I’m building a control box for my CNC (Ooznest ox), it uses Mach3 USB board. This is an upgrade from the smaller CNC I had before, which runs GRBL.
So the issue I’m having is related to the power relay… Both before, using 12V signal from the GRBL board, and now using the 24V signal from the Mach3 board.
I’ve blown 3 cheap mechanical relays already. Now installed a SSR-25 DA solid state relay. It is switching correctly, and works (I can switch the relay on/off from the software, which uses a 24V signal, however it is only measured to be ~17.5VDC at the SSR input).
I’m sure something isn’t right. Because there is a 30VAC passing through the SSR in the open state, and the spindle power indicator connected to the load side of the SSR is pulsing…
I’m unsure what the problem is. Attached a photo of the box here. Don’t mind the mess around the relay/spindle, its temporary
Would anyone be able to help me? I don’t even know what the problem is… happy to bring the box in to the space.
Relay wired like this