G-U BKS SECURY 21 EK Serie Instrucciones De Montaje página 35

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2.3.1.1 Open-circuit principle (fail-secure)
Without operating voltage, the outside lever handle is decoupled (open-
circuit principle).
By applying operating voltage (e.g. via a switch), the outside lever handle
can be coupled.
Alternatively, it is always possible to couple the outside lever handle
through the built-in locking cylinder (key).
The following lock functions are available as potential-free contacts:
 
Position of the cylinder cam / key (initial position or actuated)
 
Outside lever handle (actuated or not actuated)
 
Inside lever handle (actuated or not actuated)
2.3.1.2 Closed-circuit principle (fail-safe)
Without operating voltage, the outside lever handle is coupled (closed-
circuit principle).
By applying operating voltage (e.g. via a switch), the outside lever handle
can be decoupled.
Alternatively, it is always possible to couple the outside lever handle
through the built-in locking cylinder (key).
The following lock functions are available as potential-free contacts:
 
Position of the cylinder cam / key (initial position or actuated)
 
Outside lever handle (actuated or not actuated)
 
Inside lever handle (actuated or not actuated)
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