SECTION A, PAGE 2
A4. LINE VOLTAGE CONNECTION:
A4.1 POWER CABLE HOLE: Drill or punch power cable hole either
through the back, side or bottom of the cabinet. Drill or punch a second hole to
handle the return cable to the welder transformer.
When doing any punching or drilling in the control cabinet,
be sure to protect the control components from metal
chips. After drilling or punching holes, be sure that all
filings are fully removed!
A4.2 INCOMING POWER CONNECTION: See the hookup diagram in
the back of this book A that matches your welding control style. Bring two line
voltage wires into the control from the factory source being sure to use conduit and
flexible conduit to match local electrical codes. Consult local codes for proper wire
size. Wire should be sized for at least a 50% duty cycle load.
If your control has a built-in circuit breaker, connect the wires to the top terminals
marked L1 and L2 on the circuit breaker.
If you control does not have built-in circuit breaker, connect one incoming power
wire to the terminal on the SCR contactor marked L1.
For controls in a hinged-door cabinet, connect the second incoming power wire to
the terminal block marked L2.
For controls with M in the model number (screwed-together enclosure), connect the
second power wire directly to one leg of the welding transformer. Include a 16-gage
wire from this junction to be brought into the welding control cabinet and connected
to the small terminal block marked L2.
A good source for selecting the proper wire sized is the RWMA bulletin
#16, charts 1.7.15 and 1.7.16 (www.rwma.org). These charts show the
recommended wire sizes, fuses sizes, and disconnect switch sizes.
Remember that resistance welding transformers require different sizing
of these components than regular power transformers.
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