Replacing MX 341 AVR with MX 321 AVR
Replacing MX 341 AVR with MX 321 AVR
(OP)
hello everyone,
The problem I am having is that I replaced a Stanford MX341 AVR with a MX321 AVR. The 341 is a good working avr, but the genset is going to be synchronize with two other gensets with 321.This is why we replace the 341 with the 321.The problem I am having with the new avr is that the voltage is not coming up to nominal voltage, its around 365 v (480 nominal).
This is what I think is wrong but cannot see how it can affect the regulation, so hope you guys can help.
The 341 is a two phase sensing avr and the 321 is a 3 phase sensing avr, and the manual say to use a open delta isolation transformer and I did not, instead I place the sensing at the mid point of the series wye connection.the nominal voltage for the genset is 480 V 60 hz and the avr is power from a PMG(120 hz).
The problem I am having is that I replaced a Stanford MX341 AVR with a MX321 AVR. The 341 is a good working avr, but the genset is going to be synchronize with two other gensets with 321.This is why we replace the 341 with the 321.The problem I am having with the new avr is that the voltage is not coming up to nominal voltage, its around 365 v (480 nominal).
This is what I think is wrong but cannot see how it can affect the regulation, so hope you guys can help.
The 341 is a two phase sensing avr and the 321 is a 3 phase sensing avr, and the manual say to use a open delta isolation transformer and I did not, instead I place the sensing at the mid point of the series wye connection.the nominal voltage for the genset is 480 V 60 hz and the avr is power from a PMG(120 hz).





RE: Replacing MX 341 AVR with MX 321 AVR
Bill
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"Why not the best?"
Jimmy Carter
RE: Replacing MX 341 AVR with MX 321 AVR
RE: Replacing MX 341 AVR with MX 321 AVR
Is the under frquency roll off adjusted correctly?
Have you checked obvious things such as correct engine speed, rectifier diodes ok, PMG voltage correct?
RE: Replacing MX 341 AVR with MX 321 AVR
RE: Replacing MX 341 AVR with MX 321 AVR
RE: Replacing MX 341 AVR with MX 321 AVR
I finally got an open delta isolation transformer and connected it to the AVR,every thing work as it should, voltage came up and it synchronize with the other two generator.Thank you guys for your inputs.