Connection To Telephone Line; External Power Supply And Electric Lock Connection - 2N Helios Uni Installation Manual

Compatibility
2N® Helios Uni is designed for conventional, analogue telephone lines and works
regardless of polarity and line parameters.(Refer to the Technical Parameters) and
uses tone (DTMF) or pulse dialling to be programmed. Normally, it is connected to a
PBX line however It can also be connected to an analogue line or the GSM interface
providing a wireless installation.

Connection to Telephone Line

Connect 2N® Helios Uni simply using LINE terminals. The advantage is that 2N®
Helios Uni requires no power supply because all power is fed from the telephone line
– except for the button backlight and electric lock, if connected. Nevertheless, 2N®
Helios Uni can work without these circuits too and sends an acoustic signal on having
been connected to a line (or after having been disconnected from the line for a defined
period of time).

External power Supply and Electric Lock Connection

®
2N Helios Uni requires 12V supply for:
1. Name tag backlight – current draw of up to 5 mA, AC or DC
2. Electric lock – current draw according to the lock type*)
3. Additional amplifier if available – current draw of up to 100 mA, DC only!
*) The electric lock can be fed from the same source as the intercom or another
supply.
®
2N Helios Uni 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.
Danger!
Never switch 230 or 120 V mains voltage directly!!!

Caution
If the lock power supply fails and the telephone system carries on

working, the intercom 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.
Ground connection is mandatory. If used power supply output is

grounded, you can connect GND terminal to it.
Electric Installation 1.3