Lincoln Electric SVM127-A service manual Wire Speed Accuracy Test

Models: SVM127-A

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TROUBLESHOOTING & REPAIR

WIRE SPEED ACCURACY TEST (continued)

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TEST PROCEDURE

Perform the following checks with the LN-9 wire feeder connected to a Lincoln CV welding power source according to the proper connection dia- gram. (See the Installation section of this manu- al.)

A.Check for the proper wire feed inches per revolution of the drive roll.

1.Set the LN-9 wire speed control for between 50 and 120 IPM (1.27 to 3.17 M/MIN).

2.Measure the precise length of wire fed by exactly 10 revolutions of the drive rolls. This measured length should be 53.0 +/-

.8 inches (1.35 +/-.02 meters). If not, there may be a problem with the wire or

the wire feed path. See the

Troubleshooting Guide (Feeding Problems) in this section of the manual. Also check for correct drive roll tension adjustment.

B.Check for the proper drive roll revolutions per minute.

1.Adjust the LN-9 wire speed control for the LN-9 actual speed meter readings given in the table below.

2.Compare the corresponding LN-9 drive roll RPM (counted revolutions in 60 sec- onds) and LN-9 SET speed meter read- ings with the table below. The numbers should match. If not, perform the Meter

Circuit Accuracy Test.

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MODEL

ACTUAL SPEED METER

MEASURED

SET SPEED METER

 

READING

 

DRIVE ROLL

READING

 

 

 

 

SPEED

 

 

 

 

 

 

 

 

 

MODEL

IN/MIN

 

M/MIN

RPM

IN/MIN

M/MIN

 

 

 

 

 

 

 

LN-9

158

 

4.0

30 +/- 1/2

158 +/- 2

04.0 +/- .1

or

316

 

8..0

60 +/- 1

316 +/- 2

08.0 +/- .1

LN-9F

 

 

 

 

 

 

 

 

 

 

 

 

 

LN-9H

161

 

4.1

30 +/- 1/2

161 +/- 3

04.1 +/- .1

or

322

 

8.2

60 +/- 1

322 +/- 3

08.2 +/- .1

LN-9FH

 

 

 

 

 

 

 

 

 

 

 

 

 

LN-9 Wire Feeder

Page 101
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Lincoln Electric SVM127-A service manual Wire Speed Accuracy Test, Check for the proper drive roll revolutions per minute