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F-24

F-24

TROUBLESHOOTING & REPAIR

WIRE DRIVE MOTOR AND TACHOMETER FEEDBACK TEST (continued)

FIGURE F. 8 – PLUG J83 AND J84 LOCATIONS ON FEEDER BOARD

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G3884

J83

J84

TOROID

 

1

 

 

 

MOTOR +

831

1J83

 

 

 

 

MOTOR -

 

2

 

 

 

832

2J83

 

 

 

 

GAS SOLENOID +

 

 

 

 

 

833

3J83

 

 

 

 

 

GAS SOLENOID -

 

PWM CONTROLLED

 

 

834

4J83

 

 

 

 

 

6.5 VDC WHENGAS

 

LOCATED ON

 

 

 

FLOWING COIL

 

 

 

 

 

 

 

CASE BACK

 

 

 

MEASURES 21 OHMS

 

 

 

 

 

 

 

 

 

 

12 VDC COIL

 

 

 

 

 

 

B

W

 

 

ACCESS THIS CONNECTOR

TOROID

 

 

 

 

 

 

 

 

 

 

BY REMOVINGTHE WIRE

 

 

MOTOR / GEARBOX

TACH

 

 

 

 

 

DRIVE ASSEMBLY

 

 

2.6 VDC @ 50 IN/MIN

R

R

1

5VDC TACH SUPPLY

841

1J84

27.4 VDC @ 700 IN/MIN

TACH SIGNAL

U

U

2

847

7J84

TACH COM

8 SECOND AVERAGE CURRENT

B

B

3

844

4J84

 

LIMIT = 3.5A

 

 

4

MEASURE B TO U

 

 

(LIMIT IS SOFTWARE SET)

 

 

 

 

 

 

 

 

120 Hz @ 50 IN/MIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.6 kHz@700 IN/MIN

 

 

J84

J83

844847

832

841831

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TEST PROCEDURE

NOTE: POLARITY MUST BE OBSERVED FOR THESE TESTS.

TEST FOR CORRECT WIRE DRIVE MOTOR ARMATURE VOLTAGE

1.Disconnect main input power to the machine.

2.Open the side panels and remove the tool tray using a 5/16 in. nutdriver.

3.Locate the following leads on plug J83:

4.Locate leads 831(black) and 832(white) on plug J83.

5. Connect the main power to the machine.

7.Make the following voltage tests. From the table below.

8.Carefully insert the meter probes into the back of each Molex plug pin cavity to perform the test.

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

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FROM LEAD

TO LEAD

EXPECTED VOLTAGE

831 +

832 -

2.5-27 VDC

(1J83)

(2J83)

(varies depending

 

 

on wire feed speed)

POWER MIG 300

Page 68
Image 68
Lincoln Electric SVM160-B service manual Wire Drive Motor and Tachometer Feedback Test, J83 J84

SVM160-B specifications

The Lincoln Electric SVM160-B is a standout model in the realm of portable arc welders, designed specifically for light to medium-duty welding tasks. As part of Lincoln Electric’s renowned line of welding equipment, the SVM160-B combines efficiency with durability, catering to both professional welders and hobbyists alike.

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