Danfoss VLT AQUA Drive Design Manual page 95

VLT ® AQUA Drive Design Guide
5.2.12. Electrical Installation, Control Cables
5.16: Terminal 37: Safe Stop input available with Safe Stop Function only!
In rare cases, and depending on the installation, very long control cables and analog signals may
result in 50/60 Hz ground loops due to noise from line supply cables.
If this occurs, you may have to break the shield or insert a 100 nF capacitor between shield and
chassis.
The digital and analog in- and outputs must be connected separately to the VLT AQUA Drive
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.
NOTE
Control cables must be shield/armored.
MG.20.N2.22 - VLT ® is a registered Danfoss trademark.
5. How to Install
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