Help needed to connect my VFD to the AXBB controller

[CharlieRam]

It's all working now although I hacked an old cheapo usb gamepad to use the inputs from my pendant and control panel and it seems the spindle is causing some interference which is occasionally switching the coolant on or the spindle off! I need to find another way of allowing all the inputs or stopping the usb gamepad board being affected

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[Doddy]

If you believe it's the spindle (and this is not unlikely), then look at the shielding on the cable to to machine - ensure that it's grounded both ends and ensure that controller and machine share a low impedance path to earth. Share a common earth at the controller for the shielding on all inputs to the controller and/or use differential inputs with/without shielding. Get some ferrites on the supply to the VFD, and to the gamepad.