G'day!
I'm trying to get my G540 to control the spindle on a SX2 mini mill through the LMS breakout board (CNC Spindle Control Upgrade Kit for SX2, SC2 230V 4950 - LittleMachineShop.com).
So far I've managed to verify that:
- The LMS board works (wired up the simplest connection, turned the potentiometer to tweak spindle RPM)
- LinuxCNC can output a 50Hz PWM signal to the G540 (checked with an oscilloscope at both ends of the DB25)
- The wiring is correct (checked multiple times)
- The F/R and Start/Stop signals from LinuxCNC to the breakout board through the G540 work (tested with a multimeter at the G540 12-pin terminal block)
But the VFD Output (pin 8 on the terminal block) shows no output voltage at any RPM setting on LinuxCNC.
Nick