Valcom v-2920 Service Manual

VSP-V-2920

Issue 6

V-2920

ADVANCED 20 ZONE TALKBACK INTERCOM SYSTEM

INTRODUCTION

The V-2920, Advanced 20 Zone Talkback Intercom
System, is a communications system which provides
voice paging with hand sfree reply for up to 20 zones.
The V-2920 is for use with any electronic or 1A2 key
system, or PABX loop start trunk port.

These instructions contain the specifications and
information necessary to install, operate, and maintain
the Advanced 20 Zone Talkback Intercom System.

"WARNING: To reduce the risk of fire or electric
shock, do not expose this appliance to rain or
moisture."

"WARNING: Shock Hazard - Do Not Open."
"AVIS: Risqué de Choc Electrique ne pas Ouvrir."
"PELIGRO: Corriente Electrica - No Abres."

SPECIFICATIONS

Purpose

The V-2920 provides 20 zones of paging with
handsfree reply. The system also provides the ability
for a remote speaker location equipped with a call
button to call the attendant location.

Components

The V-2920 system consists of three components: A
V-2920 Control, a V-2990 Ring Down Device, and a
VP-324 Power Supply.

Access

• PABX Loop Start Trunk Port

• E-Key C.O. line position

• 1A2 Key line position equipped with line card

• Dedicated single line phone

Features

• 20 zones of handsfree communication

• Built-in handsfree amplifier

• Background music input

• Built-in all call with "meet me" capability

• "Ring in" from speaker locations

• Calls placed in queue

• Override capability from speaker locations

• Dial tone (optional)

• Alert/ringback tone (optional)

• Repeated alert tone (optional)

• Auxiliary contact closures for zones 26, 27, 28,

29

• Lamp contact closure

• Ring contact closure

• Inhibit input

• Control unit is battery backup compatible

Capacity

• The capacity of the V-2920 is 20 zones plus all

call.

• The V-2920 is a single talkpath unit.

• The maximum number of speakers per zone are

two, 45 Ohm speakers and 40 one-way amplified
speakers.

Refer to Figure 1 for a block diagram of a typical
installation.

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PABX,
ELECTRO N IC
OR 1A2 KEY
SYSTEM OR
DEDICATED
SING LE LINE
TELEPHO NE

V-2990
R IN G
DOW N
DEVICE

V -2 9 2 0
CONTROL
U N IT

FIG U R E 1

SIM PLIFIED BLO C K DIAG R A M O F A TYPICA L IN STA LLA TIO N

4 5 O H M
TALKB ACK
SPEAKER

CALL BUTTON

(U P T O 2 0 Z O N E S )

Dimensions/Weight

• Control Unit - 8.55" H x 11.0" W x 2.35" D

(21.72cm H x 27.94cm W x 5.97cm D)

• 6.7 lbs. (3.04 kg)

• Ring Down Device – 8.2”H x 4.55”W x 2.3”D

(20.83cm H x 11.56cm W x 5.84cm D)

• 1.25 lbs. (.57 kg)

• Power Supply – 3.0”H x 2.5”W x 2.0”D

(7.62cm H x 6.35cm W x 5.08cm D)

• 0.8 lbs. (.36 kg)

Nominal Specifications

V-2920 - Control Unit

• Input Impedance: 600 Ohms

• Input Level: -10 dBm

• Output Impedance: 45 Ohms

• Aux/Music Input: 8-600 Ohm low level

V-2990 - Ring Down Device

• Input Impedance: 600 Ohms

• Output Voltage: 90 Vac ring ge nerator

VP-324 - Power Supply

• - Output: 24 Vdc +/- 3 V "B" Battery

(Unfiltered Signal Battery)

Numbering Plan

• The dialing codes are 10 to 29 and 0 for all call.

Auxiliary Contacts

The V-2920 is equipped with 6 sets of auxiliary
contact closures. They are:

Lamp Contact Operates on loop closure.
Ring Contact Follows ringing cycle 2

seconds "ON", 4 seconds
"OFF".

Zone 26 Contact Operates when station 26 is dialed

and the "*" key is pressed.

Zone 27 Contact Operates when station 27 is dialed

and the "*" key is pressed.

Zone 28 Contact Operates when station 28 is dialed

and the "*" key is pressed.

Zone 29 Contact Operates when station 29 is dialed

and the "*" key is pressed.

Volume Controls

The V-2920 is equipped with 5 volume controls.

• Phone to Speaker - Adjusts the transmit volume.

• Speaker to Phone - Adjusts the receive volume.

• Music 1 adjusts background music for zones

10-19.

• Music 2 adjusts background music for zones

20-29.

• All Call adjusts the one-way all call level.

Power Requirements

V-2920 - Control Unit

Voltage: 115 Vac
Power: 30 Watts

V-2990 - Ring Down Device

Power: -21.5 to -26.0 Vdc, 200 mA

VP-324 - Power Supply

Input: 105-120 Vac, 60 Hz, 18 watts

Environment

• Temperature: 0 to 40 Degrees C

• Humidity: 0 to 85% non-precipitating

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DESIGN

General

The V-2920, Advanced 20 Zone Talkback Intercom
System used with the Valcom talkback speakers,
provides voice paging with handsfree reply for up to
20 zones.

INSTALLATION

Precautionary Designations

RISK O F E LE CTRIC S HO C K

The system can be accessed through a C. O. line
position of a key system, loop start trunk port or
single line telephone. Zones are selected by dialing a
two digit number. The user can then page the area
and anyone hearing the page can reply back
handsfree. (By using one-way amplified speakers, a
zone can be one-way).

The system can also be accessed from a talkback
speaker location. When a call button at the speaker is
pressed, the ded i c ated line or trunk port will begin to
ring. A person hearing the incoming ring accesses the
line or trunk. The person at the telephone can then
talk with the person at the speaker location. (Valcom
doorplate speakers are normally used in these
applications).

When the system is in use and another call is placed
from a speaker location, the person on the telephone
will hear 3 short tones and the call will be placed in
queue. If the # key is pressed, the telephone user will
be connected to the new calling location. The system
will remember the order that calls come in and will
switch to the next call in queue when the # is pressed.
A person can override a call in progress by pressing
the call button four (4) times within a four (4) second
time period. The person at the telephone will be
connected to the zone that originated the override and
the call in progress will be placed in queue.

Zones 26 to 29 can be in the normal queue or be
programmed to have a lower priority than the rest of
the zones. In the lower priority mode, the zones can
be used for door locations or other areas not requiring
immediate response from the attendant. These zones
will be bumped from their place in queue and put at
the end of the line if another zone calls in. There are
also contact closures associated with zone 26-29.
The contact closures can be operated by pressing the
"*" key on the telephone key pad after the zone has
been called. These contacts can be used to operate
electric strike plates on doors.

The V-2920 provides a background music input, and
is designed to automatically cut off the music during a
page. If background music is to be installed, a low
level music source such as the V-2952 FM Tuner will
be required.

CAU TIO N: To reduce the risk of electric s hoc k,

D o n o t rem ove c over .

No user serviceable parts inside.

Refer servicing to qualified s ervice personnel.

This sy m bol indicates that dangerous
voltage constituting a ris k of electric
shoc k is present within this unit.

This sy m bol indicates that there are
important operating and m aintenance
instructions in the literature accom pany ing
this u nit .

Cabling

Two 25 pair cables with female connectors should be
run from the Control Unit (V-2920) to each of the
connecting blocks. The cables should be terminated
on the connecting blocks in standard color code
color. An opening is provided at the bottom of the
Control Unit to allow exit of the cables. A "punch
out" slot is designated at the top of this opening to be
"punched out" to allow additional cabling exit space,
if required.

Mounting

The V-2920 System was designed to be wall or table
mounted. When wall mounting the V-2920 System,
secure the units to wall studs or a suitable brace. (A
plywood backboard 2' square and at least 1/2" thick
attached to wall studs would be considered a suitable
brace). Make certain the units are not mounted near
heat sources or strong magnetic fields. Ascertain
control and terminal strip accessibility.

Six 3/4" cross-tip round head wood screws are
included for mounting the V-2920 and V-2990.
Fasten two of these screws at the appropriate location
on the mounting surface, allowing the screwheads to
protrude 1/8" to 1/4". Place the chassis of the
Control Unit (V-2920) onto the screwheads at the
mounting slots. Position two screws through the
remaining mounting slots and fasten. Complete
mounting the Control Unit by tightening all screws.
Using the two screws remaining, mount the Ring
Down Device (V-2990) in a similar manner.

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