Hi guys I have an Arduino connected to a load cell (amplified with the typical INA125P circuit) to weigh objects passing through a conveyor belt, but when I turn the trifasic motor and speed regulator the Arduino crashes (stops meassuring and needs to be restarted), how can I protect the Arduino from static? I've rechecked grounds, but still when I turn the machine on the arduino crashes. Any help would be much appreciated!
You first need to establish what is happening - you could have surges on the power supply to the Arduino, or inadequate protection from noise on signal cables.
In general in an industrial environment everything is shielded cable and great care is taken to reduce noise-pickup since there is so much noise around heavy electrical machinery.