Lincoln Electric LN-7 GMA WIRE FEEDERS - Manual (Page 10)

A-3 INSTALLATION
LN-7 & LN-7 GMA
A-3
1. For K291 and K404 cables, connect the end of the
control cable with the lugged leads to the power
source. If lead #21 is extended to work, do not
connect leads to terminal #21 on terminal strip.
For K584, K594 or K480 cables connect the 14
pin amphenol connector to the power source.
Include any jumpers called for on the connection
diagram. Do not add any other jumpers or
connections.
Never operate a Lincoln power source that has a
jumper from #2 to #4 on the terminal strip, or a
power source without a contactor, with this wire
feeder. To do so would defeat the purpose of the
grounding lead protector circuit and could result in
the overheating of the electrical ground circuit to
the wire feeder.
------------------------------------------------------------------------
2. For constant voltage power sources with an
output contactor but no terminal strip or 14-pin
control receptacle, see Figure A.17. For constant
voltage power sources without an internal output
contactor, and requiring a K240 Contactor Kit,
see Figure A.16.
3. If input cables longer than the standard length
must be used, K292 extension cables (50 ft/15.2
m) can be installed. These have polarized plugs
on each end of the control cable and include a 4/0
(107 mm
2 ) electrode cable. Install the extensions
between the standard input cable and the wire
feeder. Total input cable length should not exceed
400 ft (122 m). When using longer lengths of
extension cables, it may be necessary to add
parallel electrode cables to minimize the voltage
drop in the cable.
4. Referring to Figure A.1, route the end of the
electrode cable through the large hole in the back
panel of the LN-7 case. Connect the electrode
cable to the brass conductor block on the front of
the gearbox using the 1/2-13 x .75 bolt provided.
Be sure the cable is placed to allow easy
access and clearance for the idle roll arm
pressure adjustment and to allow the drive
roll section cover to close.
WARNING
CONDUCTOR
BLOCK
ELECTRODE
CABLE
CONTROL
CABLE
FIGURE A.1 – INPUT CONTROL CABLE AND
ELECTRODE CABLE CONNECTIONS.