Caterpillar AVR with part number 9Y8400 for generator model SR-4

[PiotrVA]

I have Caterpillar generator model SR-4, s.n.: 5NA07170 or 6DA04011 which is equipped with automatic voltage regulator (AVR) with part number 9Y8400 s.n.: KCN AB396.
I am looking for replacement for original AVR or at least some sort of specification i.e. rated output Amps and Volts!

 

[waross]

http://777parts.net/caterpillar/9Y8400-+REGULATOR+AS-AUTOMATIC+VOLTAGE/p1223217.html

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[IBRCAN]

The 9Y-8400 (VR3) regulator is obsolete. The direct replacement for this from Caterpillar is the VR6, part number 365-2076. Installation is similar. If you decide to go this route, let us know and I can provide more info.

 

[catserveng]

9Y8400 was rated for 240VAC sensing (nominal), and an output of 63VDC at 12 amps, capable of 90VDC at 10 amps field forcing.

IBRCAN has provided you the current CAT part number, if you buy from a CAT dealer, ask then for a copy of the Special Instruction that give you instructions on the conversion.

The Basler AVC 63-12 is a often used replacement as well, watch out for Chinese knockoffs, they have a poor service life in my experience.

MikeL.

 

[PiotrVA]

Thank You guys for the reply and an advice!
Actually i was planning to buy regular AVR which can give ~12A,

For example with the following specs:
Type: UNIVERSAL AVR
Voltage Set-up:The voltage set up when the remnant magnetism greater than 4V25Hz
Input power Supply:AC 160~260V 50/60Hz
Maximum Output: DC 15A 90V(when the voltage reaches AC 207V)
Frequency Compensation:Built-in low speed protective circuit.
Regulation factor:less than 1%

links:

http://cema.wozaonline.co.za/_item?item_id=5732910535540736

Can you please give me an idea if this AVR will work for CAT SR-4 350kVA alternator?

Ps. Can someone explain the difference between S-TYPE,LS-TYPE,UNIVERSAL AVR?
Below link has a list of available AVRs i can choose from...

http://cema.wozaonline.co.za/AVR27S

Which one would be applicable in my case?

Thank you in advance!

 

[IBRCAN]

These appear to be the kind of Chinese knockoffs that Catserveng warned of. Just by looking at the pictures, I can tell the S-type are knockoffs of Stamford AVRs, and the LS-type are knockoffs of Leroy Somer.

The universal AVR will likely work if these gensets are running stand-alone. Do these units have PMGs or are they self excited? To determine suitability for parallel operation, we would need more info.

Personally, I would stick with a high quality Cat VR6 or Basler AVC 63-12. Yes they are more expensive, but will likely be more reliable and durable.

 

[PiotrVA]

This alternators will be installed in separate stand-alone gensets so there won't be need to synchronize them!
Does PMG stands for "Permanent Magnet Generator"? In this case is it a part of alternator or is mounted as separate part of the genset? In the workshop i have only stripped alternators....

 

[waross]

Yes PMG is Permanent Magnet Generator. Typically a small alternator mounted on the outboard end of the non-drive-end bearing. The PMG supplies power to the AVR. These give better performance than self excited generators. The PMG is a factory installed option.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[PiotrVA]

Thank You will have to check if PMG is a part of those two alternators i have....