GAI-Tronics 1090 Installation and user manual - page 13
VR & Help Point
13
The supplementary power input is provided on CON1A as shown and must be
an earth-free isolated supply of 12V dc (250mA min) to suit the power
requirements of the required peripherals, suitable for connection to a TNV-3
circuit.
Note
: A common supply cannot be used for multiple telephones unless the
unit is equipped with an isolated power supply input. This is available as an
option if specifically ordered. Contact GAI-Tronics for details.
CAUTION
: occasional problems have been observed with certain 3rd party
switched-mode power supplies. GAI-Tronics cannot accept responsibility for
the performance of any 3rd party supplied power supply. If in doubt always
use a power supply provided by GAI-Tronics.
6.3. Optional relay outputs
GAI-Tronics hands-free telephones can be equipped with external relay
outputs, controlled by the telephone software. Note – these optional
connections are only available if specifically ordered, and are not field
upgradeable. A supplementary power supply (see section 6.2) is also
required. Contact GAI-Tronics for details.
The additional outputs are provided on HD9 & HD10 as shown and are
isolated SELV outputs as defined by EN 60950-1.
To comply, the installer must ensure that any connections are within SELV limits.
Relay ratings / SELV limits:
30Vdc, 42.4V peak (resistive load)
Max switching current:
3A
A
B
- +
Relay 2
Relay 1
N/C Com N/O