How to ensure reliability in industrial servo systems during voltage dips?

The servo system must ensure no tripping or damage during brief voltage dips or interruptions in the mains power grid (IEC 61000-4-11), and must resume normal operation quickly after voltage recovery. Eintec Electronics' reliability design includes:

1) In hardware, increasing the DC bus capacitor value to store more energy and support continuous operation during voltage dips (e.g., 20ms).

2) Employing a rectifier circuit with a wide input voltage range (e.g., 300-460VAC).

3) Adding "restart after voltage dip" logic to the software control algorithm: when a voltage dip is detected, reducing output power or entering a free-stop mode; after voltage recovery, smoothly restarting the motor at a preset slope to avoid inrush current.

4) Storing critical status data (e.g., current position, parameters) in non-volatile memory.

Through these measures, the servo system can meet Class 2 or Class 3 voltage dip immunity requirements (e.g., a drop to 40% of rated voltage for 10 cycles), improving reliability in unstable power grid environments.