AVR R449 remote voltage adjustement
AVR R449 remote voltage adjustement
(OP)
Hello everybody,
I have one 2 generators 20KVA equipped with AVR R449 regulator, I want to make synchronisation with SPM-D21 from Woodward since the governor is also from Woodward ,
Now I have the voltage control coming from SPMD21 but I don't know where to connect exactly on my AVR

Attached , datasheet for AVR R449,
Thank you so much for your help
I have one 2 generators 20KVA equipped with AVR R449 regulator, I want to make synchronisation with SPM-D21 from Woodward since the governor is also from Woodward ,
Now I have the voltage control coming from SPMD21 but I don't know where to connect exactly on my AVR

Attached , datasheet for AVR R449,
Thank you so much for your help





RE: AVR R449 remote voltage adjustement
To use this with your voltage regulator you will need to add a motorized potentiometer compatible with the "three step" controller used by the SPM-D.
The R449 AVR usually uses a 470 ohm 3 watt potentiometer for a +/- 5% adjustment range.
Paragraph 1.3.4 on page 7 of your manual discusses the voltage adjustment, wire the correct potentiometer as shown (ST4)
Hope that helps, MikeL
RE: AVR R449 remote voltage adjustement
Thank you for your reply ,
I didn't order yet the SPM-D21 , Maybe I will order it with analog speed and volts bias
In this case , I'm still not sure where is the connection for both Ia and Ua in R449
Regards,
RE: AVR R449 remote voltage adjustement
Hope that helps, MikeL.
RE: AVR R449 remote voltage adjustement
Thank you ,
I'm just a little bit confused , I don't find this (- , +) terminals on the AVR R449 Datasheet,
Is it an external module to be used with R449 to enable remote voltage adjustment ?
RE: AVR R449 remote voltage adjustement
On page 7 is a better illustration of the option under paragraph 1.3.4 Voltage adjustment, it shows the J2 terminal strip and the ST4 option with a diagram of the external rheostat/potentiometer. As I remember you use the top terminal (the one connected to the wiper of the pot) to + and the lower terminal to -
Hope that helps, MikeL.