Electrical Installation, Control Cables - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
How to Install

Electrical Installation, Control Cables

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Diagram showing all electrical terminals. Terminal 37 is not included in FC 301.
Very long control cables and analog signals may in rare cases, depending on installation, result
in 50/60 Hz ground loops due to noise from mains supply cables.
If this occurs, you may have to break the shield or insert a 100 nF capacitor between shield and chassis.
The digital and analog inputs and outputs must be connected separately to the FC 300 common
inputs (terminal 20, 55, 39) to avoid ground currents from both groups affecting other groups. For
example, switching on the digital input may disturb the analog input signal.
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MG.33.B3.22 - VLT is a registered Danfoss trademark