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How to regulate fan speed with EC motors?

Motor and fan related questions
An EC motor or Electronically Commutated motor can be seen as an AC motor with integrated fan speed controller.

This means that an EC motor requires an indication of the desired fan speed or a fan speed setpoint. The most common ways to provide this information to the EC motor are:
- Potentiometer that sends a 0-10 VDC (analogue) signal to the EC motor (*)
- HVAC sensor that sends a 0-10 VDC (analogue) signal to the EC motor (*)
- HVAC sensor that sends the desired fan speed via Modbus RTU to the EC motor (**)
- HVAC controller that sends the desired fan speed via Modbus RTU to the EC motor (**)

(*) Some Sentera devices can also generate a 0-20 mA or PWM signal.
(**) In this case, an EC motor with Modbus RTU communication is required. The motor type should be compliant with Sentera PoM devices.
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