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EU declaration conformity
3-step control switch for EC fan | OFF-position
Product description
The SMT-D-4P-EM is a 3-step control switch designed to optimise 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 optimisation, 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 customised 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.
Additional specifications and description
Fans with EC motors
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).
Control an EC motor
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.
What is a 3-step control switch?
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.
Adjustable output levels
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 2 can be adjusted in the range of 5 - 9 VDC. Position 3 always equals the supplied voltage: 10 VDC.
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 2 can be adjusted in the range of 5 - 9 VDC. Position 3 always equals the supplied voltage: 10 VDC.
OFF-position
This control switch has an OFF-position. In position 0, the output voltage is 0 VDC, i.e. the fan is stopped.
Solid enclosure for flush and surface mounting
The SMT-1-30 enclosure is made of solid ASA plastic in a nice cream colour (RAL9010) that is UV-resistant and protects the electronics from dust, water, and impacts. The enclosure features both flush and wall mounting options, making it easy to install in any kind of wall, including drywalls, masonry walls or panels. You do not need to look for different product versions. If you choose the flush mounting option, it fits perfectly into the standard European box and blends in with the background. The protection class is IP44 for flush and IP54 for surface mounting. It looks nice and is a good match for any interior style. Cleaning it is very easy using only a damp cloth.
To guarantee the quality of our enclosures, we produce them ourselves. Our manual control switch is designed to be durable and reliable in diverse HVAC applications. It features a robust build that can withstand the demands of continuous operation, providing users with a dependable solution for their fan control needs.
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