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

3 How to Install

3.5.1 Electrical Installation, Control Cables

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Illustration 3.21: Diagram showing all electrical terminals without options.
A = analog, D = digital
Terminal 37 is 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).
Relay 2 and Terminal 29, have no function 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 inputs and outputs must be connected separately to the common inputs (terminal 20, 55, 39) of the frequency converter to
avoid ground currents from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal.
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MG.33.AC.02 - VLT is a registered Danfoss trademark
®
VLT AutomationDrive FC 300 Operating
Safe Stop Installation
of the Design Guide.
Instructions