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Fan speed controller | Modbus RTU | 115 - 230 VAC | 3,5 A

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Article code RTVS8-35L22
GTIN 0.540.100.301.834.7
Intrastat number
Category Single-phase motor controls 115 - 230 VAC
Current stock 3 U.
Factory lead time 4 Week(s)

Product description

Transformer fan speed controller with Modbus RTU communication. Supply voltage is 115 - 230 VAC. It controls single phase motors. The maximum motor current is 3.5 A

The fan speed is regulated by varying the motor voltage in steps. Autotransformer technology produces a perfectly sinusoidal motor voltage. This ensures quiet operation of the motor. A special impregnated coating reduces electrical noise from the autotransformer.

RTVS8 series are controlled by Modbus communication. The required fan speed can be set using potentiometers(SPV series), Modbus I/O modules or BMS systems or can be set depending on temperature, relative humidity, CO2 and air quality (TVOC)

The housing can be surface mounted (protection class IP54).

Additional specifications and description

Why choose this 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! 
This controller features Modbus RTU, which is a serial protocol derived from the master/slave architecture. It is widely used because of its user friendliness and reliability. Modbus RTU has turned into standard when it comes to building management systems and industrial automation. 

Operation 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. In manual mode, 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.Fan speed controller with a potentiometer

Forward or reverse
When automatic mode has been selected, forward or reverse mode can be set. 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.

Extra 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. In general it is intended for relay control. 
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 in order to prevent motor damage. If the motor is not equipped with TK contacts, the TK monitoring function must be disabled via Modbus register 14.

Automatic 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 LEDs on the enclosure. They are intended for indicating the status of the device – powered, active Modbus communication, alarms, unregulated output status and currently active step. 

High-quality enclosure
The enclosure is made of high-quality r-ABS plastic and in order to guarantee its good quality, we manufacture our own enclosures. 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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