STRA4 is a 5-step fan speed controller designed specifically for 3-phase 400 V motors equipped with thermal contacts. Its maximum combined motor current of 1,5 A.
Fan speed is adjusted using a rotary switch with an OFF position. The motor can be enabled or disabled remotely using digital inputs.
To ensure motor safety, STRA4 incorporates a TK monitoring function. In the event of overheating, the TK monitoring function automatically deactivates the motor, preventing damage.
In cases of power failure, the STRA4 has an automatic restart feature. After a power outage, the motor will restart automatically without any manual intervention.
STRA4 includes an alarm output and an unregulated output. The alarm output can be used to trigger external devices to generate alarms. The unregulated output can control external devices to confirm normal operation or activate additional equipment.
Fan speed is regulated by reducing the motor voltage using autotransformers. This technology ensures that the output voltage has a perfect sinusoidal shape, guaranteeing quiet operation of the motor and minimizing electrical noise.
The enclosure of the STRA4 is designed for surface mounting and offers IP54 protection. This protection ensures resistance against the ingress of dirt, dust, and moisture.