55
7.4 Motor-driven unlocking
The latchbolt is retracted after an impulse (+24 V DC) at the control input (pin 03 pink) and returns
to the “latch position” once the programmed hold-open time has elapsed (as-delivered condition 5 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 the lock cannot unlock with the assistance of the motor within 1 s, e.g. due to excessive load on
the door leaf, it switches to overload protection. The red LED (overload protection) in the lower area
of the latchbolt hole lights up briefly.
7.5 Automatic resetting to latch position
(following actuation of the trigger lever with the door open)
If the latchbolt trigger lever is actuated when the door is open, the latchbolt moves mechanically to
the “locked position”. Closing the door is not possible.
Due to a connected door contact, the lock identifies this condition (locked with door open), moves
the deadbolt back completely then, without observing a hold-open time, moves it forwards again to
the “latch position”. The door can 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”.
7.6 Voltage loss during motor-driven operation
If the power supply fails during motor-driven actuation, the motor stops and the latchbolt remains in
its current position.
In order to use the motor-driven lock on fire and smoke protection doors, it must be connected
to an emergency power supply (emergency power buffer)!
The latchbolt can be moved to the “latch or locked position” at any time via the latch lever operation
of the cylinder.
To ensure that the latchbolt also locks securely when the power supply fails, the lock must be
connected to an emergency power buffer B 5490 0312 or external emergency power supply.
The purpose of the emergency power buffer B 5490 0312 is to lock
once only.
It cannot be used for
permanent motor-driven actuation of the lock.
WARNING
