Nelson Nelweld 4000, Operation And Service Manual

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Nelweld Operations and Service Manual
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Figure 3-6: Link connections for 220/380/415/440 V model
Reord er Num ber
4 40 V O L T S
Nelso n Stud W elding, Inc.
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380 V O LT S
4 15 V O L T S
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3.8.2 Machine Grounding
The frame of the welder must be grounded. A
ground stud marked with the symbol is
located on the cabinet floor for this purpose. Do
not connect this external ground lead to a stud
that already has an internal ground lead
connected to it. Consult your local and national
electrical codes for proper grounding methods.
3.8.3 Input Fuse and Supply Wire
Considerations
Refer to the Technical Specifications at the
beginning of this Installation section for
recommended fuse and wire sizes. Fuse the
input circuit with the recommended super lag
fuse or delay type breakers (also called “inverse
time” or “thermal/magnetic” circuit breakers).
Choose input and grounding wire size according
to local or national electrical codes. Using fuses
or circuit breakers smaller than recommended
may result in inappropriate shut-offs from
welder inrush currents, even if the machine is
not being used at high currents.
3.8.4 Input Voltage Reconnect Procedure
Welders with transformers that have primary
voltage taps rated for 460VAC/60Hz or
440VAC/50 Hz will be shipped wired for these
voltages respectively. To move this connection
to a different voltage, remove the left side case
side panel, with respect to the front of the
machine, and refer to the reconnect instructions
located on the decal attached to the machine
floor in front of the transformer, or as shown in
Figures 3-3, 3-4, 3-5, and 3.6 . Welders with
transformers rated at 400 VAC, 50 Hz are not
reconnectable, and thus are shipped wired at 400
VAC.
3.9 Output Connections
Use the largest welding and ground cables
suitable for the job. For large studs and/or long
cable runs, 4/0 copper wire cables are preferred.
Voltage drops can become excessive, leading to
poor welding characteristics if undersized
welding cables are used.
To avoid interference problems with other
equipment and achieve the best possible results,
• Route all cables directly to the work and
gun.
•
Avoid excessive lengths
• Bundle the gun and ground cables together
where practical
• Do not coil excess cable.
3.9.1 Gun Control Cable Connections
Connect the control cable between the gun and
the power source output panel connector marked
with a gun symbol.