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.

The digital and analog in- and outputs must be connected separately to the frequency converter 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.

NB!

Control cables must be screened/armoured.

AF-600 FP Design Guide

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