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EU declaration conformity
400 V transformer fan speed controller | TK monitoring | 1,5 A
Product description
This device is a 5-step transformer fan speed controller designed for 400 V motors with a combined maximum current of 1.5 A. Its primary function is to adjust fan speed by lowering the motor voltage in five distinct stages.
A built-in rotary switch on the front cover allows for manual speed selection. A key safety feature is the TK monitoring function, which automatically shuts off the motor in case of overheating. The controller produces a fully sinusoidal output voltage, ensuring quiet and smooth motor operation. The 400 V supply voltage is a standard requirement for this unit.
The controller is housed in a robust, surface-mountable enclosure. It holds an IP54 rating, providing protection against limited ingress of dust and water spray from any direction.
Additional specifications and description
What are the Benefits of Autotransformer Technology in Fan Motor Applications?
- Voltage reduction: Autotransformers are commonly used to reduce the voltage supplied to motors. By tapping into different points along the winding, the autotransformer can provide multiple voltage levels, allowing for speed control of the motor. This voltage reduction technique is more energy-efficient compared to other methods, as it avoids the need for dissipating excess energy as heat.
- Energy efficiency: Autotransformers offer high energy efficiency due to their inherent design. Since they operate on the principle of magnetic coupling between windings, there are fewer losses associated with electrical resistance. As a result, autotransformers can provide better power transfer efficiency compared to other voltage control methods.
- Smooth operation: The autotransformer technology used in your controller generates a motor voltage with a perfect sinusoidal shape. This smooth voltage waveform contributes to smooth motor operation, reducing vibrations and noise. It also helps minimize stress on the motor windings and other components, thereby extending the service life of the motor.
- Quiet operation: By producing a perfect sinusoidal voltage waveform, autotransformers contribute to exceptionally quiet motor operation. The absence of voltage harmonics and distortions reduces electrical noise, leading to a quieter environment in applications where noise reduction is essential, such as HVAC systems, fans, and other equipment that require low noise levels.
- Robustness and reliability: Autotransformers are known for their robustness and reliability in various power distribution and control applications. Their simple construction and fewer components make them less prone to failure compared to more complex voltage control methods. This reliability translates into reduced downtime and maintenance costs for the motor control system.
- Impregnated coating: The autotransformers in the controller are coated with a special material. This coating serves multiple purposes, including reducing electrical noise from the autotransformers and providing additional insulation and protection against environmental factors such as moisture and dust. The impregnated coating enhances the overall performance and longevity of the autotransformers in the controller.
How Does the STRS4 Series Enhance Motor Safety with Thermal Contact Monitoring?
Although the functionality of the STRS4 series is the same as that of the standard STR-4 series, the former is more sophisticated thanks to featuring thermal motor contacts monitoring (TK or thermal contacts measure temperature in the motor windings). In case of motor overheating, the TK monitoring function will disable the motor to prevent motor damage. If the motor is not equipped with TK contacts, the TK terminals of the controller must be bridged to simulate normal motor temperature. By incorporating the TK monitoring function and providing the option to bridge the TK terminals, the fan speed controller ensures motor safety by preventing overheating and potential damage, regardless of the motor's specific configuration.
What is the Purpose and Use of the STRS4-15L40's Unregulated Output?
The extra, unregulated output (1x 230 VAC) is active when the motor is enabled. It can be used to control an external operation indicator, a damper actuator, etc. When the fan is deactivated, the dampers is closed. When the fan is active, the damper is open.
What are the Material, Protection, and Durability Features of the STRS4-15L40 Enclosure?
The STRS4-15L40 features a sheet steel enclosure resistant to external mechanical impacts. They can withstand accidental hits or other physical forces without compromising its structure or the items inside. This is particularly important in environments where there is a higher risk of such impacts, ensuring the protection of the enclosed components. The enclosure has a paint finish, which serves as an extra layer of protection against corrosion and other environmental factors. The ingress protection rating of IP54 guarantees that the enclosures are designed to provide a high level of protection against dust and water ingress, they are effectively sealed against dust particles and can withstand water splashes from any direction, making them suitable for moderately harsh environments.
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