Din rail 3 phase AC Current transmitter wiring diagram?

Other Hardware Sensors
1

Hello,
I have bought current hall sensor for 3 phase. Obviously from Aliexpress :-(. And the wiring description on label and on website is confused as I'm not sure which one is currect.

If anyone already might using this sensor, I would appreciate if anyone can provide a real picture and experience which port are correct for power up device and which port for connecting on arduino.
Thanks in advance...

ac 3phase current sensor wiring diagram
ac 3phase current sensor wiring diagram900×468 87.1 KB

ac 3phase current sensor

2

Not got one my self but it looks straight forward.

P+ is the Arduino 5V supply
Com is the Arduino ground.
Out A+ to an analogue input pin
Out B+ to an analogue input pin
Out C+ to an analogue input pin

3

Thanks for you comments, but if you compare pictures the OutPin and power supply ports are opposite. Like Wiring Diagram is having on 7 = OutA+, and label on product have on 7 = 24V. This what concerns me, which one is correct?

4

I would rely on the label on the device. It requires 24vdc for power and outputs a 4-20 mADC signal proportional to 0-20 amps A/C on each phase. You will need to use a resistor in each current loop to convert the signals to a voltage that your Arduino can measure. The resistor value will depend on what reference voltage you use.

You will need to connect the Arduino ground to the common pin of the transmitter. Each resistor will also connect between its signal positive and common.

5

This is how I would look at it.
Using for example an Arduino Uno Rev 3 I would make sure my ADC reference was 5.0 volts. I would place a 250 ohm precision 1% resistor from each current out to ground so the 4 ~ 20 mA which is proportional to current becomes 1.0 to 5.0 volts.

I would use A0, A1 and A2 on your Arduino board and in your code map the analog values to get your current for each phase.

Keep in mind these inexpensive AC current transducers are likely Average Responding RMS Indicating sensors or simply put they only give accurate numbers when used with a pure sine wave. Keep in mind that a quality 3 phase current transducer like this one CR4480 Average RMS AC Current Transducer - Three Element - 4~20mADC Output has a price tag of $276 USD. You want true RMS? Then we get CR4180 True RMS AC Current Transducer - Three Element - with 4~20mADC Output having a price tag of $750 USD.

Calculate power in your code. The formula for power of a 3-phase circuit is Power = Voltage (V) x Current (I) x Power Factor (PF) x square root of three . If we assume the load on the circuit is resistive only, power factor is unity (or one) which reduces the formula to P = V x I x square root of three.

Ron