16
INSTALLATION
ELECTRODE AND WORK CONNECTIONS
OUTPUT POLARITY CONNECTIONS
The Power MIG® 21
1i
features a short lead protruding from the
front of the machine, the lead can be used to configure the wire
drive
polarity. For FCAW
and GMAW welding this lead can be
connected to either the positive
output stud or negative output stud.
Connecting the lead to the
positive stud will electrically connect the
wire drive to positive
polarity; the work clamp would then connect
to the negative stud.
Ensure connector is tightly locked into place
by rotating clockwise.
PROCEDURE FOR CHANGING DRIVE AND IDLE ROLL SETS
1. Turn off the power source.
2. Release the pressure on the idle roll by swinging the adjustable
pressure arm down toward the back of the machine. Lift the cast
idle roll assembly and allow it to sit in an upright position.
3. Remove the outside wire guide retaining plate by loosening the two
large knurled screws.
4. Twist the drive roll retaining mechanism to the unlocked position
as shown below and remove the drive roll.
5. Remove the inside wire guide plate.
6. Replace the drive roll and inside wire guide with a set marked for
the new wire size.
NOTE:
Be sure that the gun liner and contact tip are also sized to
match the selected wire size.
7. Manually feed the wire from the wire reel, over the drive roll groove
and through the wire guide and then into the brass bushing of the
gun and cable assembly.
8. Replace the outside wire guide retaining plate by tightening the two
large knurled screws. Reposition the adjustable pressure arm to its
original position to apply pressure. Adjust pressure as necessary.
POWER MIG 211i
®