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EU declaration conformity
Three phase fan speed controller | calendar function | 8 A
Product description
Motor Compatibility: Designed for three-phase 400V motors with a maximum combined current of 8A.
Speed Control: Uses autotransformer technology to provide smooth and quiet operation by generating a perfect sinusoidal voltage waveform.
Automation: A calendar and timer allow for automatic switching between two pre-set speeds based on a weekly schedule.
Safety: Features a TK monitoring function to protect the motor from overheating and an automatic restart capability after a power outage.
Housing: The IP54-rated enclosure is suitable for indoor, surface-mounted installation, protecting against dust and water splashes.
Additional specifications and description
What are the core features of the ST2R4 controller?
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.
How do you properly wire a three-phase fan motor?
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.
How does the day/week timer function work?
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.
How can the motor be remotely controlled?
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.
How does the thermal motor protection (TK) function work?
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.
What is the purpose of the 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.
What happens after a 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.
What activates the 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.
What are the key features of the controller's housing?
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.
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.
How do you properly wire a three-phase fan motor?
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.
How does the day/week timer function work?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.
How can the motor be remotely controlled?
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.
How does the thermal motor protection (TK) function work?
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.
What is the purpose of the 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.
What happens after a 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.
What activates the 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.
What are the key features of the controller's housing?
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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