20
Motor-driven lock for narrow stile profiles
Installation instructions
B 1956 / B 1959
10.2016 | 19651S | Printed in Germany
EN
3.3 Manual unlocking
The lock can be unlocked manually at any time via the locking cylinder.
Although a freewheel cylinder is not required, the position of the locking cam
must be no more than 5 mm (30°) in the direction of the faceplate with the
key in the removal position. When using position-adjustable cylinders with
45° indexing, the cylinder cam must be brought into the opposing position
(see fig. 1).
If the locking cylinder is actuated when the motor is running, the lock switches to an overload
protection. In doing so, the lock ignores all incoming control signals for 20 s. The lock also indicates
this event via a red LED in the lower area of the latchbolt hole (see 3.8).
3.4 Motor-driven unlocking
The latchbolt retracts following an impulse (+ 24 V DC) at the control input (pin 9; pink) and returns
to the "latch position" once the programmed hold-open time has elapsed (as-delivered condition 2 s).
If the door is open, the latchbolt remains in the "latch position“ and only moves mechanically to the
"locked position" after engaging in the striker.
The lock can only be securely locked once again after accidental operation of the control signal if
the latchbolt can move into the striker without resistance when the door is closed. If door gasket
pressure is anticipated, a sufficiently sized door closer will be required.
Alternatively, the door can be fully automated using a door drive.
If the lock cannot unlock with the assistance of the motor, e.g. due to excessive load on the door leaf,
it switches to overload protection. In do so, the lock ignores all incoming control signals for 20 s. The
lock also signals this event via a red LED in the lower area of the latchbolt hole (see 3.8).
3.5 Automatic resetting to latch position
If the latchbolt trigger lever is actuated when the door is open, the latchbolt moves mechanically to
the "locked position". It would not be possible to close the door in this case.
Due to the connected door contact, the lock identifies this condition („locked“ with door open). The
lock moves the deadbolt back, without observing a hold-open time, moves it forwards again to the
„latch position“. The door can once again be locked automatically.
In cases where the trigger lever is repeatedly actuated due to manipulation or a malfunction, after
being triggered four times, the latchbolt remains in the "locked position" and the relay contact of the
potential-free function output opens (Pins 11 and 12/green + yellow).
The relay contact is closed again if the control signal is repeated or if the lock is unlocked manually
via the locking cylinder. Actuation via the lever handle will not close the relay contact again.
Fig�1: cylinder cam
In order to prevent unauthorised persons from accessing, the key must
always be removed after unlocking!
When using a knob cylinder, take care that the cylinder cam, once ist has
been unlocked, is returning to its initial position!
An overview on permitted locking cylinders in combination with BKS
escape door locks is available on our website
www�g-u�com/en/services/downloads�html ,
under the „Door technology“ tab for download�
NOTE
(following actuation of the trigger lever with the door open)
