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F-17

TROUBLESHOOTING AND REPAIR

F-17

 

WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST (continued)

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5. Make the following voltage tests:

WARNING

ELECTRIC SHOCK can kill.

Do not touch electrically live parts such as output terminals or internal wiring.

All input power must be electrically disconnected before proceeding.

a.Turn the machine OFF between each test.

b.Carefully insert the meter probes into the lead side of plug J4. See Figure F.4.

c.Turn the machine ON and pull the gun trigger to conduct the voltage test.

FROM LEAD

FROM LEAD

FROM LEAD

Black

White

2-29 VDC

Armature

Armature

(varies depending

Lead

Lead

on wire feed

speed)

 

 

6.If the voltage to the wire drive motor armature is zero, check the wires between plug J4 and the wire drive motor. Also check the electrical con- nector J5 for proper connections and jumper plug. See the Wiring Diagram.

7.If all wires and connectors are good and the volt- age to the drive motor armature is zero, the con- trol PC board may be faulty. Replace the control PC board.

8.If the motor is running at high speed and the armature voltage is high and uncontrollable, Proceed with the tachometer test.

TEST FOR SUPPLY VOLTAGE TO TACHOME- TER

1.Disconnect the main AC input power to the machine.

2.Locate plug J4.

3.Locate the tach leads on plug J4. See Figure

F.5.

4.Connect the main input power to the machine.

5.Make the following voltage tests:

WARNING

ELECTRIC SHOCK can kill.

Do not touch electrically live parts such as output terminals or internal wiring.

All input power must be electrically disconnected before proceeding.

a.Turn the machine OFF between each test.

b.Carefully insert the meter probes into the lead side of plug J4.

FROM LEAD

FROM LEAD

FROM LEAD

Black (-)

Red (+)

5-6 VDC

6.If the 5-6 VDC is present, check the leads to the tachometer circuit.

7.If the leads are okay and 5-6 VDC is present, the correct voltage is being received from the con- trol PC board. Continue with the supply voltage to tachometer test.

8.If the 5-6 VDC is not present and the leads are okay, the control PC board may be faulty, replace the control PC board. Also check plug J5 and the jumper plug. See Wiring Diagram.

Power MIG® 215XT

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Lincoln Electric 11521 service manual Wire Drive Motor and Tachometer Feedback Test

11521 specifications

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