Electrical Installation, Control Cables - Danfoss VLT Automation Drive FC 300 Instruction Manual

VLT ® Automation Drive FC 300
Instruction Manual High Power

3.8.1 Electrical Installation, Control Cables

Figure 3.50: 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 section
frequency drive Design Guide. See also sections Safe Stop and Safe Stop Installation.
In rare cases, very long control cables and analog signals may, depending on installation, result in 50/60 Hz ground loops due to noise from line power
supply cables.
If this occurs, it may be necessary to break the shield or insert a 100 nF capacitor between shield and chassis.
The digital and analog in- and outputs must be connected separately to the adjustable frequency drive common inputs (terminal 20, 55, 39) to avoid
ground currents from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal.
MG.33.U2.22 - VLT ® is a registered Danfoss trademark
3 How to Install
Safe Stop Installation in the adjustable
3
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