Gun Installation - Lincoln Electric PRO 155 Operator's Manual

A-4
Work Cable Installation
Refer to Figure A.2.
1. Open the wire feed section door on the right side of
the PRO 155.
2. Pass the end of the work cable that has the termi-
nal lug with the smaller hole through the Work
Cable Access Hole (1) in the case front.
3. Route the cable under and around the back of the
Wire Feed Gearbox (6).
4. For Innershield Only: Refer to Figure A.2. As
delivered, the PRO 155 is connected for negative
electrode polarity. This is the appropriate configu-
ration for the Innershield process. To complete
installation, use the provided wing nut to connect
the work cable's terminal lug to the positive (+) out-
put terminal (5) located above the Wire Feed
Gearbox (6). Make sure that both wing nuts are
tight.
5. For GMAW Only: Refer to Figure A.4. To wire for
positive polarity (required for the MIG process),
connect the short cable attached to the connector
block (1) to the positive (+) output terminal (4) and
the work cable (3) to the negative (–) terminal (2).
FIGURE A.4
4
2
1

GUN INSTALLATION

As shipped from the factory, the PRO 155 gun is ready to
feed 0.045" (1.2 mm) wire. If .023" – .025" (0.6 mm) or
.030" (0.8 mm) wire is to be used for the GMAW (MIG)
process, change the contact tip to the appropriate size
and install a gas nozzle included with the K610-2 MIG
Conversion kit. Additionally, the .023 – .030" (0.6 – 0.8
INSTALLATION
mm) gun liner included in the K610-2 MIG Conversion Kit
must be installed. Also a KP665-035 drive roll must be
used. This drive roll is not part of the K610-2 kit and must
be ordered separately. Refer to the MAINTENANCE sec-
tion for contact tip and drive roll installation details.
Connecting Gun Cable to the PRO 155
1. Refer to Figure A.2. Unplug the machine or turn
power switch to the OFF "O" position.
2. Pass the insulated terminals of the gun trigger con-
trol leads, one at a time, through the Gun Cable
and Control Lead Access Slot (2) in the case front.
The leads are to be routed up the inside of the
case front and behind the gas line.
3. Insert the connector on the gun conductor cable
through the Gun Cable Access Hole (2) in the
PRO 155 case front. Make sure the connector is all
the way in the brass connector block. Unscrew
thumbscrew on the connector block a few turns if
gun connector will not insert fully. Rotate the con-
nector so control leads are on the underside and
tighten the Thumbscrew (8) in the connector block.
4. Connect the gun trigger control lead terminals to
the two insulated 1/4" (6,4 mm) tab terminal con-
nector bushings located above the "Gun Trigger
Connection" decal in the wire feed section (4).
Either lead can go to either connector. Form the
leads so that they are as close as possible to the
inside panel.
3
If the gun trigger switch being used is other than
that supplied with the PRO 155, the switch must
be a normally open, momentary switch. The termi-
nals of the switch must be insulated from the
welding circuit. Malfunction of the PRO 155 may
result if this switch shorts to the PRO 155 welding
output circuit or is common to any electrical cir-
cuit other than the PRO 155 trigger circuit.
PRO 155
CAUTION
A-4