gen set exiter/field regulator

[videoeng1]

I have an American Marc/Kato gen set with a bad exiter/regulator. Unit is 35 years old, looking to replace it with solid state circuitry. Does anyone have generic schematics for this? Field voltage needed is 50-70 volts DC at approx. 5A to generate 120/208 3 phase. Static field resistance is approx. 10 ohms. I'm not sure what the min. exitation voltage is, but unit has 24 volt battery. I can adapt any usefull designs to work, just need a head start.
Any help will be greatly appreciated.
Chris

 

[busbar]

Posssibly:

http://www.basler.com/downloads/sx6bull.pdf

 

[jbartos]

Suggestion: Also, try
Kato Engineering, Inc.
P.O. Box 8447
Mankato, MN 56002 8447
USA
Tel: 507-625-4011
Fax: 507-345-2798

http://www.kato-eng.com

 

[videoeng1]

Thanks busbar and jbartos for the info. I found a AVR at Basler that will work, but it is very expensive considering the gen set it would be used for. kato had some old design specs, there AVR was also out of my range at $700. A bit much for my old 12kva gen set. I am hoping to build something myself, I have a ton of spare boards and parts lying around. Some exact figures from Kato: No load field voltage for 208v= 29.5V@2.35A Full load 208V@33A= 62.5V@4.95A field. Exact field resistance is 10.18 ohms. Each phase winding is 0.410 ohms @ 27 deg. C ambient.

 

[jbartos]

Suggestion: The AVR is essential a negative feedback loop usually using electronic designs.

 

[peterb]

If you don't need an automatic regulator (steady load?), then any adjustable DC power supply that can give you 4.95A at 65V can be used (this can be as simple as a rheostat + transformer + full wave rectifier). Adjust manually for the desired generator AC output voltage.
To create an automatic regulator, start with a design for a variable DC power supply and add a feedback loop to compare generator actual AC output voltage to setpoint. The info available at Basler should point you in the right direction.

BTW, did you look at the Basler AVC series regulator? Not sure of the pricing, but this range should be economical.

 

[jbartos]

Suggestion: Visit

http://www.thomasregister.com

and type Regulators: Generator Voltage under Product or Service which will return 23 companies to inquire about an inexpensive AVR.