Some common reasons are :
1). Load applied to generator exceeds capacity, typically would cause machine to slow down, drop frequency and voltage typically cause exhaust black stacking and depending on the overload and protection settings could cause machine to stall.
2). AVR Voltage gain set too low to respond to load being applied.
3). If AVR feedback is from generator bus VT and voltage dips too far, all excitation could be lost and would typically result in an undervoltage and overcurrent trip.
4). Speed control gain set too low to respond to load being applied.
5). Mechanical issue such as failing turbo unable to provide enough air of high enough pressure while taking on load which will cause machine to slow down and in some cases stall on high load application with sufficient reduction in speed voltage will also lower as well as frequency. In this condition you'd probably also see exhaust black stacking.
6). Mechanical issue such as fuel injection clogged or fuel filters clogged causing the machine to be under fuelled to handle load application and may cause machine to slow down, which in turn would drop Hertz and Volts.
7). There's a whole truck load full of other reasons why this could happen.
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Chandrshikar
I have a three phase connection for my duplex house and hence the ACCL was badly burnt due to sudden surge from Electricity pole. Hence as the cost of the ACCL was high I replaced with a manual Changeover switch. But the output is not controlled and as it is direct from the generator, due to fluctuations in the Generator output My appliances are blowing out one by one due to uneven voltage. Five LED tubelights, microwave was burnt though not switched on, and many other appliances are burning out. Hence I have now disconnected the Generator supply to my house.
Any suggestions how to control Generator output fluctuations as it is directly from generator to my house.
My email Id is cbagare@gmail.com
Please provide cost effective solution.
Thanks in advance.
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Thanks
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This is a peculiar beaviour and I have not found a solution. The load removed is a motor (inductive load) running on a soft starter.
Any suggestions?
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email: eberedida@gmail.com
Please I need your help
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Low power single phase alternators often have simple excitation systems that use the output of the alternator to provide the field current, and are incapable of supplying high inrush current loads.
Small generators like this draw their excitation power from the output of the generator, have no AVR, nor any Boost capability; i.e., their voltage falls as the load increases. The size and type of load makes a huge difference in the generator's ability to maintain the voltage in an acceptable range when equipped with a simple excitation system that operates open loop.
Where did the excitation power come from, the generator terminals, or a dedicated extra winding in the stator? If it comes from the output terminals, then the "voltage regulator" is usually a LM part number whose job it is to limit the voltage to the field under no/light load, but it can do nothing to support the terminal voltage as it falls due to large inductive loads being applied.
A separately derived excitation source will indeed attempt to raise the excitation level to the current limits of the field/stator winding, but such sophistication is usually not found in consumer level single phase generators due to the cost factor.
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what would be reason..
Give me any idea
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The problem was
Generator no load and with load also voltage is going down
From AVR I increase the voltage up to 385v. Still same no load also voltage is going
Frequency ok
What would be reason
Pls e mail me..
Mizexy1@hotmail.com
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Pls. what can i do to my generator that has only 120V output to get 220V?
Thank you.
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Sirr Please...!!!!
Give the Reason of voltage reduction of alternator on Load.
Give sOme important Reason's..
I Shall be very thankfull thankfulll.
MY Mail is : (Samubaid31@gmail.com)
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my generator 110 kva .. shutdown after High frequency with higher Tpm .. I adjusted fuel pump throttle after that also i am getting same fault .. pls help me to get rid of from this breakdown
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Tahir Mohammad Hassan
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I have a generator with a total running life of about 700hrs. It has been working perfectly okay until last night when it suddenly developed fault.
Normally, it carries all my lighting bulbs & other appliances (including refrigerator). But as it is now, it can no longer carry the refrigerator. Once I switch it 'on', the voltmeter drops to zero and every light goes 'off'. If switch 'off', the voltmeter goes back to 230v and every light comes 'on' .
I have try putting everything 'off' and put 'on' only the refrigerator but the same thing happens.
In summary, the voltmeter stays at 230v while the generator is running on lights and small appliances but drops to zero once I add bigger appliance like my refrigerator. Thanks in advance.
Email: thywillassociates@yahoo.com
Model: Lutian, LT3600 EB8
Rated output: 3.5KVA
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vijay
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This is Ramakrishna
I have mahindra 15kva 3 phase diesel generator
While power gone we will switched on generator
We have telecom load on generator
After half an hour running generator suddenly it's engine slow &voltage drops suddenly after that our contactors open load disconnected on generator
Again voltage raised to 440volts
What would be the reason for this
Please explain me how can I know avoid this
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What. Is problem
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Motor runs fine and starts right up. Any ideas on what might be causing this problem.
This was during our 14 day power outages in the Sonoma Valley fires.
Thanks
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I need an aswer to this question: What is the probable causes that frequency not come up after geneator start.
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Huzaifadude23@Gmail. Com
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When i turn the change over switch back to mains they work as normal
I had a sparly check it out and he find 400 volts between one set of phases and the other two cycle from 200 to 400 volts and you can see that on the multi meter voltage between phases 2 & 3 going up and down continually.
It has him stumped so im doing the research for him
Any ideas please
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Stephen
I have this Sdom's Generator 440 kva that the stator winding breasted, after rewinding the voltage cant go up to 415v ,voltage now is 339v and the main rotor winding also heat. I need your help.
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just voltage drop . it goes to 59 or 60 volts total on each leg .
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But the contactor in the pump control board is running interchangibly on and off with in a second sothat the pump can not run how can i solve this problem.
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I'm interested in getting a generator like a Champion 5.5KW dual generator. As you know, it's 240 VAC is two phase. I also want a 230VAC, single phase arc welder. I've seen people weld, using L14-30 to 14-30 adapter with no issue. I think, however, that would create an unbalanced load and, eventually, damage the generator. What are your thoughts, sir?
Thank you,
William Reynolds
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My main question is why is there such a voltage drop when the frequency did not drop nearly as much. I would think the prime mover is still able to carry the load since it is moving at the proper frequency. What am I missing?
Northern Lights 30kw M9444W
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While excited it ran a drop light and fan normally. Soon as I let go of the switch that manually excites I lose electricity. Diesel power unit functions properly.
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Evone
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zekariyas
Ashok