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EU declaration conformity
Three phase fan speed controller | calendar function | 8 A
Product description
This fan speed controller is specifically designed for controlling three-phase 400 V motors. The maximum combined current of 8 A.
The calendar function allows setting 2 optimal motor speeds, and the timer with a day-week configuration 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
The ST2R4 is a sophisticated controller offers a range of features for controlling and protecting a motor-driven fan system, allowing for automation, remote control and monitoring of its operation while providing robust protection and durability with its solid enclosure.
Thanks to the built-in clock, these transformer controllers can work completely autonomously. When commissioning, two speeds (high and low) can be selected out of 0-130-170-210-250-290-330-400 V. High and low speed operation time ranges can be set in the clock together with a range of motor stop (day/week program). Thus, the ideal control over a prolonged period is achieved eliminating the need for frequent settings.
Wiring
When wiring a three-phase fan motor, you need to follow specific guidelines to ensure correct connections and safe operation.
The first step is to identify the motor leads. Typically, three-phase motors have six leads, labeled U, V and W for the three phases. These are the outputs to the motor, while the controller itself is supplied using the R, S and T terminals. ,
Check the motor nameplate or specifications to determine the voltage rating of the motor. It is essential to match the motor voltage with the available power supply voltage.
Depending on the motor voltage and the available power supply, you may need to wire the motor in either a delta (Δ) or a wye (Y) configuration. The motor nameplate or manufacturer's documentation should indicate the suitable wiring configuration for the specific motor model.
Follow the grounding guidelines specified by local electrical codes. Typically, three-phase motors require grounding for safety purposes.
Day-week timer
The controller has a built-in day-week timer 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 have to bridge the TK terminals to simulate normal motor temperature.
Unregulated output
The controller provides an unregulated output of 230 VAC that is active when the motor is enabled. This output can be used to control external devices like run 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 used to trigger alerts, such as controlling a warning lamp to indicate issues with the motor or the system.
Metal enclosure
The controller is housed in a high-quality sheet steel enclosure that offers an IP54 protection rating. This protection ensures that the controller is resistant to dirt, dust, and moisture, making it suitable for various environmental conditions.
Thanks to the built-in clock, these transformer controllers can work completely autonomously. When commissioning, two speeds (high and low) can be selected out of 0-130-170-210-250-290-330-400 V. High and low speed operation time ranges can be set in the clock together with a range of motor stop (day/week program). Thus, the ideal control over a prolonged period is achieved eliminating the need for frequent settings.
Wiring
When wiring a three-phase fan motor, you need to follow specific guidelines to ensure correct connections and safe operation.
The first step is to identify the motor leads. Typically, three-phase motors have six leads, labeled U, V and W for the three phases. These are the outputs to the motor, while the controller itself is supplied using the R, S and T terminals. ,
Check the motor nameplate or specifications to determine the voltage rating of the motor. It is essential to match the motor voltage with the available power supply voltage.
Depending on the motor voltage and the available power supply, you may need to wire the motor in either a delta (Δ) or a wye (Y) configuration. The motor nameplate or manufacturer's documentation should indicate the suitable wiring configuration for the specific motor model.
Follow the grounding guidelines specified by local electrical codes. Typically, three-phase motors require grounding for safety purposes.
Day-week timerThe controller has a built-in day-week timer 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 have to bridge the TK terminals to simulate normal motor temperature.
Unregulated output
The controller provides an unregulated output of 230 VAC that is active when the motor is enabled. This output can be used to control external devices like run 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 used to trigger alerts, such as controlling a warning lamp to indicate issues with the motor or the system.
Metal enclosure
The controller is housed in a high-quality sheet steel enclosure that offers an IP54 protection rating. This protection ensures that the controller is resistant to dirt, dust, and moisture, making it suitable for various environmental conditions.
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