Both electronic fan speed controllers and transformer fan speed controllers
offer reliable speed regulation for AC voltage controllable motors. Electronic
fan speed controllers allow you to regulate the rotational speed of AC fans
manually or demand based. Phase angle control, achieved with triac technology,
is used to adjust the motor voltage and to control the fan speed. On the other
hand, fan speed controllers with autotransformers provide a simple, yet robust
solution to control the speed of AC voltage controllable motors in steps. The AC
motor can be controlled in 5 steps, manually or demand based. There are
solutions available for single phase 230 VAC or three phase 400 VAC voltage
controllable motors.
SD variable fan speed controllers regulate the speed of single-phase voltage controllable motors with a maximum current of 1,5 A. The output voltage towards the motor can be manually regulated via the central knob from maximum to minimum. The minimum speed can be adjusted via an internal trimmer. The enclosure allows inset mounting (IP44) or surface mounting (IP54). Their contemporary design is not the only difference with the good old MTX series. The new SD series are microprocessor controlled to guarantee accurate motor control and to minimise motor noise. Phase angle control (Triac technology) is used to vary the motor voltage and to regulate the motor speed.