OperationOperating_Manual_Fan_KXE_04_en.docx 83 / 128Refer to chapter 9.3.3 Variable speed controlThe fan itself does not feature an ON/OFF main switch, anEMERGENCY STOP device or EMERGENCY OFF device.Activation and deactivation of the fan must berealised from the control room and must beincorporated in the control system of the plant.Only specialist personnel who have been contractedby the person responsible for the plant may activateor deactivate the fan.In addition, the provisions of the operating companyapply.Allow the fan to run down unbraked following shutdown.The control system of the plant in which the fan is installedmust be configured to ensure that no hazards are posed byshutting down the fan, for example as a result of inflow atinlet, back pressure or reverse flow at discharge.Shut-off devices must be installed and incorporated in thecontrol system of the plant in order to prevent this hazardoussituation.Upon reactivation of the fan, the original state must berestored once again.NOTICE!Refer also to the following chapters- Chapter 3.5.2 Measures in the event of a powerfailure- Chapter 10.5 Minimum speedsRefer to chapter 8.9 Monitoring devices limit values10.1 Regulation via variable speedcontrol10.2 Emergency shutdown10.3 Exceeding limit values