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Fan speed controller | Modbus RTU | 115 - 230 VAC | 2,5 A

Article code RTVS8-25L22
GTIN 0.540.100.301.833.0
Intrastat number
Category Single-phase motor controls 115 - 230 VAC
Current stock 5 U.
Factory lead time 4 Week(s)

Product description

Transformer fan speed controller with Modbus RTU communication for manually or demand-based fan speed regulation. The supply voltage ranges from 115 to 230 VAC. It is used for single-phase motors. The maximum motor current (combined) is 2.5 A. Modbus communication is used to control the RTVS8 serie.

The fan speed is controlled by gradually varying the motor voltage. The autotransformer technology produces a perfect sinusoidal motor voltage. This ensures that the motor runs quietly. The electrical noise from the autotransformers is reduced by a special impregnated coating.

To adjust the requested fan speed a potentiometer (SPV series), Modbus I/O module, or BMS system can be used. The fan speed can also be adjusted based on the temperature, relative humiudity, CO2 and air quality (TVOC).

Surface mounting is possible (IP54 protection).

Additional specifications and description

Why use a transformer fan speed controller
Transformer controllers offer a straightforward and cost-effective solution for speed control of most electric motors. One significant benefit of these control units is the ability to adjust the motor speed without generating electromagnetic excitation. This feature makes transformer-based control units highly suitable for noise-sensitive environments. Although the controller produces some noise, the controlled motor works silently and smoothly. So, by opting for a transformer fan speed controller, you can enjoy silent motor operation, easy stepped control, and a long-lasting controller at an affordable price.

About Modbus RTU communication
This protocol has gained widespread acceptance as a serial protocol due to its user-friendly nature and reliability. Modbus RTU finds extensive application in Building Management Systems (BMS) and Industrial Automation Systems (IAS).
This fan speed controller can be operated via 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, the fan speed controller offers the flexibility of connecting various devices for automated control. Options include the integration of a Sentera HVAC sensor, a DADCM 0-10 V module, or an SPV-series digital potentiometer to the RTVS8 controller. The specific connected device can be selected and specified via Modbus register 18. The fan speed is then controlled by the connected device. Therefore, in automatic mode, the fan speed can be precisely regulated through a 0-10 V signal, which can be based on parameters such as temperature, relative humidity, CO2 levels, air quality (TVOC), carbon monoxide levels, or the SPV-series potentiometer.
Thanks to Modbus RTU, the fan speed controller provides a versatile and customizable solution for efficient fan speed control, whether through manual adjustment or automated regulation based on various environmental factors.

Modes of operation
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. Whether operating in manual or automatic mode, the fan speed controller provides a versatile solution for effectively managing airflow and maintaining desired indoor conditions.

Forward or reverse
When operating the fan speed controller in automatic mode, users have the option to choose between forward or reverse mode. In forward mode, as the measured value increases, the fan speed will also increase. On the other hand, in reverse mode, the fan speed decreases as the measured value increases. This mode offers a different control strategy where the fan slows down as the environmental conditions improve or reach the desired setpoints.

Extra output
The controller features an extra, unregulated output (115 - 230 VAC,  depending on the supplied voltage). It can be selected via Modbus register 19. The functionality of this output can be configured using Modbus register 19. By default, the unregulated output is set to indicate alarms, providing a visual signal in case of faults. Alternatively, the unregulated output can be controlled through Modbus register 15. 
Thermal motor protection
The fan speed controller features monitoring thermal motor contacts (TK), which measure the temperature of the motor windings. This feature is important for ensuring the safe operation of the motor. In the event of motor overheating, the TK monitoring function is designed to automatically disable the motor to prevent any potential motor damage. However, not all motors may be equipped with TK contacts. In such cases, it is necessary to disable the TK monitoring function in order to avoid any compatibility issues or unnecessary alarms. This is done via Modbus register 14 by disabling the TK monitoring function when no TK contacts are present.

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.

Remarks, reviews & ratings

Konstrukcja produktu pozwala na łatwy montaż, jest on doskonale chroniony przez obudowę. Część zasilająca realizowana jest za pomocą transformatora – rozwiązanie niezwykle niezawodne, sprawdzone w czasie. Połączenie ze sterowaniem elektronicznym sprawia, że produkt jest wysokiej jakości, elastyczny i nowoczesny (usuwa dostęp i kontrolę). Można go zintegrować z różnymi produktami – czujnikami, silnikami itp., co czyni go elastycznym w rozwiązaniu zapewniającym czyste i świeże powietrze
Laba universalus reguliatorius, tvirtas korpusas, paprastas montuoti.
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