Spindle motor runs as soon as machine power on
The Spindle motor start to run as soon as turn on the CNC machine power, with any key pressing or G code command.
Normally this problem need to check below:
1- Could be the IC2803 inside the CNC controller breakdown.
Solution: change the IC2803 or change the CPU board of the CNC controller.
2- Relay or contact terminal of the contactor stuck.
Solution: change the relay or contactor.
3- Wrong wiring.
Solution: Check the wiring and correct it.