Motor Cables - Danfoss FC 300 Design Manual

FC 300 Design Guide
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 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 inputs and outputs must be connected separately to the FC 300 common
inputs (terminal 20, 55, 39) to avoid letting ground currents from both groups affect other groups.
For example, switching on the digital input may disturb the analog input signal.
Input polarity of control terminals
See section entitled
Armored Control Cables
nation of control cables.

6.3.10. Motor Cables

See section
length.
•
NOTE
Control cables must be shielded/armored.
Grounding of Shielded/
for the correct termi-
General Specifications
for correct dimensioning of motor cable cross-section and
Use a shielded/armored motor cable to comply with EMC emission specifications.
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
6. How to Install
6
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