| Main protection of electronic control system | ||
| 1 | Overroll | The overwinding switch is actuated or the PLC calculates that the height is overwinding, and the hoist is braked urgently. |
| 2 | Overspeed of elevator | The elevator running speed exceeds the maximum speed by 15%, and the elevator emergency brakes |
| 3 | Speed limit protection | When the lifting container reaches the terminal position, it exceeds the limit and the hoist brakes urgently. |
| 4 | Overload and undervoltage | Elevator emergency brake |
| 5 | Depth indicator failure | When the indicator fails, the hoist will be braked urgently |
| 6 | Gate gap protection device | When the gate gap exceeds the specified value, it will automatically alarm |
| 7 | Slack Rope Protection | Automatically cut off power and alarm when the wire rope is loose |
| 8 | Wrong running direction | The running direction and speed of the elevator are inconsistent with the given direction, and the elevator is emergency braked. |
| 9 | Emergency stop at the operating table | Elevator emergency brake |
| 10 | Signal system emergency stop | Elevator emergency brake |
| 11 | Fault of frequency conversion speed regulating device | Elevator emergency brake |
| 12 | Hydraulic station failure | Elevator emergency brake |
| 13 | Mine car derailment protection | Elevator emergency brake |
| Main protection functions of the frequency conversion speed regulation device itself | ||
| 14 | Motor overload protection | 1.2le Overload for 2 minutes, the frequency conversion speed control device is activated and the hoist is braked |
| 15 | Under/over voltage protection | Elevator emergency brake |
| 16 | Phase failure protection | Elevator emergency brake |
| 17 | Instantaneous power failure protection | The elevator is in emergency braking, and the power supply system cannot start automatically |
