[phomann]

Hi,
have designed a spindle monitoring board that can interlock the VFD from operating or at need send an Estop command to the CNC controller.

The board monitors the three Tool-in-Place switches within the spindle, the PTC temp sensor in the spindle, it monitors the NTC thermistor that is detecting the presence of coolant flow (in the coolant return line),
the Tool Change Request switch and monitors if Mach is Enabled and finally it monitors the VFD and can thus tell if the spindle is still powered and spinning.

I have used a small AVR microprocessor for logic and monitoring purposes.

The board can interrupt the VFD ON/OFF signal, can signal an over-temp event and Estop Mach should it be required. It also controls the Tool Change air solenoid, the Seal Air solenoid and the Taper Blow air solenoid.

Fits on a 80mm x 100mm board. It is powered by a 30VA transformer, 230V input 18VAC output or 24VDC when rectified and filtered.

Craig

Nice! F you want to reduce the parts count, use a ULN2003 instead of discrete tranies, diodes, etc. they interface to logic really well and have flywheel diodes built in.

Cheers

Peter


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