600kVA Kholer Generator, Under Frequency

This sounds like a governor adjustment or fuel delivery problem. (The voltage regulator does not control frequency.)

Minor editorial point: Kohler.

...and should form the subject of an immediate discussion by telephone with Kohler's technical helpline, particularly if it is still within its Manufacturer's Warranty Period.

I do not have the instruction manual

You need to find it (or download another copy off the internet).

This is not some Robin 1kVA portable generator that can be fault-found and fixed with a screwdriver and a suitably-sized hammer.

Is this one of the ones you mentioned looking at buying last year? If so, is it still under warranty (or did you buy second-hand)?

Jack, this is another one and it is no longer under warranty

http://www.kohlerpower.com/industrial/technicaldocuments.htm?sectionNumber=13261&nodeNumber=3&contentNumber=301
Location

1. How can I contact someone at one of your offices?

There are a couple of ways you can contact us. You can go to our Sales and Service locator and find an office closest to you, visit our Contact Us page or call us at:

• United States/Canada - 800-544-2444
• Asia Pacific at +65 6264-6422
• Europe - Middle East - Africa +33 (0) 1 49 17 83 00

http://www.kohlerpower.com.sg/common/pdfs/G12-313_Industrial%20Large%20Mits%20Bro.pdf

Get Kohler on the line, and bother us, when that line of inquiry is exhausted.,

First thing first just to assist you, check your oil level and the quality. If necessary replace with new one of same type if generator has been sitting idle for some time.This includes the oil filter. And then check your fuel system, including the fuel pump ,lines and filters. Make sure fuel is getting thru. Check also the cooling system. Give a start when all these are right.

AVR can only be changed when the generator engine is running but there is no voltage at the output terminal, or either, the output voltage is not constant. The governor can also be checked if there is no change in power output even though adjusted.

Yes, do get more information from the supplier to help you now or in future.

The first thing we did was change oil,fuel filters.

It's an engine problem, not a generator problem. Maybe a dirty air filter or fuel filter or contaminated fuel.

Rixter, I have not changed the air filter. I will changeit today. About contaminated fuel, could it be water in fuel?I will change that today too. Page

Kohler gensets of many Kva ratings have an issue that a lot of people overlook. The magnetic pickups that are installed in the alternator housing go south occasionally. Even the Kohler manuals are vague on this part of the system. I spent 3 days a few years ago troubleshooting similar problems. Give this one a check.

I will check the magnetic pick up today. I tested the voltage, it gives 341v , 44 hzs, between phases instead of 380 volts and 50 hzs

check the output voltage if Magnetic Pick-up (AC) and actuator (DC )..

Dear Mr.page,

Pl. clarify whether the engine has reached full speed, excitation given and voltage is built up and then the engine stops/shuts on its own. If so the problem could be on electrical side.

Other wise engine stopping means - the fuel supply and fuel quality aspect is the problem. It can be due to choked filter, fuel mixed with water etc. Governor may not act asper the need for regulating speed. Pl. post more data.

DHAYANANDHAN.S

Dear. dhayanandhan I tested the voltage before self shutting down, it gives 341v , 44 hzs, between phases instead of 380 volts and 50 hzs

Dear Mr. page,

In my opinion, the problem is narrowing down to the Mechanical Side of the Engine.

The Reasons, probably be:

1.Choked Fuel Filter and hence no sufficient/required Fuel Flow. Check this.

2. Leaky Piston Rings, hence poor Compression Pressure - Leading to Improper Combustion of Fuel. Check this, by doing the the motoring test for measuring the COMPRESSION pressure - for this pl. put a fully charged Battery and remove one Fuel Injector from one cylinder and fix a good Pressure Gauge to it and crank the Engine by and measure the Pressure and note.

Pl. carry out this exercise for other cylinders one by one and crank the Engine and note the Pressure. If the Engine is designed for Compression Ratio of 18:1, - then the motoring Compression Pressure should be 280 psi. (or) 19.71 Kg/cm^2. Up to 260 psi (or ) 18.3 Kg/cm^2 is ACCEPTABLE. Less than this pressure calls for over-hauling of Engine.

If the Engine is designed for a Compression Ratio of 22:1, then the Motoring Pressure should be 303 psi (or) 21.3 Kg/cm^2. Up to 260 psi (or ) 18.3 Kg/cm^2 is ACCEPTABLE. Less than this pressure calls for over-hauling of Engine.

3. Choked Air Filter or TURBO-CHARGER not effectively drawing the air. Check this.

Pl. post the information how-it was solved, to this forum and through CR4 PERSONAL MESSAGING.

DHAYANANDHAN.S

Dear Mr. Dhayanandhan I will go through all that today and let you know. Thanks, Page

Sir dhayanandhan.

disregard the #2 because if the piston ring is leaky the engine will exprience blowby, during power stroke the force or Pressure will leak on lower parts of engine causes the oil to leak on breather or oil filler cap..

Frequency is set by engine/generator speed, the RPM's, not the voltage regulator. You cannot synchronize the generator with the line/grid without synchronizing the two frequencies. If it is tripping without your trying to synchronize the two, just coming up to speed and then after a minute without load, just tripping with that warning, then it probably could be something in the governor's feedback loop that senses that the system frequency is inconsistent with the generator speed or output.

Mr. page

what speed governor and controller are used on that genset..

try to adjust the speed @ speed pot in speed governor..