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C-3 C-3
INVERTEC STT
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LN-742 or STT-10 WIRE FEEDER
CONNECTION INSTRUCTIONS
The LN-742 or STT-10 is the recommended wire feed-
er for use with the Invertec STT II. Refer to the LN-
742 or STT-10 Operator Manual for Wire Feed
Operation. Refer to Figure C.2 or C.3 and follow the
instructions below to connect the LN-742 or STT-10.
1. Turn the Invertec STT II power off.
2. Connect the ARC SENSE LEAD MS connector to
the mating connector on STT II front panel.
3. Connect the electrode lead (Twist-Mate) to (+) out-
put terminal on STT II.
4. Connect the other end of electrode lead (Step #3)
and the ARC SENSE LEAD (lead with ring lug, step
#2) together to the gun block on the LN 742.
5. Connect work lead between STT (-) terminal and the
work piece.
6. Connect the ARC SENSE LEAD “WORK” (lead with
alligator clip) to work piece.
NOTE: For best welding performance make this
connection as close as possible to the
welding arc.
7. Connect the wire feeder control cable between the
LN-742 or STT-10 and the 14-pin Wire Feeder
Receptacle on the STT II. For the STT-10 Wire
Feeder: Connect the second wire feeder control
cable between the STT-10 and the 10-pin Remote
Receptacle on the STT II.
M17657
ARC SENSE LEAD
’ELECT"
CONNECT ELECTRODE LEAD AND "ELECT"
ARC SENSE LEAD TOGETHER TO ELECTRODE
TERMINAL OF WIRE FEEDER.
ELECTRODE LEAD
Only qualified persons should install,
use or service this machine.
WIRE FEEDER
LN 742
LN7 GMA
LN9 GMA
NA5R
NA5
WARNING
ELECTRIC
SHOCK
CAN KILL
Turn off input power to the Welding
Power source using the disconnnect
switch at the fuse box before
connecting the wire feeder.
REMOTE RECEPTACLE
WORK
WORK LEAD
CONTROL, ELECTRODE, ARC SENSE "ELECT"
AND ARC SENSE "WORK" CABLES SHOULD
BE TAPED TOGETHER.
WIRE FEEDER
CONTROL CABLE
ARC SENSE LEAD "WORK"
(SHOULD BE LOCATED
AS CLOSE AS POSSIBLE
TO THE WELDING ARC.)
CRM after 6-10-96
FIGURE C.2 LN-742 to STT II CONNECTION
WARNING
ELECTRIC SHOCK can kill.
• Only qualified personnel should perform
this installation.
•Turn the input power OFF at the discon-
nect switch or fuse box before connecting
the wire feeder