3.8. Electrical Installation - continued3.8.1. Electrical Installation, Control Cables3.82: Diagram showing all electrical terminals without options.Terminal 37 is the input to be used for Safe Stop. For instructions on safe stop installation, refer to the sectionSafe Stop Installation in the adjustable frequency drive Design Guide. See also sections Safe Stop and SafeStop Installation.In rare cases, very long control cables and analog signals may, depending on installation, resultin 50/60 Hz ground loops due to noise from line supply cables.If this occurs, it may be necessary to break the shield or insert a 100 nF capacitor between shieldand chassis.The digital and analog inputs and outputs must be connected separately to the adjustable fre-quency drive common inputs (terminal 20, 55, 39) to prevent ground currents from both groupsVLT® HVAC DRIVE High PowerInstruction Manual 3. How to InstallMG.11.F1.22 - VLT® is a registered Danfoss trademark. 673
