How to suppress lightning strikes in motion controller MC?

Suppressing lightning-induced overvoltages in the motion controller (MC) requires a multi-level protection system. First-level surge protectors, typically gap-type or varistor-type, should be installed at the system power and signal line inlets. Inside the equipment cabinet, a second-level protection circuit should be installed for the controller ports, consisting of gas discharge tubes, varistors, and TVS diodes for multi-stage discharge and clamping. Signal line protectors must be low-capacitance type. All protective devices should have short, thick ground wires connected to an independent lightning protection grounding busbar, which should be connected to the equipment's operating ground at a single point.

Cables should be run through metal conduits or cable trays, with both ends grounded. Long outdoor cables can have protectors installed in the middle. Inside the module, sensitive circuits should be isolated for power supply and signal transmission. Equipotential bonding should be implemented, connecting the equipment casing, cable shielding, and surge protector grounding terminals at the inlets. The design must comply with lightning protection standards and be verified through simulated lightning strike testing.