.webp "5 step controller AC fan")
.webp "5 step controller extraction fan")
.webp "5 step controller HVAC fan")
.webp "5 step controller exhaust fan")
.webp "5 step controller axial fan")
EU declaration conformity
Fan speed controller 400 V | TK monitoring | remote run-stop | 4 A
Product description
Motor Compatibility: Designed for three-phase 400 VAC motors with thermal contacts, handling a maximum current of 4A.
Speed Control: Features a 5-step rotary switch for manual speed adjustment and supports remote control via extra inputs.
Safety Features: Includes TK monitoring for automatic shutdown on overheating and an automatic restart function after power failures.
Outputs: Equipped with an alarm output for external alerts and an unregulated output for controlling other devices.
Technology: Uses autotransformer technology to ensure quiet, smooth motor operation with minimal electrical noise.
Housing: The IP54-rated enclosure is suitable for surface mounting and protects against dust and moisture.
Additional specifications and description
How does the controller adjust fan speed and ensure protection?
This fan speed controller features a rotary switch with five positions, each corresponding to a different fan speed. The technology employed in this controller utilizes autotransformers to reduce fan speed and motor voltage in five incremental steps. The available output voltages in the series are 130, 180, 230, 300, and 400 VAC. Additionally, it is equipped with TK contacts for thermal motor protection and run/stop contacts (NC – closed / NO open) for external or remote starting and stopping.
What are the benefits of using autotransformer technology?
The autotransformer technology employed in this controller is renowned for its reliability and robustness. It generates motor voltage with a perfect sinusoidal shape, ensuring exceptionally quiet motor operation and an extended service life. Any residual electrical noise generated by the autotransformers is effectively filtered by a special impregnation.
What are the proper wiring and motor compatibility requirements?
This fan speed controller is appropriate only for 3-phase, voltage-controllable motors. If you are uncertain whether your motor supports voltage control, it is advisable to contact the motor manufacturer.
When wiring a three-phase fan motor, specific guidelines must be followed to ensure correct connections and safe operation. The controller is typically supplied using the R, S, and T terminals, while the motor leads are labeled U, V, and W for the three phases. The motor voltage should match the available power supply voltage, and the motor may need to be wired in a delta (Δ) or star (Y) configuration, as indicated by the motor nameplate or manufacturer's documentation. Always comply with grounding guidelines specified by local electrical codes.
What additional control options are available through the extra inputs?
The STRA4 series introduces additional control options through extra inputs. These inputs allow remote enabling or disabling of the motor. For instance, you can connect a smoke alarm to the input. In the event of a smoke alarm, the motor is disabled, overriding the status of other inputs. This feature is especially useful in environments where the spread of toxic smoke gases through the ventilation system needs to be slowed down. Additionally, you can connect a door contact to control an air curtain. When the door opens, the contact triggers the air curtain via the STRA4 controller's input. The air curtain will run at a fixed speed.
How does the thermal motor protection (TK) function work?
This fan speed controller offers the same speed control as the standard STR-4 series but with more options. One of them is monitoring thermal motor contacts or TK contacts. These contacts monitor the temperature inside the motor windings. Thanks to TK contacts, the motor is disabled if it overheats, preventing motor damage and activating the alarm output. This alarm output can be used to connect an external alarm module, such as a buzzer or a light. If your motor lacks TK contacts, you must bridge the two TK terminals of the controller to simulate normal motor temperature.
How does the automatic reset feature handle power failures?
The STRA4 series includes an automatic reset feature in the event of a power failure. When the power is restored after an outage, the connected motor will restart automatically. This is a convenient and time-saving feature, especially in applications where continuous motor operation is essential without human intervention in the event of a power interruption. This feature is particularly valuable in ventilation systems, ensuring a constant fan speed for proper air circulation and control.
What is the purpose of the unregulated output?
The unregulated output provides a fixed output voltage of 230 VAC when the motor is enabled. This output is always either ON (230 Volt) or OFF (0 Volt) and cannot be adjusted or regulated. It has a maximum current rating of 2 A. This unregulated output allows for the simultaneous operation of other devices or equipment that need to work in coordination with the fan. For example, you can connect an indicator lamp to this output to provide a visual indication when the fan is running. If you have air ducts with closing valves that need to be opened or closed when the fan is running, you can use this output to control their actuation.
What are the key features and installation guidelines for the controller's enclosure?
The enclosure of this controller is constructed from high-quality steel, offering robustness and excellent protection against impacts. It is rated with an IP54 protection level, effectively guarding against dust and water ingress. This fan speed controller is designed for indoor installation on walls or panels. To ensure optimal cooling and performance:
• Select a cool installation location.
• Avoid direct sunlight and high-temperature areas.
• Use the controller exclusively for indoor applications.
This fan speed controller features a rotary switch with five positions, each corresponding to a different fan speed. The technology employed in this controller utilizes autotransformers to reduce fan speed and motor voltage in five incremental steps. The available output voltages in the series are 130, 180, 230, 300, and 400 VAC. Additionally, it is equipped with TK contacts for thermal motor protection and run/stop contacts (NC – closed / NO open) for external or remote starting and stopping.
What are the benefits of using autotransformer technology?
The autotransformer technology employed in this controller is renowned for its reliability and robustness. It generates motor voltage with a perfect sinusoidal shape, ensuring exceptionally quiet motor operation and an extended service life. Any residual electrical noise generated by the autotransformers is effectively filtered by a special impregnation.
What are the proper wiring and motor compatibility requirements?
This fan speed controller is appropriate only for 3-phase, voltage-controllable motors. If you are uncertain whether your motor supports voltage control, it is advisable to contact the motor manufacturer.
When wiring a three-phase fan motor, specific guidelines must be followed to ensure correct connections and safe operation. The controller is typically supplied using the R, S, and T terminals, while the motor leads are labeled U, V, and W for the three phases. The motor voltage should match the available power supply voltage, and the motor may need to be wired in a delta (Δ) or star (Y) configuration, as indicated by the motor nameplate or manufacturer's documentation. Always comply with grounding guidelines specified by local electrical codes.
What additional control options are available through the extra inputs?
The STRA4 series introduces additional control options through extra inputs. These inputs allow remote enabling or disabling of the motor. For instance, you can connect a smoke alarm to the input. In the event of a smoke alarm, the motor is disabled, overriding the status of other inputs. This feature is especially useful in environments where the spread of toxic smoke gases through the ventilation system needs to be slowed down. Additionally, you can connect a door contact to control an air curtain. When the door opens, the contact triggers the air curtain via the STRA4 controller's input. The air curtain will run at a fixed speed.
How does the thermal motor protection (TK) function work?
This fan speed controller offers the same speed control as the standard STR-4 series but with more options. One of them is monitoring thermal motor contacts or TK contacts. These contacts monitor the temperature inside the motor windings. Thanks to TK contacts, the motor is disabled if it overheats, preventing motor damage and activating the alarm output. This alarm output can be used to connect an external alarm module, such as a buzzer or a light. If your motor lacks TK contacts, you must bridge the two TK terminals of the controller to simulate normal motor temperature.
How does the automatic reset feature handle power failures?
The STRA4 series includes an automatic reset feature in the event of a power failure. When the power is restored after an outage, the connected motor will restart automatically. This is a convenient and time-saving feature, especially in applications where continuous motor operation is essential without human intervention in the event of a power interruption. This feature is particularly valuable in ventilation systems, ensuring a constant fan speed for proper air circulation and control.
What is the purpose of the unregulated output?
The unregulated output provides a fixed output voltage of 230 VAC when the motor is enabled. This output is always either ON (230 Volt) or OFF (0 Volt) and cannot be adjusted or regulated. It has a maximum current rating of 2 A. This unregulated output allows for the simultaneous operation of other devices or equipment that need to work in coordination with the fan. For example, you can connect an indicator lamp to this output to provide a visual indication when the fan is running. If you have air ducts with closing valves that need to be opened or closed when the fan is running, you can use this output to control their actuation.
What are the key features and installation guidelines for the controller's enclosure?
The enclosure of this controller is constructed from high-quality steel, offering robustness and excellent protection against impacts. It is rated with an IP54 protection level, effectively guarding against dust and water ingress. This fan speed controller is designed for indoor installation on walls or panels. To ensure optimal cooling and performance:
• Select a cool installation location.
• Avoid direct sunlight and high-temperature areas.
• Use the controller exclusively for indoor applications.
Remarks, reviews & ratings