I have an Alpha PRS about 10 years old. I've had issues with starting the CNC for a long time. On initial startup the control software (3.8.42) would state the reset on the remote pendant needs to be reset. It would not. After a few hours of sitting idle, the error would go away and all would work properly. The quick fix was to leave the machine powered on.

Well fast forward several years with only turning the control box off once in a while. This last cycle when turning on the control box, the spindle fan comes on, push reset on the pendant switch to power on the VFD and nothing. Yaskawa VFD 10250.

My question is where do I start to look?

Feel free to ask more questions if needed.

Thanks, Tracy