Valcom V-2920 Manual de usuario descargar pdf (Pagina 9)

9 947100

ENHANCEMENT TO EXISTING

25/70/100 VOLT PAGING

SYSTEMS

Using a Valcom Page

Control/Interface with a Central

Amplifier

Typically a zone from a one-way control unit may be

directly connected to a high power amplifier to allow

access to existing paging equipment. In certain cases

capacitors or a resistor network may be required to

interface the Valcom equipment to the amplifier.

Contact Valcom Technical Support if trouble is

encountered.

NOTE: Not all Valcom page control units have

control leads available for amplifier control.

Use Valcom One-Way Self-Amplified Speakers to

expand a 25/70/100V audio zone.

It is cost effective to expand a centrally amplified

paging system with Valcom distributed amplified

speakers. In many instances expanding a centrally

amplified paging system involves replacement of the

expensive central amplifier with a larger one in order

to provide the additional power that the speakers or

horns require.

This also involves additional labor in re-balancing the

system. Adding high voltage type speakers to an

existing amplifier where the load is not configured

properly will cause distortion or premature system

failure, again requiring replacement of the central

amplifier. By using Valcom distributed amplified

speakers to expand the system, almost unlimited

growth is possible, without loading down the existing

amplifier.

Add or use existing 70V

transformer tapped at 1/4 or

8 ohm

-24VDC

Valcom

Power

Supply

One-Way

Amplified

Speakers

(up to 150)

Gnd

-24VDC

Tip

Ring

Inexpensive regular

twisted pair telephone

wire

70 Volt Speakers

V-1094A

FIGURE 2

1/4 watt

common

Volt

Amp

Using Valcom One-Way Amplified Speakers

To Expand an Existing 70 Volt Paging System

ADVANTAGES OF DISTRIBUTED AMPLIFIED SYSTEMS

• Low voltage, therefore existing telephone cable (Class 2 wiring) can be used to eliminate costly outside plant or

indoor conduit.

• Low voltage operation means much less power dissipation (heat), therefore the longevity of the paging

equipment is increased dramatically.

• Multizone capability of thirty-six (36) zones from a single trunk port. [Need more than 36 zones? Call and ask

for Technical Support.]

• Talkback, one-way or combination systems are easy to configure.

• Individual volume controls in each one-way speaker make for easy and fast adjustment after the system is

installed.

• It is cost-effective to install one telephone cable versus installing both telephone cable and 70 volt shielded

paging cable.

• Unlimited one-way speaker expansion since each speaker is self-amplified.

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