Example:616869+e30bb489.10RS485Illustration 38: Serial Communication Wiring Diagram5.11.9 Safe Torque Off (STO) WiringThe Safe Torque Off (STO) function is a component in a safety control system. STO prevents the unit from generating the voltagerequired to rotate the motor. To run the STO function, more wiring for the drive is required. Refer to the VLT® FC Series - Safe Torque OffOperating Guide.5.11.10 Space Heater WiringThe space heater is an option used to prevent condensation from forming inside the enclosure when the unit is turned off. It is fieldwired and controlled by an HVAC management system.Specifications:• Nominal voltage: 100–240• Wire size: 12–24 AWG (4–0.25 mm2)5.11.11 Auxiliary Contact Wiring for DisconnectsThe disconnect is an option that is installed at the factory. The auxiliary contacts, which are signal accessories used with the disconnect,are not installed at the factory to allow more flexibility during installation. The contacts snap into place without the need for tools.Contacts must be installed in specific locations on the disconnect depending on their functions. Refer to the datasheet included in theaccessory bag that comes with the drive.Specifications:Electrical InstallationOperating Guide | VLT® AutomationDrive FC 302AQ275652476278en-000101 / 130R0709| 63Danfoss A/S © 2019.12
