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sven-nurber avatar image
sven-nurber asked

Quattro disconnect of AC-out-2 while on Shore Power ?

Hi Forum. This QUATTRO 5KW/24V/240V (QUA245021010) is disconnecting AC-out-2 intermittently. The triggering event seems to be an AC compressor starting current although it sometimes will run with the same compressor and sometimes even a second one. The Quattro nameplate says 45-55 Hz input although the manual says 45-65 Hz input ? Shore power is 211V 60Hz (120/208V). I've attached a couple views of waveform ( full-scale and close-up ) that might give insights into the cause ? Blue signal is AC-in-1 at Quattro, red signal is AC-out-2 from Quattro, green signal is AC-out-2 current. This boat was manufactured with EU sourced Victron for sale in the US which technically leaves me with no support other than this forum ?


Ripple Quattro disconnect with x1 AC compressor & pump load.pdf

Ripple Quattro disconnect with x1 AC compressor & pump load closeup.pdf

MultiPlus Quattro Inverter Charger
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3 Answers
jwfrary avatar image
jwfrary answered ·

@Sven Nurber and @DeVerm Dynamic current limiting is only for use with inverter type generator sets and won't solve your problem in this case. Its designed for a generator which needs to rev up to speed to meet a higher load. - so not for shore power or fixed speed Genny's.

I would think its far more likely the voltage is dropping as the AC load comes on causing the quattro to drop into inverter mode briefly and therefore AC2 is going off and would explain the funky frequency/voltage curves.

out of the box the voltage limits are often set quite tight, you might want to try dropping the AC disconnect voltage to 180-190v and see if it solves your problem.

You could also alter the sensitivity of the quattro by turning off the UPS setting. - But try opening up the voltage settings first.

You will need a Mk3 device and Ve.configure.

In terms of frequency, the quattro will accept multiple input frequencies. The output frequency is selectable in the ve.configure. Obviously this needs a bit of thought as to what you desire out of the sockets!

Hope that helps.

If in doubt, you can always post a screen shot or your config file.


Screen Shots of where to look

screenshot-2020-11-10-093325.png

screenshot-2020-11-10-093414.png


screenshot-2020-11-10-093325.png (40.0 KiB)
screenshot-2020-11-10-093414.png (76.0 KiB)
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sven-nurber avatar image sven-nurber commented ·

Thanks. Yes, "AC low disconnect" was the setting causing the problem.


Sven

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jwfrary avatar image jwfrary sven-nurber commented ·

@Sven Nurber glad you got it sorted. Happy sailing (or steaming)

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deverm avatar image
deverm answered ·

Try Dynamic Current Limiting. If it is caused by startup surge this will probably fix it.

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sven-nurber answered ·

Thanks for reply deverm. AC-in-1 is shore power (grid) in this installation ( manual suggests generator for this input ) so enabling this setting would PowerAssist AC-in-1 ( lessen the draw on grid ) which isn't our problem. If I'm understanding the setting ? But perhaps you are suggesting making sure it isn't on. I'll take a peek.


Sven

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deverm avatar image deverm commented ·

First try switching off the UPS function, like described by @Jwfrary. If that does not work and the acceptable input range is okay as well, then do try to enable the dynamic current limiting function. This is not a Power Assist function.

It is caused by a short fall back to inverter mode which leads to a loss of power for 2 minutes on out2. For us we had to go to Dynamic Current Limiting to prevent this, even though the incoming power was from a fixed rpm Northern Lights diesel genset.

the -real- cause may lay deeper but while diagnosing it this setting will keep you going. For us the problem may be caused by wiring. I suspect even DC wiring too long leading to high AC ripple. We are building a new system around a lithium battery with short wiring so we’ll find out soon. In the mean time the setting I suggested fixed it 100% and I see no negative in trying it.

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