How to solve the EMC problem when the intelligent controller PAC servo is connected?

Solving EMC issues in the interface between the intelligent controller PAC and the servo drive requires addressing interface matching, shielding, and grounding. Interface signals (such as pulse/direction and analog speed commands) should be transmitted differentially, with a common-mode inductor (CMZ20212A-900T) and a TVS (ESDLC5V0D3B) added to the PAC. Shielded twisted-pair cables should be used, with the shielding terminated 360 degrees at both connectors to the metal casing, which in turn connects to the chassis.

For grounding, ensure a good common ground for both the PAC and the servo drive, avoiding potential differences. For analog signals, use an isolation amplifier. During testing, the interface system should operate without error under interference (such as EFT 4kV), with a positioning error of less than ±1 pulse. After these issues are resolved, the system can operate stably in industrial environments, meeting the IEC61800-3 standard.