Eibabo recommendations and tips for the purchase of KNX blinds: KNX blind actuators can be used to automate all motorized devices such as blinds or shutters. Standard 230V shutter actuators therefore have 2 channels per switching output. A channel for opening and a channel for closing. The channels are interlocked so that the drive is not damaged. Thus, only one phase can be connected to the drive at a time, never both simultaneously. For this reason, no KNX switching actuators may be used for blinds or shutters. Motorized 3-point drives must not be connected in parallel. Group formation may only be carried out via isolating relays or group control units, if no separation function is provided by the manufacturer. For example, for 4 windows with one drive each, one should use a KNX blind actuator with 4 channels. There is also the possibility to operate several drives via one channel by means of conventional isolating relays. The blind actuator channel then activates the isolating relays and the drives are connected to the isolating relay. Meanwhile, however, prices for KNX actuators have fallen considerably, which means that this necessity for reducing costs is quite infrequent. Take into account the voltage type of the drives. Accordingly, you also need the appropriate KNX blind actuators. Eibabo sells KNX blind actuators, KNX shutter actuators and KNX SMI actuators from ABB, Berker, Busch-Jaeger, Gira, Hager, Issendorf, Jung, Lingg & Janke, MDT, Merten, Siemens, Somfy, Theben, Warema and many other manufacturers. The drives of blinds or shutters are often designed as 230V AC (alternating current or 24V DC (direct current). Therefore you have to buy the appropriate blind actuator or shutter actuator. A 24V DC blind or shutter actuator has a plus and a minus connection. The direction of travel (up / down) is produced by polarity reversal (polarity reversal). The 24 V DC power supply is not ensured by the actuator and must be installed externally depending on the power requirement for simultaneity (central commands). In this case, very large power supply units can be necessary, which in addition to high costs also have a large space requirement. Ideally, 230V AC drives should be ordered from the supplier. Furthermore, there are SMI (standard motor interface) KNX blind actuators for drives with SMI interface. These intelligent drives have a uniform interface for exchanging data telegrams also across manufacturers. In any case, it should be ensured that the blind actuator or shutter actuator also has a 1 byte communication object for each running time and slat in order to enable automatic control depending on the sun's position. For shutters, there are no slats, so shutter actuators do not have the communication object slat, only up / down / stop. Shutter actuators often have a 1-bit object for a defined, fixed position travel adjusted by means of the ETS. 1 byte means that values between 0-255 can be operated which corresponds to 0-100% in relation to the travel time. The parameters often allow run time setting depending on travel time. The travel time of the blinds or shutters is entered once in the actuator by means of the ETS software for one complete travel up respectively down for each channel of the actuator. There are also actuators for evaluating limit switches which the motor drive provides. EIB, KNX blind actuators are available for all types of mounting options at eibabo. For example, for installation in the electrical distribution, you have the addition 'REG' for top hat rail mounted or as flush-mounted type „UP' for installation in an installation box or branch box or as a built-in version 'EB' for integration in ducts or similar devices. However, additional protection must also be ensured for built-in versions depending on the installation.