Dear Friends ,
I have an application where i am using Two ADE7758 to measure 3 phase voltages for Mains , Generator etc.Both channels are different and are fed with isolated supplies of 5V dc.
SInce in the design The neutral is made common to the ground.I am facing the following issue:
In the System when the contactor switches on/off to pass different phases of mains and/or dg .The Voltage reading on the display freezes for a phase . Sometimes it sticks to zero and doesnt rise ,and sometime it freezes to last hold value say 235V and doesnt go to zero even if the source is at 0 v AC.
If we remove the supply of the Ic ade7758 and apply again ,The reading becomes correct.
Please suggest what could be the possible solution to this.and Plz elaborate any possible causes.