GE Industrial Solutions AF-650 GP General Purpose Drive (230V to 50HP, 460_575V to 100HP) - Manual (Page 30)

3.5.1 Electrical Installation, Control Cables
Illustration 3.21: Diagram showing all electrical terminals without options.
Terminal 37 is the input to be used for Safe Stop. For instructions on Safe Stop installation please refer to the section Safe Stop Installation of the AF-650 GP
Design Guide.
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 analogue inputs and outputs must be connected separately to the common inputs (terminal 20, 55, 39) of the frequency converter to avoid ground
currents from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal.
AF-650 GP Operating Instructions
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