I am using stepper motors to transport nanofibers in an electrospinnig setup. Howaver with the electric field (46 kV) I applied, the stepper motor drivers give an error and the motors do not work. I grounded the motor and drivers. I used UPS (Uninterruptible Power Supply). But the same problem persists. Why does a stepper motor exposed to an electric field put itself in protection mode? What can be done so that the driver does not give an error?