sir ,sorry for the mistakenly printing the subject in the name ...

I already have a freewheeling diode before my relay coils but no RC snubber at the output contacts as I drive the Grinding motors contactors via a 110VDC return from my onboard potential free contacts of the relays make and break the Grinder motors contactors . Any clues why the
software not working properly properly in the industry.

I will check with the control and power cable layouts

My 8051 is fully isolated from the rest of the onboard
24VDC powersupply vis DC/DC converter .

I have already decoupled my 89c51 Vcc GND pins with 10uF + 0.1uF and 220uF capacitors .

Please help me the controller is getting haywired...


Many thanks to all of you
Rick