Program features 173
Rescue operation
Rescue operation can be used in emergency evacuation situations where the
elevator car has to be run to the next floor because of a power supply failure. In such
a situation, the drive is supplied by an external emergency power supply and is,
thereby, switched to the low voltage mode. The elevator controller takes care of
switching between the mains supply and the low voltage supply.
Due to derated power supply, the elevator car traveling speed needs to be reduced
during a rescue operation. For this, the drive uses the evacuation mode (evacuation
speed). Two evacuation options, automatic and manual evacuation, are available.
• In automatic/recommended mode, the drive stores the lighter load direction
automatically at each start and uses that direction.
• In automatic evacuation, the drive searches the lighter load direction (up or down)
and then automatically runs the elevator car to that direction.
• In manual evacuation, the elevator controller decides and issues the direction of
travel.
The operation sequence during a rescue operation is as follows:
1. Power failure occurs and the drive trips.
2. Elevator controller detects a power failure.
3. Elevator controller cancels the normal operation commands.
4. Elevator controller disconnects the mains supply to the drive.
5. Elevator controller connects the low voltage supply to the drive.
6. Elevator controller activates the low voltage and evacuation modes (precondition:
the drive is ready to run).
7. Elevator controller issues a start up or start down command.
8. Drive finds the lighter load travel direction (if automatic evacuation is selected).
9. Drive starts to operate at the evacuation speed.
10. Drive stops when the floor limit switch is activated (or when the start command is
removed).
Switching back to normal mains supply is carried out as follows:
1. Drive is at a stopped state.
2. Elevator controller deactivates the evacuation mode.
3. Elevator controller disconnects the low voltage supply to the drive.
4. Elevator controller reconnects the mains supply to the drive.
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