lock Nut

6.Activate the gun trigger. Make sure the motor is running. Check for the pres- ence of approximately 5.0 VDC from blue lead #555 (+) to black lead #500 (-). The 5.0 VDC represents the correct feedback voltage from the hall effect device to the control board.

7.If the above voltage reading is not cor- rect, the hall effect device may need to be adjusted or replaced. See Tach

Adjustment Procedure.

LN-10