Emergency Operation

Emergency Operations


There are three types of Emergency Operations: Emergency Operations under Power Failure, Fire Emergency Operations, and Earthquake Emergency Return Operations.


Flowcharts for the movement of elevators and related equipment during emergencies are provided below for elevator owners.


Emergency Operation Under Power Failure:

Two types of operations: Operation by Emergency Power Source (OEPS), and Operation by Mitsubishi Emergency Landing Device (MELD).


Operation by Emergency Power Source (OEPS)
Without Supervisory Panel

With Supervisory Panel

Operation by Mitsubishi Emergency Landing Device (MELD)

Fire Emergency Operations:

Two types of operations: Fire Emergency Return Operation (FER), and Fireman’s Emergency Operation (FE).

Fire Emergency Return Operation (FER)

Fireman’s Emergency Operation (FE)

Earthquake Emergency Return Operations:

Elevator cars are moved to nearest floors when an earthquake is detected by seismic sensors.

Two types of operations: Primary Wave Earthquake Emergency Return Operation (EER-P), initiated if primary seismic waves are detected, and Secondary Wave Earthquake Emergency Return Operation (EER-S), initiated if secondary seismic waves are detected.

Primary Wave Earthquake Emergency Return Operation (EER-P)


Secondary Wave Earthquake Emergency Return Operation (EER-S)