Autor Thema: 4-20mA Inputs to E4 UC 12RC1 operating on 24VAC  (Gelesen 619 mal)

Offline Simon Tyrcha

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4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« am: November 04, 2022, 23:15:02 Nachmittag »
Is it possible to use 4-20mA inputs on an easy E4 UC 12RC1 which is supplied by 24VAC? Thank you!

Offline Konni66

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #1 am: November 07, 2022, 16:31:48 Nachmittag »
Hello Simon,

this should work if You use a 500 Ohms resistor to convert 4..20 mA into 2..10 V.

500 Ohms resistors are available exactly for this usage.
Or use a 499 Ohms resistor from E96 series.

Have a look at the attached picture.
Notice: You must connect 24 VDC-sensor-GND to easy's 24-VAC power-supply's 0 V.

Greetings
Konni
Die Programmierbeispiele sind zu Schulungszwecken gedacht. Trotz sorgfältiger Erstellung und Funktionsprüfung können Fehler nicht ausgeschlossen werden. Daher erfolgt die Verwendung der Programmteile in eigener Verantwortung.

Offline Simon Tyrcha

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #2 am: November 07, 2022, 17:07:50 Nachmittag »
Vielen Danke!!!

Thank you!!!

Offline Simon Tyrcha

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #3 am: November 07, 2022, 17:09:19 Nachmittag »
Hello Simon,

this should work if You use a 500 Ohms resistor to convert 4..20 mA into 2..10 V.

500 Ohms resistors are available exactly for this usage.
Or use a 499 Ohms resistor from E96 series.

Have a look at the attached picture.
Notice: You must connect 24 VDC-sensor-GND to easy's 24-VAC power-supply's 0 V.

Greetings
Konni



Vielen Danke!!!

Offline Simon Tyrcha

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #4 am: November 07, 2022, 20:34:58 Nachmittag »
Hello Simon,

this should work if You use a 500 Ohms resistor to convert 4..20 mA into 2..10 V.

500 Ohms resistors are available exactly for this usage.
Or use a 499 Ohms resistor from E96 series.

Have a look at the attached picture.
Notice: You must connect 24 VDC-sensor-GND to easy's 24-VAC power-supply's 0 V.

Greetings
Konni


Please excuse my email inquiry regarding how to attach images. I have found the function to do so.

Can you please tell me if my diagram in the attached image is correct based upon your advice?

Thank you!!!

Offline Konni66

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #5 am: November 09, 2022, 09:58:36 Vormittag »
Hello Simon,

I think, it will not work. What about the DC-GND? It's connected to ??? (space)

Please show the sensor's data sheet to us.

Greeetings Konni

Die Programmierbeispiele sind zu Schulungszwecken gedacht. Trotz sorgfältiger Erstellung und Funktionsprüfung können Fehler nicht ausgeschlossen werden. Daher erfolgt die Verwendung der Programmteile in eigener Verantwortung.

Offline ELWMS

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #6 am: November 09, 2022, 14:35:02 Nachmittag »
Hallo Simon!

I think it won't work. The analog input has the same internal reference point as the supply voltage. However, the UC device is operated with AC. the reference point is therefore not stable. The analog input works with 0-10VDC. It is not clear from the technical data whether mixed operation is possible. An EASY-E4-DC-6AE1 will probably have to be used because the electrical isolation is there.
12DC GND has to be connected somewhere. This is the reference point for the 12VDC.

But if an EASY-E4-DC-6AE1 is used, the supply voltage for the extension must be 24VDC, or would 12VDC also work?

Gruß,

ELWMS

SRy, mein Englisch ist etwas eingerostet...
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Offline Konni66

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #7 am: November 09, 2022, 14:55:00 Nachmittag »
Hello,

EASY-E4-DC-6AE1 does not work at 12 VDC - data sheet shows 24 VDC only.
The DC-GND must be connected to AC-0V.
Otherwise the DC (current from sensor over 500 Ohms) input voltage has no reference point.



« Letzte Änderung: November 17, 2022, 10:22:45 Vormittag von Konni66 »
Die Programmierbeispiele sind zu Schulungszwecken gedacht. Trotz sorgfältiger Erstellung und Funktionsprüfung können Fehler nicht ausgeschlossen werden. Daher erfolgt die Verwendung der Programmteile in eigener Verantwortung.

Offline Simon Tyrcha

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #8 am: November 09, 2022, 18:37:40 Nachmittag »
Hello Simon,

I think, it will not work. What about the DC-GND? It's connected to ??? (space)

Please show the sensor's data sheet to us.

Greeetings Konni

 :)Of course you are correct!!!

:-[ I am new to working with analog devices, as you can likely tell, and misunderstood your diagram. I see now where the resistor in your diagram is going to ground. :-\

I will attach photos of the power converter I am using, and a copy of the sensors data sheet, as well as an updated version of my diagram for your consideration.

Thank you very much for your support.
« Letzte Änderung: November 09, 2022, 18:39:20 Nachmittag von Simon Tyrcha »

Offline Simon Tyrcha

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #9 am: November 09, 2022, 18:45:35 Nachmittag »
Hallo Simon!

I think it won't work. The analog input has the same internal reference point as the supply voltage. However, the UC device is operated with AC. the reference point is therefore not stable. The analog input works with 0-10VDC. It is not clear from the technical data whether mixed operation is possible. An EASY-E4-DC-6AE1 will probably have to be used because the electrical isolation is there.
12DC GND has to be connected somewhere. This is the reference point for the 12VDC.

But if an EASY-E4-DC-6AE1 is used, the supply voltage for the extension must be 24VDC, or would 12VDC also work?

Gruß,

ELWMS

SRy, mein Englisch ist etwas eingerostet...

Vielen Danke! Mein Deutsch ist auch sehr rostig!!! Aber besser als mein verstandnis von analog circuits!!!

Offline Konni66

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #10 am: November 10, 2022, 08:34:12 Vormittag »
Hello Simon,
your diagram looks good to me. That's the way I would try.

PS:
Remember, the resistor should be placed near easyE4 - not located at the sensor.
We want to use the advantages of a current interface and transform it to voltage near the analogue input. Otherwise you'll get unstable measuring values.

Greetings Konni
« Letzte Änderung: November 11, 2022, 11:42:40 Vormittag von Konni66 »
Die Programmierbeispiele sind zu Schulungszwecken gedacht. Trotz sorgfältiger Erstellung und Funktionsprüfung können Fehler nicht ausgeschlossen werden. Daher erfolgt die Verwendung der Programmteile in eigener Verantwortung.

Offline Simon Tyrcha

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Antw:4-20mA Inputs to E4 UC 12RC1 operating on 24VAC
« Antwort #11 am: November 10, 2022, 18:43:17 Nachmittag »
Hello Simon,
your diagram looks good to me. That's the way I would try.

Greetings Konni


Vielen Danke, Konni!!! Ein schones wochenende!!!