Automatic fan speed controller for AC fans with single-phase motor. The maximum motor current is 6 A per output (2x 6 A). Fan speed is regulated automatically based on the measurements of the connected HVAC sensors. Up to 4 HVAC sensors can be connected via the RJ45 socket (Power over Modbus). Additionally, there are 2 analogue inputs, 2 analogue outputs and 2 tacho inputs available. Application dedicated firmware can be downloaded via SenteraWeb. The built-in internet gateway can be connected via a LAN cable or via WiFi. The supply voltage is 230 VAC.