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

3. How to Install

3.7.1. Electrical Installation, Control Cables

3
Illustration 3.82: Diagram showing all electrical terminals without options.
Terminal 37 is the input to be used for Safe Stop. For instructions on Safe Stop installation please refer to
the section
Safe Stop Installation.
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 analog in- and outputs must be connected separately to the frequency converter
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.
64
Safe Stop Installation
in the frequency converter Design Guide. See also sections Safe Stop and
MG.33.U1.02 - VLT
Operating Instructions High Power
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VLT Automation Drive FC 300