EM64XX THD issue
 
        Goals and Symptoms   

        Summary
        EM64XX THD issue in Meter display and through communication.
 
        Symptoms
        The EM64XX power meter shows current THD% as ----in the meter display and -999 through communications.

        Causes and Fixes       

        Cause
        1. When the secondary current is less than and equal to 10% or greater than and
            equal to 110% of CT ratio.
        2. When frequency is greater than 65Hz.
 
         Resolution
          In order to get the THD reading proper we need to maintain

          1. Secondary current should be greater than 10 % and should be less than 110% of CT ratio.
          2. Frequency should be less then 65 Hz. 

           All the necessary information is available in User Manual and QSG.
 
 
 

Released for: Schneider Electric Egypt and North East Africa