How to calibrate the AC Current Sensor Zero to 0

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mucwendel asked Mar 12, '21

How to calibrate the AC Current Sensor Zero to 0

Hallo,

I just installed everything and the system works great.

In order to read out my PV power (parallel to grid) I ordered he AC current sensor, connected it to AUX 1 and run the Assistent.

So far OK. It's displayed on the remote console and show values (tested with a 1000W heater)

DIP setting is all off (1.5kw on 230V)

But if I turn off he load, the reading is still above 80W.

Looking in the device it shows 240V 0A biu 84W ???

How to adjust the Zero Point?

Thanks for reply

Michael

Multiplus-II

screenshot-20210312-122534-chrome.jpg (326.0 KiB)

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Alexandra ♦ commented · Mar 13, 2021 at 07:58 PM

@mucwendel

The 87W is probably what the system is using to keep itself powered (self consumption).

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mucwendel Alexandra ♦ commented · Mar 14, 2021 at 06:50 PM

If the Sensor is laying on the table without any wire in it, it should show 0W and not 84W

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Answer 1 · 2021-03-14T06:46:07Z

Paul B answered · Mar 14, 2021 at 06:46 AM

Also it takes about a to 2 days for the Multiplus/Quattro to calibrate the Zero point, so have you waited that long , without any changes to the assistants.

it should settle down in time

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Answer 2 · 2021-03-14T18:50:59Z

mucwendel answered · Mar 14, 2021 at 06:50 PM

Hi Paul,

is there no parameter in the system to calibrate the sensor to 0W?

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Paul B commented · Mar 16, 2021 at 06:08 AM

No there is no setting that can be changed as far as I know, it will auto calibrate usually overnight when there is zero solar input, sometimes I have seen it take a few nights,

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Answer 3 · 2021-03-16T07:11:08Z

hermann answered · Mar 16, 2021 at 07:11 AM

I am using Acs712 sensor to measure Ac current. But the problem is I have to adjust it's zero point after every few seconds (about 50 seconds sometimes later).

The second problem is :

I am using 5V relays. so that whenever current value crosses the limit, the relay should operate. But the problem is whenever the relay operates, the sensor values automatically get change.

I am using this code to measure the current.

OneVanilla

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Paul B commented · Mar 16, 2021 at 07:17 AM

The sensor to use is CSE000100000 AC Current Sensor - Single Phase max 40amps

if you are using a different sensor then I cant help you as I have no idea.

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Answer 4 · 2021-10-16T16:53:11Z

njmcdirect answered · Oct 16, 2021 at 04:53 PM

For other types of sensor (hall sensors) zero offset has significant value and proper calibration must be performed before use. To calibrate sensor's zero offset set throttle down (cut engine) to minimize current consumption. Set proper ammeter range to get reliable measurement.

www.njmcdirect.com

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