replacing Stamford series 4 AVR with SX440 in old Stamford C244B generator

If u can still remember the Stamford connection, note the following for the new AVR. K1,K2 are for external voltage regulation.1,2 are for open link 60Hz and close link 50Hz. Note that XX and X is usually what u know as exiter out put. P2 and P3 are for L1 and N on the generator out put terminals.

Note: if u can read circuit drawings, turn the board and read the circuit, that will further help u. I still have some doubts about p3 and p4 which of them should be connected to the neutral of the gen, but it is same as in stamford. leave other links open. I have the manual and will send it to u latter, am currently out of my station.

Kamah D, Abuja, Nigeria.

Hi

Just live the links on K1-K2

P2 AND 2 goes to the main stator connection 8

P3 AND 3 goes to the main stator connection 7

P4 live it blank

XX is connected to the Exiterstator F2

x is connected to the Exiter stator F1

A1 AND A2 GOES TO POWER FACTOR CONTROLLER

These are the connection for SX440 AVR

Rgds

Aisha

Thank you all for your help.

Aisha, I can clearly understand what you have said about the sx440 connections. What I am wondering is if you look at the terminal diagram of the old series 4 board. Following your instructions it leaves me with leads which used to connect to the old board called p1,and 1 and now p4(as you said) with no connection. Can I just leave them off? I did read that p1 is a ground and not needed with the newer boards, but do not know what the function of the wires 1 and p4 are from the old board? Just don't want to blow the new board up so am trying to get it right.

Any help appreciated

greg.

Greg

Lets go this way, now the old AVR had ten [10] terminals with only nine [9] terminals connected. Now I need to know the cables connected to each of the nine [9] terminals were they come from or were they supply.

for instance....AVR XX or negative [-] terminal is connected with cable comming from Exiter stator cable marked F2

AVR X or positive [+] terminal is connected with cable comming from Exiter stator cable marked F1

This is what I want you to furnish me with, I am sure we will fix it

hope to hear from you

Rgds

Aisha

aisha

That is where my problem lies.I have no information and am unable to track to f1,f2 etc. all I have is the leads clearly marked with the labels for the old series four board.

I was hoping a reader may have had a schematic of an old series four board like mine and from that be able to interpret which leads I could safely leave off. I am very tempted just to connect up to the sx440 as you have mentioned and tape up the p1,1 leads from the old board. I did wonder if the old board "sampled" voltage from three outputs for voltage regulation whereas this board only samples two and p1,1 from the old board are redundant? sorry I'm not more helpful.

Thanks for your efforts

greg

Greg, thers is somthing I will want u to undrestand about AVR. Any AVR that matches the capacity of ur genrator can be used. The most important things to consider are the imput voltage and exitation out put voltage of the AVR in question. The Stamford/Markon AVR in question is used in several mordel generators as good replacement. I prefer using them since it is very eazy to repair. when used in other generators, p4 is always removed and other unused terminals are linked together. If ur generator is small U can even use a Serial 6 AVR with only 4 terminals to connect; the exiters and the generator terminal voltage of 220V.

Take care

Dickson Abuja, Nigeria.