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

3. How to Install

3.5.1. Electrical Installation, Control Cables

3
Illustration 3.12: Diagram showing all electrical terminals without options.
Terminal 37 is the input to be used for Safe Stop. For instructions on Safe Stop installation please refer to
the section
* Terminal 37 is not included in FC 301 (Except FC 301 A1, which includes Safe Stop).
Terminal 29 and Relay 2, are not included in FC 301.
Very long control cables and analogue signals may in rare cases and depending on installation
result in 50/60 Hz earth loops due to noise from mains supply cables.
If this occurs, it may be necessary to break the screen or insert a 100 nF capacitor between screen
and chassis.
The digital and analogue in- and outputs must be connected separately to the FC 300 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.
32
Safe Stop Installation
in the FC 300 Design Guide.
MG.33.A9.02 - VLT is a registered Danfoss trademark
®
VLT AutomationDrive FC 300 Operating
Instructions