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Install the welder in a dry location where there is free circu-
lation of air in through the louvers in front and out through
the louvers in the back of the case. A location which mini-
mizes the amount of smoke and dirt drawn into the
machine reduces the chance of dirt accumulation that can
block air passages and cause overheating.
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Have a qualified electrician make the complete input con-
nection in accordance with the National Electrical Code,
all local codes and the connection diagram located inside
the machine.
Be sure the voltage, phase and frequency of the input power
is as specified on the welder nameplate.
For most installations, connect the AC-1200 to single phase
power or to one phase of a three phase line. Unbalanced
line conditions can be easily avoided by properly balancing
the AC-1200 with other machinery on the lines.
When installing two or four Scott connected AC-1200
machines for AC-AC tandem arc welding, three phase input
power must be used. The terminals for connections to pro-
vide an output phase angle less than or greater than the
usual 90% phase angle are included on the input panel.
The AC-1200 does not have an input contactor. Therefore,
include an external starter or disconnect switch when plan-
ning the input circuit.
Remove the right side panel of teh AC-1200 and bring the input
power lines through the hole in the back of the case. See the
table below for reccomended sizing of input leads and overcur-
rent protection.
The frame of the welder must be grounded, A stud marked with
the symbol located on the welder case back hole in the
back of the case is provided for this purpose. See the National
Electrical Code for details on proper grounding methods.
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a. Wire Feeder Connection
Turn the input power to the welder off. Remove the screw
and lift the hinged door on the front of the control panel to
expose the terminal strips. Connect the leads of the wire
feeder input control cable to the terminal strips exactly as
specified in the appropriate connection diagram. The AC-1200
to NA-4 connection diagrams are included in the NA-4
Operating Manual IM-278. Attach the control cables to the
panel at the right of the terminal strip using the clamps pro-
vided.
If connecting the AC-1200 to an older NA-4 with the toggle
switch type ‘Current Control’ (below code 7532), a K-775
‘Remote Control’ must be purchased and instal-led in accor-
dance with the connection diagram S-15667 on page 5. The
‘Remote Control’ cord can be lengthened to any length by prop-
erly splicing a four conductor cord to the standard 25’ cord
before connecting to the AC-1200 terminal strip.
If connecting the AC-1200 to an LAF-4 or the AC controls of
the LT-34 tractor, the AC-1200 must be ordered with the
required ‘–NL’ optional circuit installed. This kit includes the
K-775 ‘Remote Control’. Connect in accordance with dia-
gram S-15666 on page 5.
To connect the AC-1200 to any other wire feeder, write to the
factory for instructions giving complete nameplate information
for the specific equipment.
When connection to the terminal strips are completed, close
the door and replace the screw.
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Thomas & Betts wire terminals (or equal) recommended above are required to comply with applicable U.L. stan-
dards for safety. A #30 hex (Allen) key wrench is required for assembly of terminals to wire.
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460/60 182 209 #4/0 31013 250MCM 31013 #4 31007 #3 31007 300 350
440/50/60 190 219 #4/0 31013 250MCM 31013 #4 31007 #3 31007 300 350
380/50/60 230 254 250MCM 31013 350MCM 31015 #3 31007 #3 31007 300 400
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• Have an electrician install and
service this equipment.
• Turn the input power off at the
fuse box before working on
equipment.
• Do not touch electrically hot
parts.