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EN
Functions and meaning
Fail-unlocked and fail-locked in the event of an emergency
The
electric security lock 809M
is available in “fail-unlocked” and “fail-locked” product versions.
In the fail-locked version the outer handle is deactivated when no electrical current flows. Therefore in
normal operating mode no current flows permanently.
In the fail-unlocked version the outer handle is deactivated when electrical current flows. Therefore in
normal operating mode current flows permanently. The current is disconnected for passage through the
door from the outside.
In the fail-unlocked product version one door can also be passed through from outside if the power fails
and therefore free accessibility is enabled for the fire brigade and rescue services in the event of an
emergency.
Application examples
The following examples clarify the possibilities of the
electric security lock 809M
in combination with the
superordinate control systems.
Alarm if the door remains open
The bolt contact of the
electric security lock 809M
reports “door closed and locked” to the superordinate
system. If a door remains open for a longer time, an alarm is triggered after the lapse a time period defined
in the control system.
To help prevent false alarms, an additional door contact can be connected in a series so that the door
contact indicates the closed door and the lock in addition to the locking. If one of the contacts is not
closed again, an alarm is triggered after the lapse a time period defined in the control system.
The combination of an additional door contact with a bolt contact of the electric lock also prevents
manipulation of the door.
No alarm if the door is opened from inside
Door monitoring which already triggers an alarm if the door is opened without prior activation by an EAC
system cannot differentiate whether the door was opened from inside or outside. In this case the alarm
can be suppressed by the inner handle contact connected in a series.
Estimating the number of persons
With the inner door handle and outer door handle contacts, a differentiation can be made as to the
direction in which a person passes through the door. In this manner a superordinate system can count the
movements and estimate the number of persons inside. An exact determination of the number is not
possible in this manner, because it is possible that multiple persons pass through an open door at the
same time.
Fail-locked
Fail-unlocked
If the power fails in an
emergency situation
Bolt contact
Inner handle contact
Inner door handle and
outer handle contact
