Table of Contents
What is EC fan AHU?
EC plug fans provide a compact and high efficiency solution for air handling units. The high performance impeller, motor and electronics system are all optimally adjusted to one another, leading to an overall efficiency of well above 60%.
What is an EC fan motors?
An electronically commutated (EC) motor is designed to run on an alternating current (AC) power supply, but it in fact bears a closer resemblance to a direct current (DC) motor. It is essentially a permanent magnet, brushless DC motor that incorporates on-board electronics.
How is an EC fan controlled?
The speed control of an EC-motor is realized by its commutation control device by its own. In most cases this drive controller has a standard 230V mains connection, often as a wide range variation, i.e. 208V-277 at 50-60Hz. The user only needs to apply a suitable source for the speed-set-value.
Are EC fans Variable speed?
The electronically commutated fan’s DC motor has the advantage of a variable speed control built-in. An AC electrical supply powers the EC fan, but the on-board electronics convert the power to DC before reaching the motor.
Do ECM motors require VFDS?
Ease of Control: ECMs are DC motors that function using a built-in inverter and a magnet rotor (no external VFD). The motor’s operation is simply controlled by software allowing customers to optimize and integrate the motor, fan and controller with the application.
How are EC motors controlled?
EC motors are brushless dc motors controlled by external electronics—either an electronic circuit board or variable-frequency drive. The rotor contains permanent magnets and the stator has a set of fixed windings. The mechanical commutation is performed by the electronic circuitry.
Are all ECM motors 3 phase?
Most of the HVAC ECMs are three-phase permanent magnet motors. The significant difference here is that the ECM has the motor and speed control built into a single unit.
Is an ECM motor single-phase?
An electronically commutated motor is a three-phase, brushless DC motor. It comprises three major components: a circuit board, an electronic control module, and a three-phase motor with a permanent magnet rotor, as shown in Figure 1.
What’s the best way to diagnose an ECM motor?
Diagnosing ECM Motors
- Verify that the correct thermostat input voltage is present at the interface of the main control board on the furnace or air handler.
- When checking low-voltage connections, always use the C terminal on the board, never on the ground.