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Transformer fan speed controllers


5-step fan speed controllers control single-phase or three-phase voltage controllable motors. They regulate AC fan speed by varying the motor voltage in steps. The autotransformer technology generates a motor voltage with a perfect sinusoidal shape. This guarantees quiet motor operation. A special impregnated coating reduces the electrical noise from the autotransformers. Typically, they are used in HVAC applications.

Single-phase motor controls 115 - 230 VAC
Transformer fan speed controllers for single-phase voltage controllable motors. The supply voltage is in the range of 115 - 230 VAC. They control AC fan speed by varying the motor voltage in steps. The requested fan speed can be adjusted manually or automatically via Modbus RTU communication. In combination with a Sentera HVAC sensor, demand based ventilation control is possible.
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Single-phase motor controls - 230 VAC
Transformer fan speed controllers for single-phase 230 VAC voltage controllable motors. They control AC fan speed by varying the motor voltage in steps. The controllers up to 7,5 A have a plastic enclosure, the other models have a metal enclosure.
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Three-phase motor controls - 230 VAC
Transformer fan speed controllers for three-phase 230 VAC voltage controllable motors. They control AC fan speed by varying the motor voltage in steps. All models have a metal enclosure.
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Three-phase motor controls - 400 VAC
Transformer fan speed controllers for three-phase 400 VAC voltage controllable motors. They control AC fan speed by varying the motor voltage in steps. All models have a metal enclosure. Most of them are controlled manually. The advanced fan speed controllers have a digital input, alarm output and unregulated output. The STVS4 series are controlled via their analogue input.
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