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TROUBLESHOOTING AND REPAIR | ||
| TACH FEEDBACK TEST (continued) |
|
FIGURE F.13 — TACH FEEDBACK TEST.
#3 #1
BLACK RED
| #2 |
J4 | (BLUE) |
|
WIRE FEED
CONTROL BOARD
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TEST PROCEDURE
1.Remove input power from the wire feeder unit.
2.Using the 3/8 in. nutdriver, remove the cover from the wire feeder.
3.Locate plug J4 on the control board. Refer to Figure F.13. Do NOT remove the plug from the control board.
4.Apply the correct input power (from the Power Wave 455 control cable) to the wire feeder unit and check for approxi- mately 12 VDC from pin #1 (red wire) positive to pin #3 (black wire) negative. This is the supply voltage from the con- trol board to the tach feedback unit. If the 12 VDC is missing or not correct, the wire feeder control board may be faulty. Also check for loose or faulty wires and connections.
5.With the gun trigger activated and the motor running, check the feedback volt- age at plug J4 pin #2 (blue wire) posi- tive to pin #3 (black wire) negative. Normal feedback voltage is approxi- mately 5 VDC. If the correct supply volt- age is present and the feedback volt- age is missing, the tach unit may be faulty. With the motor NOT running, the feedback voltage may be either 0 or 10 VDC depending upon where the motor stopped.
6.Remove input power from the wire feeder unit.
7.Install the wire feeder cover with the 3/8 in. nutdriver.
