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TROUBLESHOOTING & REPAIR
F-47 F-47
LN-9 GMA Wire Feeder
WIRE SPEED ACCURACY TEST (continued)
TEST PROCEDURE
Perform the following checks with the LN-9 GMA
wire feeder connected to a Lincoln CV welding
power source according to the proper connection
diagram. (See the
Installation
section of this
manual.)
A. Check for the proper wire feed inches per
revolution of the drive roll.
1. Set the LN-9 GMA 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 sec-
tion 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 GMA wire speed control
for the LN-9 GMA ACTUAL speed meter
readings given in the table below.
2. Compare the corresponding LN-9 GMA
drive roll RPM (counted revolutions in 60
seconds) and LN-9 GMA SET speed
meter readings 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 GMA 161 4.1 30 ± 1/2 161 ± 3 04.1 ± .1
or 322 8.2 60 ± 1 322 ± 3 08.2 ± .1
LN-9F GMA