Anyone can describe for CN1 - CN7 on my Spindle Control above?

I have problem with my spindle, It show OVER FIELD on board when I rotate my spindle. I've change the SCR forward and reverse. and 2 SCR for Field Current.
Still on same condition, when I hit STOP button or rotate spindle to decrease RPM,the problem show up.

Thanks for your attention

Regards,
Andre