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EU declaration conformity
Fan speed controller | Modbus RTU | 115 - 230 VAC | 1,5 A
Product description
Transformer fan speed controller with Modbus RTU interface. The supply voltage is 115 - 230V AC. Single-phase motors of the RTVS8 series are controlled via Modbus protocol. The maximum motor current is 1.5 A
Fan speed is controlled by varying the motor voltage in steps. The autotransformer technology produces a perfectly sinusoidal motor voltage. This ensures quiet motor operation. A special impregnation coating reduces electrical noise from the autotransformer.
The required fan speed can be regulated using Sentera potentiometers (SPV series), Modbus I/O modules or BMS systems. it can also be controlled with our Sentera HVAC sensors depending on temperature, relative humidity, CO2 and air quality (TVOC).
The housing can be surface mounted. The protection class is IP54.
Additional specifications and description
Why choose a transformer fan speed controller
Most electric motors are voltage controllable. Transformer controllers are a simple, convenient and cost-effective speed control solution. Another major advantage of transformer-based control units is speed control without electromagnetic excitation in the motors. The products are therefore also recommended for noise-sensitive areas. So, what you get by a transformer fan speed controller is: silent motor operation, simple control in steps and a controller with a long service life at a reasonable price!
Transformer controller with Modbus RTU communication
Modbus RTU is an open serial protocol derived from the master/slave architecture. It is a widely accepted serial level protocol due to its ease of use and reliability. Modbus RTU is widely used within Building Management Systems (BMS) and Industrial Automation Systems (IAS).
This fan speed controller requires a Modbus RTU control signal. In manual mode, this can be done via a BMS system or a Modbus RTU slave device. The requested fan speed is written in Modbus register 12. In automatic mode, a Sentera HVAC sensor, a DADCM 0-10 V module or SPV-series digital potentiometer is connected to the RTVS8 controller. The connected device can be specified via Modbus register 18. Fan speed is controlled via the connected device. So in automatic mode, fan speed can be controlled via a 0-10 V signal, based on temperature, relative humidity, CO2, air quality (TVOC), CO or the SPV-series potentiometer.
Automatic or manual mode
The unit can be controlled both in automatic mode or in manual mode. In manual mode, the unit functions as a 5-step controller. In automatic mode, the unit can be connected to a Sentera device allowing the unit to be used for demand-based ventilation.
Forward or reverse?
In automatic mode, forward or reverse mode can be selected. Forward mode means that the fan speed will increase when the measured value increases. In reverse mode, fan speed will be reduced when the measured value increases.
Unregulated output
The functionality of the extra, unregulated output (115 - 230 VAC, depending on the supplied voltage) can be selected via Modbus register 19. By default, it indicates alarms. It can also indicate motor operation or it can be controlled via Modbus register 15.
Thermal motor protection
This fan speed controller can monitor thermal motor contacts (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, disable the TK monitoring function via Modbus register 14.
Auto restart after power failure
In case of a power failure, this controller will automatically reset itself. When the power is restored, the motor will restart automatically.
LED indication
The RTVS8 features indication lights on the enclosure. These indicate the status of the device – powered, active Modbus communication, alarms, unregulated output status and currently active step.
Solid enclosure
The enclosure is made of high-quality r-ABS plastic and in order to guarantee its impeccable quality, it is manufactured in our own factory. The material is exceptionally heat resistant, very tough and offers good protection against impacts. The enclosure can be surface mounted and offers an IP54 protection against ingress of dirt, dust and moisture.
Most electric motors are voltage controllable. Transformer controllers are a simple, convenient and cost-effective speed control solution. Another major advantage of transformer-based control units is speed control without electromagnetic excitation in the motors. The products are therefore also recommended for noise-sensitive areas. So, what you get by a transformer fan speed controller is: silent motor operation, simple control in steps and a controller with a long service life at a reasonable price!
Transformer controller with Modbus RTU communication
Modbus RTU is an open serial protocol derived from the master/slave architecture. It is a widely accepted serial level protocol due to its ease of use and reliability. Modbus RTU is widely used within Building Management Systems (BMS) and Industrial Automation Systems (IAS).
This fan speed controller requires a Modbus RTU control signal. In manual mode, this can be done via a BMS system or a Modbus RTU slave device. The requested fan speed is written in Modbus register 12. In automatic mode, a Sentera HVAC sensor, a DADCM 0-10 V module or SPV-series digital potentiometer is connected to the RTVS8 controller. The connected device can be specified via Modbus register 18. Fan speed is controlled via the connected device. So in automatic mode, fan speed can be controlled via a 0-10 V signal, based on temperature, relative humidity, CO2, air quality (TVOC), CO or the SPV-series potentiometer.
Automatic or manual mode
The unit can be controlled both in automatic mode or in manual mode. In manual mode, the unit functions as a 5-step controller. In automatic mode, the unit can be connected to a Sentera device allowing the unit to be used for demand-based ventilation.
Forward or reverse?
In automatic mode, forward or reverse mode can be selected. Forward mode means that the fan speed will increase when the measured value increases. In reverse mode, fan speed will be reduced when the measured value increases.
Unregulated output
The functionality of the extra, unregulated output (115 - 230 VAC, depending on the supplied voltage) can be selected via Modbus register 19. By default, it indicates alarms. It can also indicate motor operation or it can be controlled via Modbus register 15.
Thermal motor protection
This fan speed controller can monitor thermal motor contacts (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, disable the TK monitoring function via Modbus register 14.
Auto restart after power failure
In case of a power failure, this controller will automatically reset itself. When the power is restored, the motor will restart automatically.
LED indication
The RTVS8 features indication lights on the enclosure. These indicate the status of the device – powered, active Modbus communication, alarms, unregulated output status and currently active step.
Solid enclosure
The enclosure is made of high-quality r-ABS plastic and in order to guarantee its impeccable quality, it is manufactured in our own factory. The material is exceptionally heat resistant, very tough and offers good protection against impacts. The enclosure can be surface mounted and offers an IP54 protection against ingress of dirt, dust and moisture.
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