Evacuation operation elevator control
In the event of a power failure, many elevator systems automatically switch to a so-called network replacement such as an emergency generator or a UPS. This guarantees an automatic evacuation trip to at least the next stop and the opening of the elevator door.
If the main feed of the elevator system fails, the UPS should be switched over automatically.
The PFD3-E12 monitors the phase voltage for total failure. The output relay switches to the UPS if the main supply fails. The car can be moved at the speed of evacuation due to the emergency supply.