Unable to control opening and closing of valve of Belimo TFRB24 using NI DAQ 6212

[anis77]

I have connected two red and wire terminals from 24 VDC step down transformer to corresponding red and black wires from Belimo actuator. I have connected orange wire from the actuator to NI DAQ 6212 Analog Ouput A01 and AGND. My LabVIEW program is attached herewith. I am not able to open and close the control valve when temperature exceeds certain limit. I have used DAQ 9212 and K type thermocouple for temperature measurement. Please can anybody solve this problem. What is wrong with my wire connection? I think it is correct in LabVIEW.

Thank you.

[santo_13]

Are you sure you've TFRB24?, the datasheet shows only two wires and no control signal.

[anis77]

Hi. Thank you for the reply. It is TFRB24-SR.

[santo_13 · Accepted solution]

User manual - https://www.belimo.com/mam/general-documents/datasheets/en-us/belimo_TFRB24-SR_datasheet_en-us.pdf

Looks like you've connected the Orange wire to AO GND whereas it is your feedback signal from the motor and you missed to connect the GND together.

• Connect GND of 24V with AO GND and AI GND of 6212
• Connect White wire (Y Input) of the valve motor to any of the AO channels of 6212
• Connect Orange wire (U output) of the valve motor to any of the AI channels of 6212

[anis77]

Thank you for your reply. I tried to reconnect the wire as per your suggestions. Please see the attached pictures. But I am still facing the same issue of being unable to control the valve's opening and closing. I don't know what mistake I made with the connections. Could you please take a look and find my mistake? Thank you.

[santo_13]

It would be better if you had listed the connections you made instead of having me to search for pinout and look at images to figure out the connections.

For sure, you need to make your wiring better or pretty soon you will regret after blowing things up.

1. Have you tested that the TFRB24 motor works without the 6212 connection?
   1. Use a potentiometer to adjust the voltage set point for the `Control Signal` going to the motor instead of 6212
2. How are you actually controlling the 6212 to send the right signal?
   1. Use the DAQmx test panels to generate a constant voltage signal
3. What value do you read on the `Feedback Signal` of the motor?
   1. Use a digital multimeter to measure the voltage or use the DAQmx test panels to measure the voltage
4. Before all of the above ensure the power supply is turned ON and works

[anis77]

Thank you for the great help. It is working now.

[santo_13]

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@anis77 wrote:

Thank you for the great help. It is working now.

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It's good that it is working now, so what changed between your last comment and this one?

Please don't forget to mark the appropriate post as an answer if it helped answer your question.

[anis77]

The connection you had suggestion was correct. I had used voltage range 3-6 V, so even it was working, i could not see the opening and closing of the valve. I increased the range from 2-10 V, now , it seems, it has wider openings.