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TROUBLESHOOTING AND REPAIR | ||
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TACH FEEDBACK TEST
(continued)
FIGURE F.2 – TACH FEEDBACK TEST.
Black RED
| WIRE FEED |
BLUE | CONTROL BD. |
J84
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TEST PROCEDURE
1.Remove input power from the wire feeder unit.
2.Using the 3/8 in. nut driver, remove the cover from the wire feeder.
3.Locate plug J84 on the feedhead board. Refer to Figure F.2. Do NOT remove the plug from the feedhead board.
4.Apply the correct input power (from the Power Wave 455 control cable) to the wire feeder unit and check for approximately 5VDC from (red wire) positive to (black wire) negative. This is the supply voltage from feedhead board to the tach feedback unit. If the 5VDC is missing or not correct, the feedhead 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 voltage at plug J84 (blue wire) positive to (black wire) negative. Normal feedback voltage is approximately 2 VDC. If the correct supply voltage is present and the feedback voltage is mssing, the tach unit may be faulty. With the motor NOT running, the feedback voltage may be either 0 or 2 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. nut driver.
