5.2.13 Electrical Installation, Control Cables
Figure 5.25 Diagram Showing all Electrical Terminals.
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 power 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 Adjustable frequency 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 shielded/armored.
How to Install
VLT
®
HVAC Drive Design Guide
5-24
MG11BB22 - VLT
®
is a registered Danfoss trademark
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