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Associate

Join Date: Jul 2009
Posts: 33

Three Phase Generator Fails to Produce Power

05/09/2013 11:07 PM

Hi

A 40kva perkins generator stops after 10 seconds when ever it was switch on, indicating undervoltage on the control board, we later find a shut circuit exitation windings, After rewinding it, fix, it still shows the same problem, we replace the diode plates still the same problem, can any one help in diagnosting the cause

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Guru
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#1

Re: 3phase Generator Fails to produce power

05/09/2013 11:09 PM

Yes, you're in luck!

Perkins Engines
They can help you.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#2

Re: 3phase Generator Fails to produce power

05/10/2013 4:02 AM

So it wasn't a shut circuit, rewinding or the diode plates.

  • Make sure there is fuel in the tank.
  • Change the fuel filter.
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Participant

Join Date: May 2013
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#3

Re: Three Phase Generator Fails to Produce Power

05/11/2013 3:04 AM

1. I guess after the rewinding of the exciter, you would have lost the residual magnetism. Flash the field winding with your starter battery 12VDC for a few seconds, ensure that the positive lead of the battery is flashed to the positive lead of the field winding and the negative lead to the negative of the field. After flashing connect back as usual and try again.

2. If no result from item 1, check the field rotating diodes if there are ok

3. Check the AVR

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#4

Re: Three Phase Generator Fails to Produce Power

05/11/2013 4:45 AM

Dear Mr. aishaamamariama,

The first 3 reply posts i.e No.1, 2 and 3,are relating/linking to Electrical Aspect.

You have referred "indicating undervoltage on the control board, we later find a shut circuit exitation windings, After rewinding it, fix, it still shows the same problem, we replace the diode plates still the same problem,............."

My view is once the Engine starts, whether it builds up voltage or not, the Engine SHOULD NOT STOP. If the Engine stops means, the Fuel Supply, Combustion related aspect, Choke in Exhaust pipe is possible. Pl. check in these points.

A similar post in CR4 as appeared about 20 days back and a variety of answers came from CR4 MEMBERS.

Pl. check it from that link and once you have identified the problem, pl. post here, what was the problem and how solved.?

DHAYANANDHAN.S

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#5
In reply to #4

Re: Three Phase Generator Fails to Produce Power

05/11/2013 4:43 PM

Insufficient oil or oil pressure may also cause it to shut down.

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Guru

Join Date: Dec 2010
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#6

Re: Three Phase Generator Fails to Produce Power

05/12/2013 11:49 AM
  1. Does a voltmeter confirm the "undervoltage"?
  2. Undervoltage detection can malfunction!
  3. Does your engine get to normal governed speed?
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Associate

Join Date: Jul 2009
Posts: 33
#7
In reply to #6

Re: Three Phase Generator Fails to Produce Power

05/12/2013 12:45 PM

Answers to your question.

1. Yes, but not a volt meter per say,,Its the control board. Design deep sea

2. It shows under voltage and the control board printed circuit board or you call it a cluster board

3. No, it does not, it shut down just after it detects no or little voltage I.E. seconds

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Guru

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#8
In reply to #7

Re: Three Phase Generator Fails to Produce Power

05/12/2013 3:01 PM

OK, it could all be due to the control board voltage detection disconnected or faulty.

Get an independent AC voltmeter.

"Flashing" the field has been suggested already - you should do it.

I would investigate the stop solenoid of the engine.

Disconnect the live wire to it, connect it back, through a switch, so that you can isolate the "stop" from the control board.

Be sure you know where the mechanical stop is - there is usually a lever on the fuel pump - and how to operate it (the engine will not start while it is moved into the "stop" position, it is usually spring loaded to "go" position). It is a good idea to have someone else ready to operate this stop at your signal or sign of trouble.

I am assuming the governor is simple mechanical unit in the fuel pump.

If you are happy the engine is OK and safe, then my expectation is that it would reach full speed before any voltage check is made by the control board. However, you say it does not reach a steady (governed) speed.

If you isolate the stop solenoid as suggested, the engine should reach full, steady, speed. You can throw the new switch to ON to stop engine if you are not happy.

At full speed, if you have flashed the field, it should give some AC voltage, say 5% to 10% rated, even with no field current.

If the AC voltage is low, the AVR may be faulty or not getting any voltage to power it.

It is best to have a DC voltmeter measuring field voltage, so you can see if the field is getting any power.

Finally, please think of all measures to ensure you, anyone else or the engine will not be damaged.

CR4 members are not on site and cannot be responsible for you.

Good luck,

67model

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#9
In reply to #8

Re: Three Phase Generator Fails to Produce Power

05/13/2013 5:19 AM

Dear friend

The controller (Deep sea) senses input faults and then commands to solenoid valve for trip.You would better check the causes of faults. good luck

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#10

Re: Three Phase Generator Fails to Produce Power

05/13/2013 8:14 AM

Has the local Perkins' Service Technician called in to see it yet, and what was the outcome of the visit?

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Users who posted comments:

67model (2); AHMAD REZA CHANGIZ (1); aishaamadumamariama (1); al_ebigwai (1); dhayanandhan (1); JWthetech (1); lyn (1); PWSlack (2)

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