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ehsab avatar image
ehsab asked

Generator issues with Quattro

Hi,

I've been using a 3-ph Quattro installation (Fronius AC-coupled) for a couple of months now and i love it. It works awesome.
Today i connected a 20kVA genset (Atlas Copco QES) and it didn't quite turned out the way i'd imagined.

The quattros noticed the genset and switched from grid to generator, and i thought all is well.

But almost immediately i noticed intermittent sounds from the quattros, and the amp meter on the genset jumped up and down (not much, but still not steady as i would liked).
Then after about a couple of minutes the quattros disconnect the genset and goes into inverter mode, and then back to genset again, and this process repeats itself.

It's a permanent installation in a house, its a permanent genset, i've got N+PE bridged in the genset, i've got N+PE bridged in my main AC-box and i've got the dynamic ground relay ON in the quattros.

LOM type B is used on both inputs.

Here's a screenshot of the vrm data:


Any thoughts on this problem? Have i overlooked something?

Kind Regards

ehsab

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1 Answer
Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·
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ehsab avatar image ehsab commented ·

No, i was looking for Quattro info, didnt occur to look in Multiplus which lack second ac in.

I’ve read through it now and have a couple of questions.

1. What transfer time do i get of i disable UPS function?

2. Is my best bet to enable dynamic current limiter? Or what would you have started with?


kind regards

Ehsab

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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ ehsab commented ·

Hi @ehsab

1. transfer time will be a couple of cycles at most, usually shorter.

2. no, dynamic current limiter is usually only needed for variable speed generators.

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ehsab avatar image ehsab Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

OK, then there's a big risk that my connected equipment will be powercycled, thats not good.

My generator is fixed (1500rpm) AVR (DSR) and of good quality. There shouldn't be any problems powering the (small) load i tested it with.
Any ideas to why it bahaved the way it did?

Kind Regards

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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ ehsab commented ·

@ehsab

we cannot guess for you why it disconnected, in the linked document multiple possible reasons are mentioned.

most equipment doesn't flinch from a couple of cycles btw.

so...

did you try disabling LOM?

did you raise the minimum voltage disconnect level? (important for when you stop the generator)

did you -try- without the UPS function?

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ehsab avatar image ehsab commented ·

@Daniël Boekel (Victron Energy Staff)

Will enabling Dynamic Current limiter reboot the quattros or will the load stay on?

Kind regards

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