Answer / k.prakashchandra

May be due to over excitation.If you are using AVR ,run on
manual channel to check the PLC and auto channel

Answer / nithi

mr.prakash answer is correct........over excitation of one
DG set & under excitation of another Dg set will lead to
this type of problem.so, check both DG set AVR circuitary
(voltage set value).

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