2N Door intercom 2N Helios - Manual, 1322 v3.0 - Manual (Page 29)

29
Typical Electric Lock Connection
2N® Helios contains a solid-state switch equipped with V-MOS transistors, which is
able to switch both ac and dc regardless of polarity. Make sure that the current and
voltage values do not exceed limits (refer to the Technical Data) and that the technical
parameters of the lock and power supply are compatible.
Fig.: Lock Connection
Varování
 Never switch 230 or 120 V mains voltage directly!!!
If you do not have an electric lock and want to have one, you should select a 12
V lock, this being the most common type. Connect the lock according to the figure,
which shows the button backlight supply too (see later).
Dc-supplied lock: Practically all locks can be dc and ac supplied. The ac supply is more
advantageous because the lock buzzes, which is the clearest signalling method
however to use a dc supply lock (from batteries, e.g.), you are recommended to equip
2N® Helios with acoustic signalling (continuous tone during the whole switch
activation time).
Caution
 If the lock power supply fails and the telephone system carries on
working, the keypad-equipped 2N® Helios system is unaware of the
failure the switch will be password-activated and the activation is
acoustically signalled, but the electric lock will not work because of the
lack of power.
Electric
door
lock
Power
supply 12V
AC or DC
Tel.
line