GAI-Tronics 1090 설치 및 사용자 설명서 - 페이지 10

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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.

(flexible cable); 0.5-4.0mm

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VR & Help Point