Problem: After the elevator has been stopped for a period of time, it reports fault code E20-009 upon its first restart.

Inspection: 

1. Check if the elevator guide shoes are too tight;

2. Check if the elevator balance coefficient is appropriate; 

3. Check if the parameters F2-00/F2-01/F2-03/F2-04/F2-11/F2-12/F2-13 are set appropriately;    For the Nice 9000 controller, appropriately increase F3-27 (overspeed margin 0.050~0.300). The F3-27 parameter is used to adjust the allowable speed fluctuation range. When the speed exceeds the value of "(F0-04) + (F3-27)", the system will report E33. Use this parameter with caution for synchronous forced drive elevators. 

4. If the above methods have been tried, consider replacing the main brake as appropriate.