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.

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

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

322

8.2

60 +/- 1

322 +/- 3

08.2 +/- .1

LN-9FH