Voltage overshoot problem In Machine

[coolronak9]

I am running a Tubing Machine. which have some controllers, drives and motors. machine is running perfectly fine till now. but when i measured my input voltage by multimeter. it shows more than 500volts for 3 phase supply. the main thing is when i measured this voltage without load it shows me perfectly good figure of voltages. but when i start my machine and measure this voltage it always shows more than 500v. so anyone knows problems and solution for this?
thanks in advance.

 

[KlausST]

Hi,

Without schematic, nominal voltages, measurement points, additional information...

What answer do you expect?

--> give related informations

Klaus