Tweco Hefty II CC CV Voltage Sensing Wire feeder - Manual (Page 22)

INSTALLATION
Connections:
See the System Outline drawing (170091) in the
Diagrams chapter of this manual for details.
CAUTION: Make sure all connections
are tight; otherwise, arcing or overheat-
ing could result.
1. Connect a weld cable from the power source to
the weld cable connection of the wire feeder.
2. Connect a weld cable from the power source to
the work connection.
3. Connect the voltage sensing lead from the wire
feeder to the work connection.
WARNING: ELECTRIC SHOCK
CAN KILL! DO NOT touch the
metal portions of the voltage
sensing lead when the power
source output is on.
4. Make the proper gas line connection from the
gas supply to the wire feeder gas valve (if gas will
be used).
5. Attach the welding gun to the wire feeder.
6. Connect the welding gun switch leads to the
wire feeder gun switch receptacle located inside the
case of the wire feeder.
Installation Of Welding Wire
Spool:
See Figures 3-4 and 3-5.
NOTE: The wire spool hub supplied with the
unit is provided for mounting a 30 pound
spool of wire. Optional adapters are avail-
able allowing a 10 or 15 pound spool of wire
or a 14 pound coil of wire to be used.
1. Remove the wire spool hub nut by turning
counterclockwise.
2. Slide the spool of wire over the wire spool hub,
making sure that the alignment pin on the hub enters
the hole in the backside of the wire spool.
3. Replace the wire spool hub nut and turn clock-
wise to a snug position.
NOTE: Install the welding wire spool so the
wire feeds from the bottom of the spool into
the input wire guide.
Adjustment Of Spool Tension:
Adjust the wire spool tension so the wire will feed
freely into the input wire guide. However, the spool
of welding wire must not “coast” when wire feeding
stops. To adjust the wire spool tension, tighten or
loosen the hub tension bolt accordingly (See Figure
3-4).
NOTE: Excessive tightening of the hub ten-
sion bolt will result in a shorter motor life.
Input And Output Wire Guide
Installation:
Refer to Figure 3-5.
Install the input wire guide (the longer one) by
loosening the input guide lockscrew and inserting
the guide into the hole in the feedhead assembly.
The recessed end of the guide should be towards
the wire spool. Adjust the guide so that it is clear of
the feed rolls and tighten the input guide lockscrew.
Install the output wire guide (with the conical end
towards the feed rolls) in the same manner as the
input guide. The conical end of the guide should be
as close to the feed rolls as practical. Tighten the
output guide lockscrew.
NOTE: Before tightening the input and out-
put guide lockscrews, install the drive feed
roll to help in the alignment of the wire
guides.
Selection And Installation Of
Feed Rolls:
NOTE: See feed roll kit drawing (supplied
in the Diagrams chapter) to order feed roll
kits. Kit includes a bearing roll, a drive roll,
an input wire guide, and an output wire
guide for a specific wire type and size.
For installation of feed rolls, refer to Figure 3-3.
For selection of feed roll styles, refer to Figure 4-1.
430429-456
INSTALLATION
November 17, 1999 4-1