2N Door intercom 2N Helios - Manual, 1322 v3.0 - Manual (Page 32)

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Separate Backlight and Electric Lock Supply
Separate power supplies are necessary where the lock requires voltage higher than 12
V. In this case, an additional power supply (12V) must be used to illuminate the
button backlight - see the figure below. Other reasons for such connection are the
effort to minimise consumption from the back-up supply (which supplies the lock, not
the backlight), or just that two weaker power supplies are available
Lock and Backlight Connection
Connection of Switch 2
A new additional switch, Part No. 9135250E, has been designed for 2N® Helios. It
can be mounted into any basic unit, as an added option. To connect it, follow the
instructions included in the switch delivery.
El. lock
Supply AC
or DC
max.48V
Supply AC
or DC
max.12 V
tel.
line