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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-1500 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-1500 with other machinery on the lines.
When installing two or four Scott connected AC-1500
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 90º phase angle are included on the input panel.
The AC-1500 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 the AC-1500 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 overcurrent protection.
The frame of the welder must be grounded, A stud marked
with the symbol located on the welder base below
the panel is provided for this purpose. See the National
Electrical Code for details on proper grounding methods.
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-1500 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 provided.
If connecting the AC-1500 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 accordance with the connection diagram S-15667
on page 5. The ‘Remote Control’ cord can be lengthened
to any length by properly splicing a four conductor cord
to the standard 25’ cord before connecting to the AC-
1500 terminal strip.
To connect the AC-1500 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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