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EU declaration conformity
Kitchen hood exhaust fan speed controller | 3,5 A
Product description
A 5-step fan speed controller with an integrated relay for controlling an external gas valve. The best kitchen hood exhaust fan controller for single-phase AC fans. The motor's maximum current is 3,5 A.
The fan speed may be adjusted using the built-in rotary switch. To monitor air flow, an optional pressure relay is required. If no air flow is detected within 60 seconds of starting the motor, the relay output is shut to cease the gas flow. Local safety rules sometimes require that gas be delivered only after the kitchen hood exhaust fan above the stove has been turned on. n the event of a malfunction, the TK monitoring feature deactivates the motor.
As a result, the SFPR1 series is an excellent fan speed controller for industrial kitchen hoods!
The enclosure can be surface mounted and offers an IP54 protection against ingress of dirt, dust and moisture.
Additional specifications and description
Principle of operation
The operation of the SFPR1 is based on the use of a built-in autotransformer. It is used to control the voltage applied to the electric motor in five steps, which allows the fan speed to be varied. This technology is very reliable and durable. Sentera’s autotransformers also have a special impregnation to reduce the amount of electrical noise generated. The output voltage generated by the regulator is with a pure sine wave, which ensures quiet operation of the electric motor and increases its service life.
Gas valve control
The SFPR1 series of controllers feature a gas valve output, which opens only when the fan is working properly. When the controller is switched on, the gas valve actuator remains de-energized for one minute. If there is no air flow or pressure difference due to the operation of the fan during this period, the gas supply does not start. This operating logic makes the SFPR1 ideal for industrial kitchens.
Remote control for start and stop
The SFPR1 transformer fan speed controller additionally has a normally closed contact. It can be used to remotely turn the controller on and off, as well as to monitor its operation. Thermostats, temperature relays, etc. are used.
Auto power on after power failure
When working with electrical equipment, you should always be aware of possible power failures. In the event of such a failure, after the power is restored, the speed controller and motor will restart automatically.
Motor protection against overheating
The SFPR1 fan speed controller is equipped with terminals for connecting the thermal motor protection contacts (TK). Thermal contacts are used to measure the temperature on the motor windings. In the event of overheating, the motor will be stopped to eliminate the risk of damage or failure. After the overheating protection trips, the speed controller is restarted manually. If the motor is not equipped with thermal contacts, the TK terminals must be connected together (via a bridge) to simulate its normal operation.
Unregulated output
The SFPR1 speed controller has an additional unregulated output (230 V) that is active when the motor is running. It is called unregulated because it has only two positions - on (230 V) and off (0 V). The maximum current for this output must not exceed 2 A. One example of the use of this output is to control a gas valve motor. In the absence of a separate power supply, the gas valve motor is connected to an unregulated output. If it is necessary to remotely control the operation of the transformer regulator, a lamp can be connected to the unregulated output.
LED indication
The SFPR1 fan speed controller is equipped with LED indicators located on the unit housing. When power is connected to the transformer controller, the indicator will turn green. The red indicator lights up in one of the following cases: motor protection against overheating, lack of air flow or pressure difference, decrease in air flow or pressure difference during operation.
Enclosure
The main purpose of the housing is to protect the internal part of the controller from the ingress of external contaminants and moisture, as well as from adverse environmental factors. The enclosures of our products are produced in-house in order to guarantee their quality and long life. They are made from r-ABS (reinforced Acrylonitrile Butadiene Styrene) with a VO flame-retardant rating. This material is fire-resistant and the enclosure is designed for surface installation. The material is reinforced for enhanced mechanical properties, improved fire safety, and reduced flammability. The protection class of the enclosure is IP54, indicating resistance to dust and water ingress.
The operation of the SFPR1 is based on the use of a built-in autotransformer. It is used to control the voltage applied to the electric motor in five steps, which allows the fan speed to be varied. This technology is very reliable and durable. Sentera’s autotransformers also have a special impregnation to reduce the amount of electrical noise generated. The output voltage generated by the regulator is with a pure sine wave, which ensures quiet operation of the electric motor and increases its service life.
Gas valve control
The SFPR1 series of controllers feature a gas valve output, which opens only when the fan is working properly. When the controller is switched on, the gas valve actuator remains de-energized for one minute. If there is no air flow or pressure difference due to the operation of the fan during this period, the gas supply does not start. This operating logic makes the SFPR1 ideal for industrial kitchens.
Remote control for start and stop
The SFPR1 transformer fan speed controller additionally has a normally closed contact. It can be used to remotely turn the controller on and off, as well as to monitor its operation. Thermostats, temperature relays, etc. are used.
Auto power on after power failure
When working with electrical equipment, you should always be aware of possible power failures. In the event of such a failure, after the power is restored, the speed controller and motor will restart automatically.
Motor protection against overheating
The SFPR1 fan speed controller is equipped with terminals for connecting the thermal motor protection contacts (TK). Thermal contacts are used to measure the temperature on the motor windings. In the event of overheating, the motor will be stopped to eliminate the risk of damage or failure. After the overheating protection trips, the speed controller is restarted manually. If the motor is not equipped with thermal contacts, the TK terminals must be connected together (via a bridge) to simulate its normal operation.
Unregulated output
The SFPR1 speed controller has an additional unregulated output (230 V) that is active when the motor is running. It is called unregulated because it has only two positions - on (230 V) and off (0 V). The maximum current for this output must not exceed 2 A. One example of the use of this output is to control a gas valve motor. In the absence of a separate power supply, the gas valve motor is connected to an unregulated output. If it is necessary to remotely control the operation of the transformer regulator, a lamp can be connected to the unregulated output.
LED indication
The SFPR1 fan speed controller is equipped with LED indicators located on the unit housing. When power is connected to the transformer controller, the indicator will turn green. The red indicator lights up in one of the following cases: motor protection against overheating, lack of air flow or pressure difference, decrease in air flow or pressure difference during operation.
Enclosure
The main purpose of the housing is to protect the internal part of the controller from the ingress of external contaminants and moisture, as well as from adverse environmental factors. The enclosures of our products are produced in-house in order to guarantee their quality and long life. They are made from r-ABS (reinforced Acrylonitrile Butadiene Styrene) with a VO flame-retardant rating. This material is fire-resistant and the enclosure is designed for surface installation. The material is reinforced for enhanced mechanical properties, improved fire safety, and reduced flammability. The protection class of the enclosure is IP54, indicating resistance to dust and water ingress.
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