Secondary (Output) Connection; Accessories; Recommended Output Cable Sizes - ESAB Heliarc 252 Instruction Manual

SECTION 2
Verify that all electrical connections
comply with local electrical codes
and especially with requirements
established in booklet F-11-831 "High
Frequency Stabilized Arc Welding
Equipment", which is packed with this
power source.
Before making any connections to the
power source's output receptacles,
make sure that all primary input power
to the machine is deenergized (off) at
the customer's disconnect switch.
2.3 SECONDARY (OUTPUT) CONNECTIONS
Refer to Interconnection Diagram, Figure 2-5, for typical secondary output,
process gas and water, and torch connections that are required for this unit's
welding application.
The proper operation of the welding machine depends to a great extent on
the use of output cables that are insulated copper, adequately sized, in good
condition, and properly connected to the machine using UL listed pressure wire
connectors. It is recommended that the output cables be kept as short
as possible (this is particularly important for tig applications using high
frequency AC), and have adequate current carrying capacity. The resistance
of the output cables and connections causes a voltage drop which is added to
the voltage of the arc. Excessive cable resistance may result in overloading
as well as reducing the maximum current output of which the power source is
capable. The welding output terminals are located on the front panel. Table 2-2
will prove useful for selecting the recommended output cable size.
Table 2-2. Recommended Output Cable Sizes
Welding
Current,
Amps
50 100 50 200 250
200 2 2 1 1 1/0
250 1 1 1/0 1/0 1/0
300 1/0 1/0 1/0 2/0 3/0
350 1/0 2/0 3/0 3/0 4/0
*Total cable length includes work and electrode cables. Cable size is based on direct current,
insulated copper conductors, 40% duty cycle, and a voltage drop of 4 or less volts. The welding
cable insulation must have a voltage rating that is high enough to withstand the open circuit voltage
of the machine.

2.4 ACCESSORIES

1. FC-5B Foot Current/Contactor Control, P/N 33646 or FC-5BEHD Foot
Current/Contactor Control, P/N 33841. This device provides the opera-
tor with remote control of current and contactor operation at the welding
station. Interconnection of these functions to the main unit is provided by a
mating 30-foot cable/plug assembly. By depressing the foot pedal, the weld-
start sequence circuit will energize, and the welding current will increase
or decrease within the range preset on the power source Current Control
potentiometer.
2. TC-2B Torch Current and Contactor Control, P/N 33839 (30-ft lg). This
remote fingertip control is designed to be taped to any Tig torch handle and
to provide the operator with complete contactor control and variable control
of the welding current. By simply rotating the knob clockwise (off of zero),
the integral switch will energize the contactor. Further rotation (clockwise)
will increase the output current up to the limit preset on the power source
main control.
3. HC-3B Current Hand Control, P/N 33838. This accessory operates in se-
ries with the power sources "main current control" potentiometer to provide
remote (up to 25-ft.) current regulation. The hand control potentiometer's
current adjustment is always controlled by and limited to the range that is
preset on the main current control.
21
Total Length ( Feet) of Cable
in Weld Circuit*
INSTALLATION