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2 Technical description
2.1 System description
The door drive LDO AC 3.0 is an "intelligent" door drive. Thanks to this drive, the elevator door may
be opening and closing with regulated speeds and accelerations. The maintenance-free door drive
comprises of a control system which is installed inside a housing, and of a drive in the form of a gear
motor. It uses a standard, alternating current, asynchronous motor with a non-self-locking gear.
Toothed belts are used to transfer the driving force. The drive system can be used for operating a
one-sidedly and centrally-opening doors. The driving motor can be manufactured with differently
installed toothed belt pulleys, for doors opened to the right and to the left. The door drive does not
require an end switch. The door widith and the "open" and "closed" positions are determined
automatically. The door status can be transmitted over to the master elevator control using relay
contacts.
2.2 Functions
Door width determination
Door width determination must be triggered as an automatic process within the framework of
assembly and installation. This operation is described in Chapter „4 Assembly and installation" .
The „Door opening" command
The "Door opening" command causes the door to open according to the predetermined motion
curve, as long as the command is present. The "Door opening" command must be present during the
entire opening motion.
The „Door closing" command
The "Door closing" command causes the door to close according to the predetermined motion curve,
as long as the command is present. The "Door closing" command must be present during the entire
closing motion.
The first closing motion after a power outage takes place at slow speed.
!
Only if the door commands last a longer time, the door motor remains in the end positions
under an acting moment.
When no holding moment exists in the "Door closed" position (the command "Door closing" is
not present), the door
closes automatically, when it has been opened for more than 3 increments.
Interruption and reversal of the closing motion
There are three different events that lead to interruption and reversal of the closing motion:
A light barrier attached directly to the door drive signals an interruption of the light ray.
•
The door encounters an obstacle during its closing motion.
•
The door becomes blocked already in the "open" position.
•
If any of these three events is detected, the motion taking place shal be briefly interrupted. This
interruption shall be repeated two times and then the door moves to the "Door open" position and
waits 10 seconds. Next, the still present closing command is executed as normal, and the door closes
in the usual manner again. In case of an interruption of the closing command, the pause ends up
immediately.
10/2015
Page 7 of 24
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