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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

Generator
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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 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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