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EU declaration conformity
Fan speed controller | Modbus RTU controlled | 1,5 A
Product description
This transformer fan speed controller controls fan speed manually or on demand. It controls single-phase motors. The maximum motor current (combined) is 1.5 A. The power supply voltage is 230 volts.
Modbus connectivity is used to operate RTVS1. The required fan speed may be adjusted using a Sentera HVAC sensor, potentiometer (SPV series), or a BMS system with Modbus RTU communication. Fan speed may be set manually or automatically based on temperature, relative humidity, CO2, air quality (TVOC), or CO.
The fan speed is controlled by gradually adjusting the motor voltage. The autotransformer technique produces a perfect sinusoidal motor voltage. This ensures that the motor runs quietly. The electrical noise from the autotransformers is reduced using a unique impregnated coating.
Surface mounting of the plastic enclosure is possible (IP54 protection).
Additional specifications and description
Modbus RTU controlled
Autotransformer technology is used to reduce the motor voltage and the fan speed in 5 steps. This speed controller is therefore only suitable for voltage controllable motors. If you are not sure whether your motor is voltage controllable, it is best to contact the motor manufacturer or read carefully its accompanying documentation. This fan speed controller requires a Modbus RTU control signal to activate one of the available speed levels.
In manual mode, a BMS system or a Modbus RTU master device can select the desired fan speed in Holding register 12.
In automatic mode, a Sentera HVAC sensor or SPV-series potentiometer is connected to the RTVS1 controller. The connected device must be specified via Modbus register 18. Fan speed is controlled via the connected device. So in automatic mode, fan speed can be controlled based on temperature, relative humidity, CO2, air quality (TVOC), CO or the SPV-series potentiometer. In combination with DADCM, RTVS1 series can be controlled via a 0-10 Volt analogue input signal.
In manual mode, a BMS system or a Modbus RTU master device can select the desired fan speed in Holding register 12.
In automatic mode, a Sentera HVAC sensor or SPV-series potentiometer is connected to the RTVS1 controller. The connected device must be specified via Modbus register 18. Fan speed is controlled via the connected device. So in automatic mode, fan speed can be controlled based on temperature, relative humidity, CO2, air quality (TVOC), CO or the SPV-series potentiometer. In combination with DADCM, RTVS1 series can be controlled via a 0-10 Volt analogue input signal.
Increase or decrease fan speed when temperature rises?
In automatic mode, fan speed can increase or decrease as the control signal increases. These operating modes are called Auto forward and Auto reverse mode. One of these operating modes can be selected via Holding register 11. Auto forward mode means that the fan speed will increase when the measured value increases. In Auto reverse mode, fan speed will be reduced when the measured value increases.
Unregulated output
The functionality of the extra, unregulated output (230 VAC) 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. When the unregulated output is active, it provides 230 Volt output voltage.
Thermal motor protection
This fan speed controller can monitor TK or thermal motor contacts. Thermal contacts measure temperature inside 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, the TK monitoring function can be disabled via Modbus Holding register 14. By default, the TK monitoring function is disabled. So if your motor has thermal contacts and they are connected to the RTVS1 controller, do not forget to activate this function via Holding 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.
Solid enclosure
Make sure that the fan speed controller can cool sufficiently. Preferably install it in a cool place, best not in direct sunlight. The enclosure is designed and manufactured in-house. This way Sentera can guarantee its fine quality. The enclosure is made of high-quality r-ABS plastic. This 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. This fan speed controller can be installed on a wall or panel indoors.
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