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Terminals X1 (Forward) and X2 (Reverse) need to be wired to be switched remotely if you wish them
to be controlled by Mach 3 and your CNC controller. The example below shows these terminals
being switched via our 5V relay module, but any other relay or 12-24v DC transistor based control
will work.
The relay module is normally open. When it is activated via the CNC control, it connects the input to
the 0V DC common bus, thus activating the relevant input on the VFD. Releasing the relay will stop
sending the function signal to the VFD. This is an NPN wiring configuration as we are pulling the VFD
terminals down to 0v to send an activation signal to them.
Common 0v DC Bus
Version 1.0 – June 2021
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