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Lyndsay Cotton avatar image
Lyndsay Cotton asked

Genset frequency at 53.1Hz. Multi does not turn on

I have a client installation which is a pretty standard 48/5000 Multiplus 2 with ESS.

There is a changeover switch from a genset which is manually operated in the event of a prolonged national grid failure.

For all intents and purposes the Genset is installed as if it is the national grid.

Except, - The Multi does not recognise the Gender and sees the Grid as failed. The genset output is 23x volts and 53.15 Hz at no load

Out National grid code NRS097 stipulates the Multi to disconnect at low Hz 47 and high Hz 52

I suspect that due to the Genset output being 53.15Hz that the Multi recognises this as out of the acceptable parameters.

How can I fix this?

Can I create an identical Grid code but with high Hz cut off being say 54Hz?

Multiplus-IIgenset multiplus
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wkirby avatar image wkirby ♦♦ commented ·

What did the generator manufacturer say? I'd follow their advice on how get it fixed.

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Lyndsay Cotton avatar image Lyndsay Cotton wkirby ♦♦ commented ·

I tend to agree with you. Due to the long weekend and my limited knowledge of the Genset, I was hoping to rather just solve on the Victron side

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ Lyndsay Cotton commented ·

Maybe you can try to connect a small load directly to the generator?

A classic light bulb maybe. This could be enough to pull down the frequency.

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Lyndsay Cotton avatar image Lyndsay Cotton Matthias Lange - DE ♦ commented ·

Haha... Thanks. I tried that with the oven - nope (:

It is a 12KVa gender- dropped by 0.3Hz

My "lightbulb moment" was dashed into oblivion

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2 Answers
Paul B avatar image
Paul B answered ·

Hi Lyndsay, I would Guess and say that you are correct in that the Quattro is complying with the country code selected.

So one posiable option is to reduce the Generators RPM so that the hz goes below 52 Hz , (Thats if its NOT a inverter generator that is), As normaly the larger generators Hz is controled by its RPM to get the Hz Frequency correct, now some generators when under load don't hold there RPM well and then it becomes a balancing act between two high a frequency and too low a frequency


or MAYBE TOTALY and AT your discretion as you have to comply with your local countrys laws.

Change or try changing the country code to Other, and see if you then get a connection. or set it to NONE , this will all depend on what other assistants you are running and what they require as well. etc


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Lyndsay Cotton avatar image Lyndsay Cotton commented ·

You are correct wrt to the Genset settings rather being corrected. It has a very good quality alternator and due to its size, I doubt if the Hz will reduce by anything more than 0.3 Hz. I switch the oven on to its highest setting and the units Hz dropped by only 0.3Hz

As per @wkirby that is probably the answer but I was hoping to set the Multi parameters by SLIGHTLY modifying the Grid code parameters


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Paul B avatar image Paul B Lyndsay Cotton commented ·

the only way it will reduce (If its the NON inverter type that is) is to reduce the main engines RPM until the hz drops to below 52hz , It should be set to around 50hz anyway. It should be a easy adjustment on the engines injector pumps governer

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Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·
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