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Transformer fan speed controllers

How to control AC fan speed? Here you can find 5-step fan speed controllers for single or three phase voltage controllable motors in HVAC applications. Fan speed controllers with autotransformers provide a simple, yet robust solution to control the speed of single or three phase voltage controllable motors by varying the motor voltage in steps. This technology generates a motor voltage with a perfect sinusoidal shape, guaranteeing a quiet motor operation. A special impregnated coating reduces the electrical noise from the autotransformers. These speed controllers allow you to control AC fan speed manually or demand based. In general, fan speed controllers offer you advantages in terms of comfort - optimisation of the supply of fresh air in your building, in terms of health - improvement of the indoor air quality as well as in environmental terms - thanks to the optimised airflow, your ventilation system will be more energy efficient.
Single phase motor controls, 230 VAC
Single phase motor controls, 230 VAC
Regulate the speed of single phase voltage controllable motors by varying the output voltage in steps. The controllers up to 7,5 A feature a plastic enclosure, the other models feature a metal enclosure.
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Three phase motor controls, 230 VAC
Three phase motor controls, 230 VAC
Regulate the speed of three phase 230 VAC voltage controllable motors by varying the output voltage in steps. All models feature a metal enclosure.
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Three phase motor controls, 400 VAC
Three phase motor controls, 400 VAC
Regulate the speed of three phase 400 VAC voltage controllable motors by varying the output voltage in steps. All three-phase transformer fan speed controllers feature a metal enclosure. This product group contains devices that can be controlled manually and devices with analogue input - the STVS4 series that require a 0-10 VDC control signal. Some product series feature thermal motor protection via TK monitoring for motors equipped with TK or Thermal Contact - in case the motor gets overheated, the fan speed controller will stop the motor and activate an alarm output if available. The advanced speed control versions feature a digital input, an alarm output and an unregulated output. The alarm output or the unregulated output can be used to connect a damper actuator, valve, run indicator lamp, etc. The digital input makes it possible to connect a switch or thermostat to generate a remote start/stop command. Another advantage of this digital input is the auto restart after power failure.
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