User guide
Doortello Business
Issue 1.00
Page 11
The external DC power supply must have a voltage range form 8 to max. 12 Vdc
stabilized. We suggest you the use of the our power supply unit PRS 231S or the
DB RU 1 unit (see also chapter
Options
).
The external power supply is also used to power the LED illumination of the door
station modules. Using the DC input on the door phone only 12 modules can be
powered over the DB bus. If more modules are installed a separate power supply
has to be used. In this case the door station modules have the jumper which is
used to separate the power line between the modules. For the power supply of
the modules you can find a screw connector on each unit. For more information
please read the specific documentation of the single modules.
Please note!
With installations at sites with extreme weather conditions, as well with wall
mounted and pedestals installations we suggest in any case the power supply
of the door phone to activate the integrated heater element.
Please note!
The external power supply MUST be stabilized. The voltage MUST NOT exceed
12 Vdc. Higher voltage will destroy the unit!
Please note!
If you are installing more door phone on the same site a separate power
supply unit has to be used for each door phone. Connecting more door
phone with the same power supply unit may damage the devices and will
short circuit the telephone lines!
Please note!
The door station modules can be powered also with 12 Vac. Please ensure
that the voltage used does not exceed 13,8 Vpp. A higher voltage may
destroy the modules. If using an external voltage to power the modules
PLEASE ENSURE THAT THE SEPARATION JUMPER IS OFF ON THE FIRST MODULE.
If not applying the external voltage to the modules WILL DESTROY the door
phone!
Power supply over the telephone line
The Doortello Business door phone has been designed to work as well using the
telephone line only. In this case the device is powered by the telephone line itself.
Using the telephone line only the door opener and the modules LED illumination
are to powered separately. In this case only a AC power supply is needed as the
module can power the LED also using a transformer only. Please refer to the
specific user guides for more information.
Please note!
For specific functions, like the dial of a flash signal, the telephone line has to
be interrupted for a short time. To ensure that the processor inside the device
are still powered during this time, if only a power supply over the telephone