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EU declaration conformity
Fan speed controller 400 V | TK monitoring | remote run-stop | 1,5 A
Product description
Motor Compatibility: Designed for 3-phase 400V motors with thermal contacts, handling a maximum combined current of 1.5 A.
Speed Control: A 5-step rotary switch is used for manual speed adjustment, with an OFF position. The device also supports remote motor control via digital inputs.
Safety: A TK monitoring function automatically deactivates the motor upon detecting overheating. The controller also has an automatic restart feature after a power failure.
Outputs: Includes an alarm output to trigger external alerts and an unregulated output for controlling additional equipment.
Technology: Employs autotransformer technology to reduce motor voltage, ensuring a quiet operation with a perfect sinusoidal waveform and low electrical noise.
Housing: The enclosure is rated IP54 for protection against dust and moisture, and is designed for surface mounting.
Additional specifications and description
What are the main features of the STRA4 transformer controller?
The STRA4 transformer controller is designed to work with three-phase electric motors with a supply voltage of 400 V, whose maximum current does not exceed 1,5 A. The fan speed is adjusted using a switch located on the housing. The switch has five steps to control the voltage, as well as an OFF position. Using digital inputs to connect a switch or relay, it is possible to remotely start and stop the motor. Additional features of the controller include the presence of terminals for connecting thermal contacts and the ability to automatically restart in the event of a power failure. The speed controller housing provides IP54 protection.
Why is autotransformer technology a good choice for speed control?
Most electric motors are controlled by regulating the voltage supplied to them. Transformer controllers are a simple, convenient and cost-effective solution for speed control. An important advantage of using these devices is that they do not create electromagnetic disturbances that can negatively affect the operation of the electric motor and other nearby electrical equipment. Transformer speed controllers are the best option for use in rooms and areas with increased requirements for noise levels. Thus, the transformer speed controller is a solution that will ensure reliable and quiet operation of the electric motor at an affordable price.
How are the STRA4's remote control contacts used?
The STRA4 transformer speed controller has one normally open and one normally closed contact. They can be used to remotely turn the controller on and off, as well as to monitor its operation. Indication and warning devices, thermostats, temperature relays, etc. are used as connected equipment.
What is the purpose of the unregulated output?
The STRA4 speed controller is equipped with an additional unregulated output (230 V), which is closed when the electric motor is running. It is called unregulated because it has only two positions - closed (230 V) and open (0 V). The current for this output should not exceed 2 A. One example of the use of this output is to control the electric drive of an air or water valve. When the fan is turned on, the valve opens, and when it is turned off, it closes. If you need to remotely monitor the operation of the transformer controller, you can connect a lamp to the unregulated output.
How does the thermal protection (TK) function work?
The STRA4 fan speed controller is equipped with terminals for connecting the thermal contacts of the electric motor (TK). Thermal contacts are used to measure the temperature on the motor windings. In case of overheating, the electric motor will be stopped to eliminate the risk of its failure. If the motor is not equipped with thermal contacts, the TK terminals must be connected via bridge to simulate normal operation.
When is the alarm output triggered and what is its purpose?
The STRA4 speed controller is equipped with an unregulated output (230 V), which notifies of an accident. It is triggered when the thermal contacts that protect the electric motor from overheating open. This output can be used to connect a lamp or a buzzer. The maximum current of the connected equipment should not exceed 1 A.
What happens after a power failure?
When working with electrical equipment, you should always be aware of possible power failures. In the event of such a failure, once power is restored, the speed controller and motor will restart automatically.
What do the LED indicators on the controller mean?
The STRA4 fan speed controller is equipped with LED indicators located on the front of the controller. When connecting power to the transformer controller, the indicator will light green. When the motor overheat protection is triggered, the red indicator will light up.
What are the key features and installation requirements of the STRA4's housing?
The main purpose of the housing is to protect the inside of the controller from external contaminants and moisture, as well as from adverse environmental factors. Sentera closely monitors the quality of its manufactured and supplied products. The housing of STRA4 is made of sheet steel with a protective paint coating and provides reliable protection against mechanical and other influences. It is certified according to the European standard EN 62208 and has a dust and moisture protection rating of IP54. To ensure maximum reliable and safe operation, as well as to eliminate the possibility of overheating, the controller must be installed in a cool place without direct sunlight. The ambient temperature for operating the transformer speed controller must be in the range from -20 to +35 °C, and the relative humidity - from 5 to 95%. Moisture condensation in the work area is not allowed.
The STRA4 transformer controller is designed to work with three-phase electric motors with a supply voltage of 400 V, whose maximum current does not exceed 1,5 A. The fan speed is adjusted using a switch located on the housing. The switch has five steps to control the voltage, as well as an OFF position. Using digital inputs to connect a switch or relay, it is possible to remotely start and stop the motor. Additional features of the controller include the presence of terminals for connecting thermal contacts and the ability to automatically restart in the event of a power failure. The speed controller housing provides IP54 protection.
Why is autotransformer technology a good choice for speed control?
Most electric motors are controlled by regulating the voltage supplied to them. Transformer controllers are a simple, convenient and cost-effective solution for speed control. An important advantage of using these devices is that they do not create electromagnetic disturbances that can negatively affect the operation of the electric motor and other nearby electrical equipment. Transformer speed controllers are the best option for use in rooms and areas with increased requirements for noise levels. Thus, the transformer speed controller is a solution that will ensure reliable and quiet operation of the electric motor at an affordable price.
How are the STRA4's remote control contacts used?
The STRA4 transformer speed controller has one normally open and one normally closed contact. They can be used to remotely turn the controller on and off, as well as to monitor its operation. Indication and warning devices, thermostats, temperature relays, etc. are used as connected equipment.
What is the purpose of the unregulated output?
The STRA4 speed controller is equipped with an additional unregulated output (230 V), which is closed when the electric motor is running. It is called unregulated because it has only two positions - closed (230 V) and open (0 V). The current for this output should not exceed 2 A. One example of the use of this output is to control the electric drive of an air or water valve. When the fan is turned on, the valve opens, and when it is turned off, it closes. If you need to remotely monitor the operation of the transformer controller, you can connect a lamp to the unregulated output.
How does the thermal protection (TK) function work?
The STRA4 fan speed controller is equipped with terminals for connecting the thermal contacts of the electric motor (TK). Thermal contacts are used to measure the temperature on the motor windings. In case of overheating, the electric motor will be stopped to eliminate the risk of its failure. If the motor is not equipped with thermal contacts, the TK terminals must be connected via bridge to simulate normal operation.
When is the alarm output triggered and what is its purpose?
The STRA4 speed controller is equipped with an unregulated output (230 V), which notifies of an accident. It is triggered when the thermal contacts that protect the electric motor from overheating open. This output can be used to connect a lamp or a buzzer. The maximum current of the connected equipment should not exceed 1 A.
What happens after a power failure?
When working with electrical equipment, you should always be aware of possible power failures. In the event of such a failure, once power is restored, the speed controller and motor will restart automatically.
What do the LED indicators on the controller mean?
The STRA4 fan speed controller is equipped with LED indicators located on the front of the controller. When connecting power to the transformer controller, the indicator will light green. When the motor overheat protection is triggered, the red indicator will light up.
What are the key features and installation requirements of the STRA4's housing?
The main purpose of the housing is to protect the inside of the controller from external contaminants and moisture, as well as from adverse environmental factors. Sentera closely monitors the quality of its manufactured and supplied products. The housing of STRA4 is made of sheet steel with a protective paint coating and provides reliable protection against mechanical and other influences. It is certified according to the European standard EN 62208 and has a dust and moisture protection rating of IP54. To ensure maximum reliable and safe operation, as well as to eliminate the possibility of overheating, the controller must be installed in a cool place without direct sunlight. The ambient temperature for operating the transformer speed controller must be in the range from -20 to +35 °C, and the relative humidity - from 5 to 95%. Moisture condensation in the work area is not allowed.
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