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.webp "3 ph speed regulator AC fan")
EU declaration conformity
400 V transformer fan speed controller | TK monitoring | 11 A
Product description
Transformer fan speed controller for 400 V motor with thermal connections. The combined maximum motor current is 11 A.
The fan speed may be adjusted using the built-in rotary switch on the front cover. When the TK monitoring mechanism detects overheating, it shuts the motor.
The fan speed is controlled in 5 stages by lowering the motor voltage. The output voltage's excellent sinusoidal form ensures silent motor running.
The enclosure is surface mountable and offers IP54 protection against dirt, dust, and moisture entry.
The supply voltage is 400 V.
Additional specifications and description
The STRS4110L40 is designed to control a 400 V, three-phase fan using autotransformer technology. The autotransformer has multiple taps or terminals along its primary winding, allowing for voltage adjustments and different fan speed settings. The available output voltages are 130, 180, 230, 300 and 400 V.
The controller features a built-in switch that enables the manual selection of five different fan speeds. The autotransformer technology employed in the controller ensures a dependable and durable operation. It produces a perfectly sinusoidal motor voltage, resulting in quiet motor operation and an extended motor lifespan. The autotransformers are coated with a special impregnation to reduce electrical noise.
When wiring a three-phase fan motor, it is important to follow specific rules for proper connections and safe operation. The motor leads are typically labelled U, V, and W for the three phases, with R, S, and T serving as power supply terminals for the controller. The motor voltage should match the power supply voltage, and the motor may need to be wired in a delta (Δ) or star (Y) configuration based on the motor voltage and available power supply. Grounding the motor is typically required for safety.
TK monitoring
The STRS4 series includes TK monitoring, which allows for the monitoring of thermocouple (TK) or thermal motor contacts. A thermocouple is a device that consists of two dissimilar metal wires joined at one end to form a junction. This junction is connected to the motor windings or thermal motor contacts. When the motor operates, it generates heat, and the temperature of the windings or contacts increases. The TK monitoring function measures the temperature at the motor windings or thermal motor contacts. This is typically done by monitoring the voltage generated by the thermocouple or thermal motor contacts, as the voltage is proportional to the temperature.
The TK contacts of the STRS4 series measure the temperature in the motor windings, and the TK monitoring function can shut off the motor in case of overheating to prevent motor damage. If the motor does not have TK contacts, the controller's two TK terminals need to be bridged to simulate normal motor temperature.
Extra 230 VAC, single-phase output
The STRS4 series also features an additional unregulated output (1x 230 VAC) that is activated when the motor is enabled. This output can be used to operate devices such as dampers or external run indicators. For example, the dampers can close when the fan is turned off and open when the fan is running.
Installation requirements
During installation, it is important to follow specific requirements for proper functionality and safety. The controller should be mounted on a stable and secure surface, preferably vertically, to allow for proper airflow and cooling of internal components. Sufficient ventilation around the controller is necessary to prevent overheating. The controller should be installed in an environment with a reasonable ambient temperature and away from heat sources or direct sunlight. Wiring should be securely fastened and shielded. Consideration should be given to environmental factors such as moisture, dust, or corrosive materials, and suitable enclosures or covers can be used for added protection.
The metal enclosure of the STRS4 has a paint coating to resist external mechanical impacts. The IP54 ingress protection rating ensures a high level of protection against dust and water ingress, making it suitable for moderately harsh environments.
The controller features a built-in switch that enables the manual selection of five different fan speeds. The autotransformer technology employed in the controller ensures a dependable and durable operation. It produces a perfectly sinusoidal motor voltage, resulting in quiet motor operation and an extended motor lifespan. The autotransformers are coated with a special impregnation to reduce electrical noise.
When wiring a three-phase fan motor, it is important to follow specific rules for proper connections and safe operation. The motor leads are typically labelled U, V, and W for the three phases, with R, S, and T serving as power supply terminals for the controller. The motor voltage should match the power supply voltage, and the motor may need to be wired in a delta (Δ) or star (Y) configuration based on the motor voltage and available power supply. Grounding the motor is typically required for safety.
TK monitoring
The STRS4 series includes TK monitoring, which allows for the monitoring of thermocouple (TK) or thermal motor contacts. A thermocouple is a device that consists of two dissimilar metal wires joined at one end to form a junction. This junction is connected to the motor windings or thermal motor contacts. When the motor operates, it generates heat, and the temperature of the windings or contacts increases. The TK monitoring function measures the temperature at the motor windings or thermal motor contacts. This is typically done by monitoring the voltage generated by the thermocouple or thermal motor contacts, as the voltage is proportional to the temperature.
The TK contacts of the STRS4 series measure the temperature in the motor windings, and the TK monitoring function can shut off the motor in case of overheating to prevent motor damage. If the motor does not have TK contacts, the controller's two TK terminals need to be bridged to simulate normal motor temperature.
Extra 230 VAC, single-phase output
The STRS4 series also features an additional unregulated output (1x 230 VAC) that is activated when the motor is enabled. This output can be used to operate devices such as dampers or external run indicators. For example, the dampers can close when the fan is turned off and open when the fan is running.
Installation requirements
During installation, it is important to follow specific requirements for proper functionality and safety. The controller should be mounted on a stable and secure surface, preferably vertically, to allow for proper airflow and cooling of internal components. Sufficient ventilation around the controller is necessary to prevent overheating. The controller should be installed in an environment with a reasonable ambient temperature and away from heat sources or direct sunlight. Wiring should be securely fastened and shielded. Consideration should be given to environmental factors such as moisture, dust, or corrosive materials, and suitable enclosures or covers can be used for added protection.
The metal enclosure of the STRS4 has a paint coating to resist external mechanical impacts. The IP54 ingress protection rating ensures a high level of protection against dust and water ingress, making it suitable for moderately harsh environments.
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