GAI-Tronics 1090 Installation And User Manual - Page 10
Browse online or download pdf Installation And User Manual for Telephone GAI-Tronics 1090. GAI-Tronics 1090 20 pages. Hands-free telephones vandal resistant (vr) and help point
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6.
Connections
6.1. Standard Connections
Connect the telephone line A and B to the main terminal block CON1 as
shown.
The centre earth terminal is intended as an optional connection to a local
earth for the purpose of enhanced protection from lightning transients, and is
not required in terms of user safety from the telephone network.
Note: Conductor sizes to be 0.5mm-2.5mm
(solid cable) The terminal block can be disconnected from the circuit board
for easier installation
Cabling must not infringe European Low Voltage Directive (LVD) 73/23/EEC.
6.2. Supplementary Power supply
GAI-Tronics hands-free telephones can be equipped with a supplementary
power supply, required to power the induction loop (if fitted), external relays (if
fitted) and generally to provide increased audio output level.
The standard telephone does not require this supplementary supply for
normal operation, but note that ringing on exchanges with low ring voltages
(<40Vac) may be unreliable without a supplementary supply.
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.
10
A
B
2
(flexible cable); 0.5-4.0mm
- +
A
B
2
VR & Help Point