My Powermatic 3520a was working fine but now will not start. The inverter runs and hums. I have cleared all faults and reset to factory defaults. When power is applied the status on the display is OFF ov o RPM LOC o.oa 0.00HZ the Stop button is lighted (I think normal status should show STP instead of OFF) I have replaced the power switch (Red Button), sorted across the remote power switch to take it out of the equation, and verified 240+ volts getting to the inverter. If I select JOG and hold the FWD (run) button the motor spins slowly. I suspect I have something programmed wrong in inverter control. Here is photo of my inverter control.