CandCNC
Page 8
1. You need the proper CandCNC Plasma Connection Kit to make the interface to
your plasma cutter.
2. Different types of plasma cutters can be used. Some have everything needed
terminated to one connector (e.g. Hypertherm 45/65/85/105/125) with rear CPC.
Others may have the same or no external connectors. We can only cover a few
specific types.
NOTE: Some plasma cutters use a manual contact start (TAP start) when the end
of the torch has to touch the metal then be retracted to start the arc. These types
of cutters WILL NOT WORK for plasma CNC cutting.
MAKING CONNECTIONS TO
YOUR PLASMA CUTTER
A note about HF start plasma cutters and the DTHCIV.
The DTHCIV is highly isolated from the plasma side and the noise from an HF
start plasma will not enter the controlls thought the PWM module or the
DTHCIV. Most problems from HF start are from having a common
connection to the control side (motor power supply, PC or monitor, etc)
The table and plasma chassis needs a good local earth ground (rod) close to
the table. You need to separate the Plasma cutter and its cables as far as
possible from the controls. You should NOT tie the control side to the same
ground rod as the plasma or table is connected to. The AC safety grounds
between the two systems need to connect at one common point (only) and as
physically separated as possible. In severe cases you may need to provide a
separate clean ground to the control side or even place the control equipment in
a shielded metal enclosure NOT connected to the plasma ground. Even earth
grounded wires with high currents running through them will induct some noise
into anything tied to the same ground. Just a few volts of noise on a shared
ground can disrupt the operation of some PC’s. If you fire your torch and the
PC locks up , CommandCNC stops responding, or the controller does weird
things, you need to start separating the source of the noise (the plasma cutter
and the torch leads) away from the PC control side and break any LOCAL
common connections...even grounds.
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