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JONE
Member

Join Date: Oct 2014
Posts: 5

800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/11/2014 1:01 PM

dear all,

could any body give me some idea on why our 800 kva caterpillar gas engine 3500 speed is unstable with no load(1600 rpm to 1300 rpm)frequency(46HZ-54HZ)problem started when we stop it for oil change.

history,

acuator replaced by new one

carbuerator replaced by new one

linkage checked ok

magento replaced

trubo charger cheked ok

2301A speed control woodwoard replaced

magentic pick up checked ok

alteronic box replaced

gas regulator checked ok

I wish anyone of our members can help us with his ideas and solutions.

thanks
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Tornado
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#1

Re: 800 kVa caterpillar Natural Gas Generator Unstable Frequency

10/11/2014 2:02 PM

Does the "problem" persist when significant load is applied?

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Anonymous Poster #1
#2
In reply to #1

Re: 800 kVa caterpillar Natural Gas Generator Unstable Frequency

10/11/2014 2:04 PM

I think some bad spells have been cast on this generator.
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Crabtree
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#3

Re: 800 kVa caterpillar Natural Gas Generator Unstable Frequency

10/11/2014 5:14 PM

Yes. Caterpillar can. Get on the phone and talk it through with them.

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otha
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Join Date: Oct 2008
Location: Meherrin Virginia
Posts: 319
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#4

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/12/2014 8:21 AM

Can you relate the problem to cold or hot lubricating oil at startup?

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StandardsGuy
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#5

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/12/2014 11:19 AM

It could be an air leak. Carburetor bolts may not be tightened down properly or intake manifold bolts. Did the problem exist before the carburetor was changed?

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JONE
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Join Date: Oct 2014
Posts: 5
#6
In reply to #5

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/12/2014 11:47 AM

Hi Standardsguy,

thanks for your response,the problem exist before carburetor was changed.
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StandardsGuy
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#7

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/12/2014 11:57 AM

Wrong oil filter used, restricting oil flow? Too much oil put in? Bad PVC valve? Was air cleaner changed when oil was changed?

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JONE
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Join Date: Oct 2014
Posts: 5
#8
In reply to #7

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/12/2014 12:16 PM

Hi,

Yes,air cleaner was changed.Sometimes speed becomes stable for short time and back to unstable situation
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TonyS
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#9

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/12/2014 3:58 PM

Duplicate thread.

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Catmandu
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#10

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/13/2014 3:04 PM

Why are you running it at the speeds you listed?

It's either 50 or 60 hz. Which one is it?

Does it stabilize when a load is applied?

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Trini
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Join Date: Feb 2012
Location: Trinidad & Tobago
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#11

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

10/13/2014 6:12 PM

The oil in the actuator sometimes need to be flushed and could lead to some instability. As a result the 2301 may have been adjusted to compensate. When the oil was changed, some instability may be introduced and led to a replacement of the actuator and the 2301. We just to tune the new 2301.
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diegoavaj
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#12

Re: 800 kVa Caterpillar Natural Gas Generator Unstable Frequency

01/18/2015 2:29 PM

Binding linkage
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Users who posted comments:

Anonymous Poster (1); Catmandu (1); Crabtree (1); diegoavaj (1); JONE (2); otha (1); StandardsGuy (2); TonyS (1); Tornado (1); Trini (1)

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