Valcom V-2920 Manual de usuario descargar pdf (Pagina 8)

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The master control may then be used to change the

volume of the entire system. If background music is

being supplied, the background music level should be

adjusted last. To provide volume control to a certain

room or area, V-1092 Wall Mount Volume Controls

may be added to a zone, or to a section of a zone.

SYSTEM OPERATION

Circuit Description

Each Valcom page control unit contains the circuitry

required to interface with a telephone system, plus a

preamplifier circuit, and in some cases dial select

circuitry and/or provisions for background music

switching. Each one-way amplified speaker assembly

contains a speaker, amplifier, and volume control in a

suitable baffle or housing. The speakers and control

units require a -24VDC power supply (-48VDC for

the V-1038) to operate.

Connections from the control unit to the telephone

system are described in detail in the manual that is

shipped with the control unit.

The audio pair from the control unit to the speakers

may be looped (speakers wired in parallel) between

all speakers in a zone (See Table 7). A second pair

must be run to each speaker to supply the DC voltage

required for operation (See Table 11). Standard 22

or 24AWG telephone cable may be used for the

speakers.

When accessing a single zone control unit from the

telephone system, you will immediately be connected

to the speakers and allowed to page.

When accessing a multizone control unit from the

telephone system, you will receive Valcom dial tone

from the Valcom unit. After dialing the code for the

zone desired, you will be connected to that group of

speakers and allowed to page. All Valcom control

units automatically release when you hang up the

telephone.

TECHNICAL ASSISTANCE

Refer to the installation practices for the equipment

being used for troubleshooting information and

procedures.

Assistance in troubleshooting is available

from the factory. Call (540) 427-3900 and ask for

Technical Support, or call (540) 427-6000 for

Valcom 24-hour Automated Support or visit our

website at http://www.valcom.com.

Valcom equipment is not field repairable. Valcom,

Inc. maintains service facilities in Roanoke, VA.

Should repairs be necessary, attach a tag to the unit

clearly stating company name, address, phone

number, contact person, and nature of the problem.

Send the unit to:

Valcom, Inc.

Repair & Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

PROBLEM SOLVERS

Automatic Volume Control

The V-9932 Noise Sensing Volume Control monitors

the noise level fluctuations in an area by utilizing a

built-in microphone. When a page is made, the

V-9932 electronically locks onto the last noise level

sampled and automatically adjust the volume of up to

150 Valcom One-Way Self-Amplified Speakers in

order to compensate for the current ambient noise

level, thus eliminating the need for personnel to

manually adjust the paging speakers. The V-9932

should be mounted in the area that experiences the

fluctuating noise. If a single zone contains areas of

independently fluctuating noise levels, multiple

V-9932 units may be used (one per area).

• Each Noise Sensing Volume Control, V-9932,

can control up to 150 amplified speakers or horns

in a single zone.

• Multiple Noise Sensing Volume Controls,

V-9932, can be used on the same zone if desired.

• V-9932 can be connected to a zone output of any

Valcom One-Way Page Control/Interface or

Station Level Page Control.

• Not for use with background music without

additional equipment.

Digital Feedback Eliminator

The V-9963, Digital Feedback Eliminator, is

designed to prevent paging system feedback. When a

page is made into a zone, the V-9963 records the

page into digital memory. Upon completion of the

live page, the message is released to play over the

zone of speakers. Since the paging party has hung up

the telephone or released the microphone, offensive

feedback cannot occur.

• Each Digital Feedback Eliminator, V-9963, can

control up to 150 amplified speakers or horns in

a single zone.

• Multiple Digital Feedback Eliminators, V-9963,

can be used on multiple zone page controls.

• The V-9963 can be connected to a zone output of

any Valcom One-Way Page Control/Interface or

Station Level Page Control.

• Not for use with background music without

additional equipment.

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