EVS-1 series are electronic fan speed controllers with analogue input. They regulate the speed of single-phase voltage controllable motors with a maximum current of 10 A. The AC fan speed is controlled by varying the motor voltage via phase angle control - Triac technology. The minimum and maximum speed is adjustable via trimmers. The motor voltage can be regulated via the analogue input or via Modbus RTU. Kick start or soft start acceleration and the operating mode is selectable via Modbus RTU.