GE Industrial Solutions AF-600 FP Fan and Pump Drive (460V_575V 150HP and above) - Manual (Page 32)

3.3 Electrical Installation - additional
3.3.1 Electrical Installation, Control Cables
Illustration 3.18: Diagram showing all electrical terminals without options.
Very long control cables and analogue 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, it may be necessary to break the screen or insert a 100 nF capacitor between screen and chassis.
The digital and analog inputs and outputs must be connected separately to the frequency converter common inputs (terminal 20, 55, 39) to avoid earth currents
from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal.
AF-600 FP High Power Operating Instructions
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