Tweco 180 Portable MIG - Manual (Page 38)

FABRICATOR 140, 180 OPERATION
Manual 0-4991 4-2 July 20, 2007
NOTE
Genuine TWECO contact tips and liners should
be used. Many non-genuine liners use inferior
materials which can cause wire feed problems.
(9) The Gun Adaptor connects the MIG Gun to the
feedhead assembly.
(10) The Gun Switch Connector is provided for
connection of the Gun Switch Leads.
(11) 32A Primary Circuit Breaker.
(12) Negative (-) Welding Terminal.
(13) Positive (+) Welding Terminal.
CAUTION
Loose welding terminal connections can cause
overheating and result in the cables being
fused to the welding terminals.
(14) The wire reel hub incorporates a friction brake
which is adjusted during manufacture for
optimum braking. If it is considered necessary,
adjustment can be made by turning the large nut
inside the open end of the wire reel hub. Clockwise
rotation will tighten the brake. Correct adjustment
will result in the wire reel circumference continuing
no further than ¾” (20mm) after release of the
Torch Trigger Switch. The wire should be slack
without becoming dislodged from the reel.
CAUTION
Excessive tension on the brake will cause rapid
wear of mechanical wire feed parts,
overheating of electrical components and
possibly an increased incidence of wire
burnback into the contact tip.
4.02 Fabricator Controls
Refer to Figure 4-1
(1) The Wire Speed Control knob controls the welding
current via the electrode wire feed rate (i.e. the
speed of the wire feed motor).
(2) The Voltage Control Switch sets the voltage level to
the welding terminals as it is rotated in the clockwise
direction. There are 4 positions available in the
Fabricator 140 and 6 positions in the Fabricator 180.
The OFF switch position disconnects the power
from the controls.
CAUTION
The Voltage Control Switch MUST NOT BE
SWITCHED during the welding process. Some
internal electrical components are at Mains
voltage potential with this switch in the OFF
position.
(3) MIG Gun cable end and Gun Switch Leads are
routed through this opening.
(4) The Work Cable & Clamp connects to the item
being welded.
(5) The gas inlet nipple is used to connect the gas
hose to the gas regulator for GMAW or FCAW.
Use the hose clamp to secure the has hose to the
gas nipple.
(6) Main Power Cable (Fabricator 140 shown)
(7) The FABRICATOR 180A MIG gun has an operating
capacity in excess of the capacity of the
FABRICATOR and may be fitted to many different
types of MIG welding power supplies.
(8) The moveable roller applies pressure to the
grooved roller via screw-adjustable spring
pressure. The adjustable spring screw should be
adjusted to a minimum pressure that will provide
satisfactory wire feed without slippage. If slipping
occurs, and inspection of the wire contact tip
reveals no wear, distortion or burn-back jam, the
conduit liner should be checked for kinks and
clogging by metal flakes and slag. If this is not
the cause of slipping, the feedroll pressure can
be increased by rotating the adjustable spring
screw clockwise. The use of excessive pressure
may cause rapid wear of the feed roller, motor
shaft and motor bearings.