EU declaration conformity
3-step control switch for EC fan | OFF-position
Elevate your ventilation control with the SMT-D-4P-EM, a 3-step control switch designed to optimize control of EC fan speed, damper actuators, AC fan speed controllers or frequency inverters. The SMT-D-4P-EM offers versatile control, providing three fixed positions that simplify the process of adjusting fan speed. These fixed positions ensure effortless optimization, allowing you to easily find the ideal speed for your specific ventilation requirements.
One of the standout features of this control switch is its adjustable output signals. The output signal on position 1 can be customized within the 3 – 7 VDC range, position 2 within the 5 - 9 VDC range and position 3 consistently delivers the full input voltage, commonly 10 VDC.
The SMT-D-4P-EM comes with OFF-position. This offers the convenience of shutting down your system when needed, providing complete control over your ventilation environment..
Designed with durability in mind, the splash-proof enclosure of the SMT-D-4P-EM allows for either inset mounting (IP44) or surface mounting (IP54). This ensures that, regardless of your preferred installation method, the device remains robust enough to withstand various environmental factors. Trust in the SMT-D-4P-EM's construction to deliver optimal performance in any setting.
Additional specifications and description
An Electronically Commutated (EC) motor generally features a rotor composed of permanent magnets that rotates within or around the stator. The integrated fan speed controller produces an electrical current within the stator windings, its strength varying based on the 0-10 V control signal. This electrical current generates a rotating magnetic field, to which the permanent magnets align, thereby propelling the operation of the EC motor.
The main advantages of EC motors over AC motors are higher energy efficiency, long service life, lower noise levels, lower electromagnetic interference (EMI).
For optimal functionality, an EC motor relies on a control signal that specifies the desired fan speed. This control signal can be digital, employing Modbus RTU communication, or analogue, typically ranging from 0 to 10 Volts. The SMT-D-4P-EM manually produces such a signal manually in stepped increments.
The output voltage of this control switch varies according to the position of the rotary knob. The output voltage is divided in three steps. This control switch controls EC fans or damper actuators in three steps. It can also remotely control AC fan speed controllers (for instance Sentera’s EVS or MVS series) or frequency inverters (FI-E series) in three steps. This control switch can be installed in the living room while the fan speed controller is located in a technical room or an electrical cabinet.
For some applications, it is desirable to adjust the control signal in order to obtain the optimal fan speed. Position 0 is fixed to 0 VDC. The control signal of position 1 and position 2 can be adjusted via internal trimmers. The output voltage of position 1 can be adjusted in the range of 3 - 7 VDC. The output voltage of position 1 can be adjusted in the range of 5 - 9 VDC. Position 3 always equals the supplied voltage: 10 VDC.