GSK72 (Customer) asked a question.
Wiring 3-Phase AC Current Transducer
Hi, I want to confirm something, I want to monitor the current of a 3-phase device, and I want to see if the current transducer 3ACT030-42-24-F can output to 4 channels of my BRX 16-input card BX-16AD-1). The phrase that they use in the documentation is confusing me. I attached a drawing of what I think the wiring should be. Could anyone confirm what I drew out is the correct application of the sensor. Thanks!
I haven't used one of these, but based on this answer in the Technical Questions, you don't add your loop power supply. You wire it like a 4-wire transmitter.
www.automationdirect.com/support/question-answer?techId=2166
From I understand, I can connect the negatives of the outputs to the com on the PLC, but as long as it is the same ground I should not have any issues. That is what it looks like from the click PLC documentation.
My only concern is with this note in the specs for the current transformer:
Note: Power Supply and output signal ARE NOT isolated. Do not connect the negative terminals to a common point.
BUT, the 1C terminals on your BX-16AD-1 are internally connected to the 0V terminal. Therefore, the negative terminals of the current transformer will be connected to 0V, which might share the same common point as the 24V connected to the 9 and 10 terminals.
Hopefully AD will chime in soon with a definitive answer.
-Eric
Yes you are correct, the common points of that module are internally connected to the 0v input terminal of the incoming power to the module. So I would definitely wait for someone from AD or Host to chime in here on how to connect that current transformer to the BRX module properly.
It almost seems like since the power in the current transformer is not isolated that the wiring may be more akin to the 3-wire transmitter in how it actually is all connected.
Each 3ACT030-42-24-F sensor outputs one analog signal, so you’ll need one sensor per phase. Connect each to a separate analog input on the BX-16AD-1. Your wiring looks correct for that setup.
Just a correction to the above, although they have single-phase current sensors, this sensor, 3ACT030-42-24-F, includes (4) outputs. Per the info provided with the sensor: "They provide an analog signal proportional to the current in each of the three phases, and another which will be proportional to the average of the three phase currents."
An update, so I decided to do a test to see if the negative of each of the outputs are connected together (pins 2, 4, 6 and 8) which it turned out that they are, but neither 9 nor 10 is connected to the pins mentioned earlier. From what I understand now is that as long as the source of power for the sensor and 24VDC power source for the analog card are two separate devices and are not connected to each other, then there won't be any issues with ground loops. I attached drawing of how I should be connecting it to the analog card.
i asked the same question about a month ago and Automation Direct replies in the thread. in my situation I only have one 24V power supply.
https://community.automationdirect.com/s/question/0D5RQ00000jdct80AA/3actr-to-p108adl1-wiring