Danfoss FC 300 Design Manual page 198

8 Electrical Installation
The digital and analog inputs and outputs must be connected separately to the common inputs (terminal 20, 55, 39) of the adjustable frequency drive
to avoid ground currents from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal.
Input polarity of control terminals
NOTE!
Control cables must be shielded/armored.
8
Grounding of Shielded/Armored Control Cables
See section entitled
the correct termination of control cables.
8-40
for
MG.33.BC.22 - VLT ® is a registered Danfoss trademark
FC 300 Design Guide
130BA681.10
130BA681.10