In reality, we often hear a passenger "This elevator slide scared me, from a certain floor suddenly dropped to a certain floor.。In fact, this is not a falling ladder at all, but a kind of safety protection function of the elevator: "correction"。
The so-called "correction" refers to the reset measures that the elevator detects a system error during operation。For example, the door lock is suddenly disconnected and immediately closed, the floor position is confused, and the security protection signal is abnormal。When the motherboard recognizes that a system is not normal, it will send a correction signal to allow the elevator to reset at the rated correction speed to the base station location, in fact, this is just like our computer restart。
When the elevator motherboard recognizes that the floor position is abnormal, it will stop the output communication signal, and only the reset signal is retained。If the elevator fails in 9, the display board in the elevator will display "9", and the floor is unchanged in the process of the elevator reset. When the elevator is corrected and reset to the first floor, the motherboard immediately outputs the communication signal after the system is normal, and the display board will change to "1".。This is a normal correction。The passengers had the illusion that the floor changed from 9 to 1 instantly, and that the elevator fell from 9 floors to 1 instantly, and the ladder fell。In fact, this is actually "elevator automatic correction".。

Encounter similar situations, please consult the property or professional, do not misinformation, cause panic。

What is the reason why the elevator suddenly fell？
There are two main types of sudden fall, one is when the elevator starts and arrives at the station and the other is during the operation。One of them is mainly due to the reason that the comfort is not adjusted well, which belongs to the elevator debugging problem, which can be completed by adjusting the weighing device and doing the weighing test and parameter modification。The second is divided into two kinds, one is the slide, the other is the elevator failure caused by sudden stop。Nowadays, there are few elevators like real slides。However, people often regard the elevator fall caused by the sudden stop of the elevator as a slide。
Second, the slide and slide layer will not cause harm to passengers
In the event of a fault or abnormal signal, the normal operation of the elevator will cancel the originally registered floor signal, and replace it with instructions such as slowing down, stopping or automatically correcting the operation。
The elevator will suddenly slow to a halt，At the same time, the elevator control system is self-checked，After the general fault is automatically eliminated，The elevator operates at a relatively slow speed on the level position of the nearby floor or on the base station (usually located on the floor of the building) for position correction，It's like a computer reboot，Then automatically open the door.，Release passengers，The elevator is in standby mode。
If the fault abnormal signal can not be automatically eliminated, it will cause the passengers trapped in the elevator, then there is no need to panic, the elevator brake system will firmly control the car, protect the safety of passengers and equipment itself, will not occur the so-called fall。Under normal circumstances, the so-called "slide" phenomenon does not cause harm to passengers。
Third, the cause of slide and slide layer and preventive measures
1, the floor door or car door in the use of the process of collision or artificial door, there are plastic bags and other foreign bodies in the well hanging in the door lock, so that the car in the operation of the instant to open the door, or maintenance of the door system related parts of the gap is not adjusted in place, resulting in the door electrical interlock device interrupted in the elevator operation process。
Suggestions: When taking the ladder, you should avoid the collision of the body or objects on the elevator door or the artificial door, do not throw garbage from the gap between the car and the hall door into the well, and prohibit jumping and other behaviors in the car。
2. During the decoration period, due to debris and dust, electrical contacts are not in good contact, foreign bodies in the floor slide cause the door to be stuck, and the power supply is abnormal, which can cause the elevator to stop during operation。
Suggestion: Standardized management, guide users to take the ladder civilized。
3, the elevator button motherboard damage caused by floor registration signal conflict or interference。
Suggestion: When selecting the floor, tap the floor or direction button that needs to be reached, especially to educate the child not to press all the elevator floor buttons because of fun, in order to avoid causing the elevator control system to misjudge。
4, the level sensor can not sense the position of the elevator car, or detect the position of the elevator car is not consistent with the preset position, that is, split-level phenomenon。