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EU declaration conformity
Three phase fan speed controller | calendar function | 6 A
Product description
This fan speed controller is specifically designed for controlling three-phase 400 V motors. The controller can handle a maximum combined current of 6 A.
The calendar function allows you to set two optimal motor speeds, and the timer with a day-week program enables automatic switching between these speeds based on predefined schedules.
To ensure motor safety, the controller includes a TK monitoring function that monitors motor temperature. If overheating is detected, the controller will deactivate the motor to prevent damage.
In the event of a power failure, the controller is equipped with an automatic restart feature., i.e. once the power is restored, the motor will automatically restart without the need for manual intervention.
The enclosure of the controller is suitable for surface mounting indoors and has an IP54 rating, providing protection against dust and offering resistance to water splashes.
The AC fan speed control is achieved by reducing the motor voltage using autotransformer technology. This technology generates a motor voltage with a perfect sinusoidal waveform, ensuring smooth and quiet motor operation.
The supply voltage for the controller is 400 VAC.
Additional specifications and description
This three-phase, 400 VAC transformer-based fan speed controller is a comprehensive and versatile solution for managing and protecting motor-driven fan systems. With its advanced features, including the calendar function, remote start-stop, thermal motor protection, unregulated output, automatic reset after power failure, alarm output, and a durable solid enclosure, it offers a complete package for controlling fan speed and motor operation while prioritizing safety and reliability. Whether in industrial or commercial settings, this controller can be a valuable addition to your infrastructure, enhancing efficiency and ensuring the smooth operation of your fan system.
Day-week timer
The controller has a built-in day-week timer (calendar functionality) that allows you to set different fan speeds for different times of the day or week. It provides the flexibility to select two optimal speeds.
Remote start-stop
You can remotely enable or disable the motor connected to the controller using two input options - one that is normally open and another that is normally closed.
Thermal motor protection
The controller can monitor thermal motor contacts (TK or thermal contacts) to measure the temperature in the motor windings. In case the motor overheats, the TK monitoring function will disable the motor to prevent damage. If the motor does not have TK contacts, you must bridge the TK terminals to simulate normal motor temperature.
Unregulated output
The controller provides an unregulated output - 230 VAC - that is active when the motor is enabled. This output can be used to control external devices like light indicators or dampers. For example, it can be used to open dampers when the fan is active and close them when the fan is deactivated.
Auto reset after power failure
In the event of a power failure, the controller will automatically reset itself. When the power is restored, the motor will restart automatically, ensuring a seamless operation after power interruptions.
Alarm output
The controller has an alarm output that is activated when motor problems occur. This can be be used to trigger alerts or alarms, such as controlling a warning light to indicate issues with the motor or the system.
Surface mounted enclosure
The primary function of the housing is to shield the internal components of the controller from external contaminants, moisture, and adverse environmental conditions. Sentera maintains a rigorous quality control process for its products, encompassing both electrical and non-electrical elements. The enclosure of the ST2R4 series is made of sheet steel with a protective paint coating, providing dependable protection against mechanical and environmental influences. It is certified in compliance with the European standard EN 62208 and has an IP54 rating against dust and moisture.
To ensure optimal reliability and safety while eliminating the risk of overheating, the regulator should be installed in a cool location away from direct sunlight. The permissible operating ambient temperature range for the transformer speed controller is from -20 to +35 °C, with relative humidity ranging from 5% to 95%. Moisture condensation within the working area must be avoided.
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