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EU declaration conformity
400 V transformer fan speed controller | TK monitoring | 14 A
Product description
Transformer fan speed controller for 400 V motors with thermal contacts. The (combined) maximum motor current is 14 A.
The fan speed can be adjusted via an integrated rotary switch on the front cover. The TK monitoring function stops the motor in case of overheating.
The fan speed can be adjusted in five steps by reducing the motor voltage. The output voltage is fully sinusoidal and guarantees quiet operation of the motor.
The housing can be surface mounted and has an IP54 degree of protection against ingress of dirt, dust and moisture.
The supply voltage is 400 V.
Additional specifications and description
The STRS4140L50 is specifically designed to control three-phase fans operating at 400 V using autotransformer technology. The autotransformer has multiple taps along its primary winding, allowing for voltage adjustments and different fan speed settings. The available output voltages for the controller are 170, 220, 260, 300 and 400 VAC, however, this product features an additional 130 V output which can be connected by disconnecting any of the other five factory connected ones.
This controller features a built-in switch that enables the selection of five different fan speeds. The used autotransformer technology ensures reliable and durable operation by generating a perfectly sinusoidal motor voltage, resulting in quiet operation and an extended motor lifespan. The autotransformers are coated with a special impregnation to minimize electrical noise.
Connections
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 labeled U, V, and W for the three phases, while R, S, and T serve as power supply terminals for the controller. It is important for the motor voltage to match the power supply voltage, and the motor may need to be wired in a delta (Δ) or wye (Y) configuration based on the motor voltage and the available power supply. Grounding the motor is usually necessary for safety.
Extra features
The STRS4 series includes TK monitoring, which allows for the monitoring of thermocouple (TK) or thermal motor contacts. Thermocouples consist of two dissimilar metal wires joined at one end to form a junction, which is connected to the motor windings or thermal motor contacts. As the motor operates, it generates heat, causing the temperature of the windings or contacts to rise. The TK monitoring function measures the temperature at the motor windings or thermal motor contacts by monitoring the voltage generated by the thermocouple or thermal motor contacts, as it is proportional to the temperature.
The TK contacts in the STRS4 series measure the temperature in the motor windings, and the TK monitoring function can shut off the motor if it detects overheating, thus preventing 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.
Additionally, the STRS4 series provides an extra unregulated output (1x 230 VAC) that becomes active when the motor is enabled. This output can be utilized to operate devices such as dampers or external run-indicators. For instance, the dampers can close when the fan is turned off and open when the fan is running.
Mounting
During installation, it is important to adhere to specific requirements to ensure proper functionality and safety. Mount the controller on a stable and secure surface, preferably in a vertical position to enable adequate airflow and cooling of internal components. Sufficient ventilation around the controller is necessary to prevent overheating. Install the controller in an environment with a reasonable ambient temperature, away from heat sources and direct sunlight. Securely fasten and shield the wiring. Consider environmental factors like moisture, dust, or corrosive materials, and use suitable enclosures or covers for added protection.
The metal enclosure of the STRS4140L50 is coated with paint to withstand external mechanical impacts. With an IP54 ingress protection rating, it offers a high level of protection against dust and water ingress, making it suitable for moderately harsh environments.
This controller features a built-in switch that enables the selection of five different fan speeds. The used autotransformer technology ensures reliable and durable operation by generating a perfectly sinusoidal motor voltage, resulting in quiet operation and an extended motor lifespan. The autotransformers are coated with a special impregnation to minimize electrical noise.
Connections
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 labeled U, V, and W for the three phases, while R, S, and T serve as power supply terminals for the controller. It is important for the motor voltage to match the power supply voltage, and the motor may need to be wired in a delta (Δ) or wye (Y) configuration based on the motor voltage and the available power supply. Grounding the motor is usually necessary for safety.
Extra features
The STRS4 series includes TK monitoring, which allows for the monitoring of thermocouple (TK) or thermal motor contacts. Thermocouples consist of two dissimilar metal wires joined at one end to form a junction, which is connected to the motor windings or thermal motor contacts. As the motor operates, it generates heat, causing the temperature of the windings or contacts to rise. The TK monitoring function measures the temperature at the motor windings or thermal motor contacts by monitoring the voltage generated by the thermocouple or thermal motor contacts, as it is proportional to the temperature.
The TK contacts in the STRS4 series measure the temperature in the motor windings, and the TK monitoring function can shut off the motor if it detects overheating, thus preventing 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.
Additionally, the STRS4 series provides an extra unregulated output (1x 230 VAC) that becomes active when the motor is enabled. This output can be utilized to operate devices such as dampers or external run-indicators. For instance, the dampers can close when the fan is turned off and open when the fan is running.
Mounting
During installation, it is important to adhere to specific requirements to ensure proper functionality and safety. Mount the controller on a stable and secure surface, preferably in a vertical position to enable adequate airflow and cooling of internal components. Sufficient ventilation around the controller is necessary to prevent overheating. Install the controller in an environment with a reasonable ambient temperature, away from heat sources and direct sunlight. Securely fasten and shield the wiring. Consider environmental factors like moisture, dust, or corrosive materials, and use suitable enclosures or covers for added protection.
The metal enclosure of the STRS4140L50 is coated with paint to withstand external mechanical impacts. With an IP54 ingress protection rating, it offers a high level of protection against dust and water ingress, making it suitable for moderately harsh environments.
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