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ALC-401 Arc Length Control
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Mount the welding torch in the torch holder
bracket at the lower end of the actuator slide.
The bracket is designed to hold torches with
diameters from 3/4” to 1½” (19 to 38 mm). For
special torches (as may be used for PTA appli-
cations), the torch holder may be removed and
replaced by a special mounting bracket. Use 10
x 24 UNC screws to secure the special bracket to
the torch holder. When using special brackets,
take care not to overload the actuator. Its weight
carrying capacity is a maximum load of 40 lb
(18 kg) with a center of gravity in line with the
centerline of the original torch holder, this is not
more than 1 1/4” (29 mm) from the face of the
torch holder.
C. Control
The control should be mounted on a vertical
surface at a convenient operating position for
the operator and within the recommended cable
length from the actuator. The control has four
mounting holes for 5/16” (8 mm) diameter
screws. Because of the advanced technology
used in the control, there is little heat generated
during the operation of the unit. It is not there-
fore necessary to allow large clearances around
the control for cooling purposes. Some space
should be allowed at the right hand side of the
control, this is where the connections are made
using Amphenol® connectors. If space is at a
premium, right angle connectors are available
from Jetline or your local electrical supplier.
The control is tted with an 6 ft (1.8 m) long
power cord. The cord has an integral 3-pin con-
nector suitable for connection to standard U.S.
110 volt, single phase receptacles. If the unit
is to be used with 220/240 volt, single phase,
it will be necessary to cut off the 110 volt plug
and secure a suitable plug to match the 220/240
volt receptacle in the country in which the unit is
being used. It is now necessary to open the front
panel of the control (this is done by unscrewing
and removing the two 10-32 button head screws
using a 1/8” (3 mm) Allen wrench) in order to
change the voltage input setting. The input volt-
age is changed from 110 to 220 volts by using a
screwdriver and turning the range switch which
is located on the transformer situated in the cen-
ter of the lower part of the control box.
It is important that, in addition to the conven-
tional electrical ground on the mains supply, the
control should be connected to the ground rod.
A connector is provided for this purpose on the
underside of the control cabinet. Use a 12 ga (3
mm2) cable tted with a 1/4” (6 mm) lug at the
control end.
D. Torch
The welding torch should be mounted in the
clamp provided for this purpose on the lower
end of the torch slide on the actuator. The torch
can be mounted at any point along the length of
the barrel, this permits wire guide positioners,
camera and magnetic oscillation mounts to be
accommodated on the barrel below the torch
holder.
E. Interconnections
It is necessary to connect the red sense lead
which exits the top of the actuator to the torch.
Most machine type torches have a connection
for this purpose. This connection can usually
be found at the back end of the torch, inside
the rubber insulator. The brass cable connector
is threaded and a screw provided for the sense
lead connection. If the torch does not have this
connection, connect the red sense lead, either to
the torch connection block (if one is provided),
or to the welding power supply terminal.
The cable provided is 3 ft (1 m) long. If it is nec-
essary to extend this cable, use a well-insulated
splice connection and a suitable length of Bel-
don® #9867 wire. This is a very high voltage
wire, use of an inappropriate wire will lead to
arc starting problems and interference with other