Siemens SIDOOR AT12, Manual, Page: 17 / 48

Functions and device responses
5.6 Blockage detection "CLOSE"
Elevator door drive AT12
Manual, 02/2012, A2B00086683A-04
17
5.6 Blockage detection "CLOSE"
If the door is blocked in the
"CLOSE" direction with a DOOR CLOSE command present, the
door stops and reverses direction.
After reaching the open position, the door closes again at normal speed to within about 2 cm
of the obstacle. It then travels at reduced speed (initial speed) against the obstruction before
reversing again.
This function is repeated continuously, as long as the obstruction remains.
Once the obstruction has been cleared, the door travels at reduced speed to approximately 2
cm past the stored position of the obstruction, and then continues the rest of the way at
normal closing speed.
5.7 Blockage detection "OPEN"
The door stops if it is blocked in the
"OPEN" direction with a DOOR OPEN command
present.
After approximately 2 seconds, the door automatically tries to reach its open position again.
This action is repeated a maximum of three times.
The door then remains stationary in this position.
If the
DOOR OPEN command is canceled, the close command given, and the DOOR OPEN
command is then repeated, the door travels at normal speed to within about 2 cm of the
stored position of the obstruction, and then up to the obstruction at reduced speed.
The door drive stops there, and the opening action is repeated another 3 times.
If the obstruction has been removed beforehand, the door travels at reduced speed to
approximately 2 cm past the stored position of the obstruction, and then continues to its
open position at normal speed.
5.8 Nudge
The door does not automatically reverse in the operating state
NUDGE. The DOOR CLOSE
and
NUDGE commands must be present simultaneously. When an obstruction is detected,
the torque is reduced after one second to the motor's holding shut torque limit.
5.9 Restart after power failure
After a supply voltage failure, the door controller has to redetermine the end positions of the
door travel. To do this, the door travels on command at reduced speed (initial speed) until
the controller has detected both the
"OPEN" and "CLOSED" end positions. The door then
resumes traveling at normal speed.