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OPERATING INSTRUCTIONS
Input Power and Grounding Connections
Before starting the installation, check with the power com-
pany to be sure your power supply is adequate for the volt-
age, amperes, phase and frequency specified on the welder
nameplate. Also, be sure the planned installation will meet
the United States National Electrical Code and local code
requirements. This welder may be operated from a single
phase line or from one phase of a two or three phase line.
All models designed to operate on less than 250 volt input
lines are shipped with the input cable connected to the
welder.
Place the welder so there is free circulation of air in through
the louvers in the back and sides of the case and out of the
bottom on all four sides. Mount a NEMA Type 6-50R
receptacle in a suitable location. Be sure it can be reached
by the plug on the input cable attached to the welder.
Using the following instructions, have a qualified electri-
cian connect this receptacle (NEMA 6-50R Type) to the
power lines at the fuse box. Three #10 or larger copper
wires are required if conduit is used. For long cable runs
over 100', #8 or larger wire in conduit will be needed to
prevent excessive voltage drops. Fuse the two hot lines
with 50 ampere super lag type fuses as shown in the fol-
lowing diagram. The center contact in the receptacle is for
the grounding connection. A green wire in the input cable
connects this contact to the frame of the welder. This
insures proper grounding of the welder frame when the
welder plug is inserted into the receptacle. If a separate dis-
connect switch is used, it should have two poles for the two
hot lines and both should be fused for 50 amperes.
Attaching Electrode Cable to Holder
1. Loosen locking screw and slide handle off holder. Place
handle over electrode cable.
2. Remove insulation from electrode cable 1” ± 1/16”
(25.4mm ± 1.6mm) from end.
3. Back out cable connecting screw until end is flush with
inside surface of jaw body.
4. Remove cable connecting clamp from holder jaws. Place
clamp over bare end of electrode cable and insert into
holder with clamp centered against connecting screw.
5. Tighten cable connecting screw securely against clamp.
These installation instructions apply to the input wiring
and overload protection installed to supply one AC-235
and comply with the United States National Electrical
Code as it applies to electric welders. Other equipment
should not be connected to this supply without consult-
ing the input power requirements for that equipment,
the United States National Electrical Code, and all local
codes.
WARNING
•Have an electrician install and service this equipment.
•Turn the input power off at the fuse box before work-
ing on equipment.
•Do not touch electrically hot parts.
WARNING
Before attaching the electrode cable to the electrode
holder or the work cable to clamp, be certain the welder
is turned off or the input power is disconnected.
WARNING
CONNECT TO A SYSTEM GROUNDING
WIRE. SEE THE UNITED STATES
NATIONAL ELECTRICAL CODE
AND/OR LOCAL CODES FOR OTHER
DETAILS AND MEANS FOR PROPER
GROUNDING.
CONNECT TO HOT WIRES OF
A THREE-WIRE, SINGLE
PHASE SYSTEM OR TO ONE
PHASE OF A TWO OR THREE
PHASE SYSTEM.
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