Interference-suppression circuit for overcoupling of 24V control signals Motor controllers/drives Troubleshooting Motors with controllers Troubleshooting Depending on the cable type, routing and length, an overcoupling onto the neighboring control line may occur with 24 V control signals. In motor controllers/drives with wide range inputs (5–24V), this can cause a second input that is not activated to be recognized as high. To prevent this without having to change the wiring (which can be a time-consuming process), the following interference-suppression circuit can be provided at each input in use. Inputs that are not required can be connected directly to the controller ground.
