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How to send the desired fan speed to my EC motor or my AC fan speed controller?

Motor and fan related questions
The best way to do this is via Modbus RTU. The advantages of this recent, digital technology is the immunity for interferences. Thanks to this technology, you will be able to use longer cables – up to 1.000 m - without the risk of losing information. Devices that are connected via Modbus RTU can exchange a lot of information – not only the desired fan speed – and it is also possible to monitor and control them via internet.

The older - analogue - technology is still present in many installations. In these installations, the desired fan speed is usually transmitted via 0-10 VDC / 0-20 mA or PWM. The disadvantage of this technology is the sensitivity for interferences. If cable lengths are > 10 m, the maximum value received at the other side of the cable will not be 10 VDC anymore due to cable resistance. Also power cables nearby the signal cable, EMC pollution or magnetic fields can disturb the analogue signal. And since only the desired fan speed is transmitted, there is no possibility to monitor the status of the connected device or other parameters via internet.

More information can be found on the Sentera solutions page.
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