5.3.12 Control Cable Length
Digital in / digital out
Dependent on what kind of electronics is being used, the maximum cable
impedance may be calculated based on the 4 kΩ frequency converter
input impedance.
Analog in / analog out
Again the electronics used puts a limitation on the cable length.
NB!
Noise is always a factor to be reckoned with.
5.3.13 Electrical Installation, Control Cables
Illustration 5.22: Terminal 37: Safe Stop input available with Safe Stop Function only!
Very long control cables and analog 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, you may have to break the screen or insert a 100 nF capacitor between screen and chassis.
VLT
®
AQUA Drive Design Guide 5 How to Install
MG.20.N5.02 - VLT
®
is a registered Danfoss trademark
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