Extron electronic PPC-25 User Manual

PPC 25 Installation Instructions

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Ceiling Mounted
Paging Speaker

Paging System

PPC 25

Priority
Page
Sensor

ClassroomAdmin Building

To Classroom
Paging Speakers

Relay Output

Remote
Vol/Mute
Control

Extron
PPC 25

Priority Page
Controller

Extron
PVS 204SA

Twisted Pair
Switcher

Extron
SI 26

Surface Mount
Speakers

PPC 25

RELAY

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2

3 4 5 6

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POWER

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PAGING

SENSOR

OUT

TIME

RELAY

SENSITIVITY

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= 2.0 sec (default) = 4.0 sec= 6.0 sec= 8.0 sec

PPC 25 Overview

The PPC 25 consists of the Priority Page
Controller and Priority Page Sensor.
Together they mute classroom audio for
the duration of an announcement that is
made over a Public Address (PA) system.

The Sensor connects to a PA speaker
lead and detects current flow when a
PA announcement is initiated.

The Sensor signal triggers the PPC 25
controller’s output relay to close. This
relay closure can connect to a PoleVault™
switcher, a Mini Power Amplifier (MPA),
a MediaLink™ Controller (MLC), or any
device with a contact closure type of
mute control or a configurable digital
input.

The output relay remains closed until the PA
announcement ends. It then opens, dropping
the mute signal and restoring the classroom audio.

For a PoleVault System, the output relay should connect only to the PVS 204SA and not the MLC. This requires no
software configuration.

If the Output Relay is connected to an MLC digital input, use Global Configurator software to configure the input
port, and set the monitoring conditions and actions to drive the desired mute function on the classroom audio device.

The PPC 25 Controller and Sensor are rated for use in plenum environments (any area utilized for air handling,
including areas above suspended ceilings and below raised floors). The PPC 25 Sensor assembly must be installed
in a UL-compliant junction box with a cover to meet the plenum rating requirement.

A Typical PPC 25 Installation

The PPC 25 works with traditional 25V or 70V and 4/8 ohm PA systems. It was not designed

for, and may not work properly with, systems using digital clocks and two-way intercoms.

Front and Rear Views of the PPC 25 Controller

Power-on LED — green when power is on

a

RELAY LED — amber when output relay is closed

b

POWER receptacle — 12 VDC, 33 mA. The unit does not ship

c

with a power supply. Power may be shared with another device.
Polarity must be observed.

PAGING SENSOR connector — for the Priority Page Sensor that

d

is located near a PA system speaker

RELAY OUT connector — connects to an amplifier or switcher

e

that has a contact closure type of mute control input, or to an MLC
device with a digital input. When a PA system announcement is
initiated, the output relay closes and remains closed for the duration of the announcement. The closed output
relay triggers the classroom audio mute function. When integrating the PPC 25 into a PoleVault System,
connect the output relay to the PVS 204SA Mute and Ground pins only (see diagram on page 2).

TIME switch — sets how long the output relay will remain closed after a PA announcement has ended. A

f

short time delay is necessary so that if the PA system announcer pauses briefly during the announcement, the
classroom audio is not restored prematurely. The 2-position DIP switch provides the following time settings:

SENSITIVITY adjustment — sets the sensitivity level for the signal arriving from the Priority

g

Page Sensor. The final setting depends on the type of paging system and the number of wire
loops on the Sensor (see page 2). Rotate clockwise to increase sensitivity and counterclockwise
to decrease sensitivity.

PPC 25 Priority Page Sensor • Installation Instructions

68-1437-01

Rev F

04 08

1

PPC 25 Installation Instructions, cont’d

Extron Electronics, USA

1230 South Lewis Street
Anaheim, CA 92805

800.633.9876 714.491.1500
FAX [phone]

Extron Electronics, Europe

Beeldschermweg 6C
3821 AH Amersfoort, The Netherlands
+800.3987.6673 +31.33.453.4040
FAX [phone]

Extron Electronics, Japan

Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
+81.3.3511.7655 FAX [phone]

Extron Electronics, Asia

135 Joo Seng Rd. #04-01
PM Industrial Bldg., Singapore 368363
+800.7339.8766 +65.6383.4400
FAX [phone]

www.extron.com

Ceiling Mounted
Paging Speaker

Priority
Page
Sensor

From
PA system

To Priority
Page Controller

Blue
Sensor
Cable

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To Power Supply

Extron
PPC 25

Priority Page
Controller

Extron
PVS 204SA

Tw isted Pair
Switcher

Extron
PVS 204SA

Rear Panel

LR

RS-232 MLC/IR

DC VOL

4/8

Ohms

AMPLIFIED OUTPUTS

VOL/MUTE

Tx

ABC

Rx IR 12V

10V

Mute (center)

Ground (right)

Installation Procedure

Follow all local fire and safety code requirements for installation and anchoring. Install the PPC 25

Sensor in a UL-compliant junction box with a cover to meet plenum rating requirements.

1. Open the top of the Priority Page Sensor.

2. Loop either one of the speaker wire leads around the top (open) part of the Sensor, and connect it to the speaker

as shown above. Connect the other speaker wire directly to the speaker. Polarity need not be observed.

• Fora25V or 70V system — wrap 5 to 8 loops.

• Fora4/8 ohm system — wrap 2 to 4 loops.

3. Close and latch the top of the Priority Page Sensor.

4. Cut an 18" section from the unterminated end of the supplied

blue sensor cable for use in step 8 below.

5. Strip 3/16” of insulation from each conductor on the bare wire
end of the blue sensor cable. Do not tin the leads.

6. Connect the stripped leads to the 2-pole captive screw connector
on the Priority Page Sensor. Polarity need not be observed.

7. Route the connector end to the PPC 25 Controller, and plug it into the PAGING SENSOR receptacle.

8. Connect the 18” 2-conductor cable (from step 4) from the RELAY OUT port on the PPC 25 Controller to the mute

control input port on the audio amp or switcher to be muted during a PA system announcement. Polarity need
not be observed.

When integrating the PPC 25 into a PoleVault System:

1. Connect the 18” cable (from step 4 above) from the RELAY OUT

port on the PPC 25 Controller to the MUTE and GROUND pins
on the PoleVault PVS 204SA VOL/MUTE port. Polarity need not

be observed.

2. Use the included cable assembly (PN 27-576-01LF) to power the
PPC 25 from the PVS 204SA power supply. The PPC 25 must be
mounted near the PVS 204SA and its power supply.

Testing and Adjustment Procedure

To test that the classroom audio is muted when a
PA system announcment (page) occurs:

1. Turn the classroom audio on.

2. Speak into the PA system microphone. The classroom

audio should be muted while the PA system page occurs, and be restored when the page ends.

3. If the PPC 25 fails to mute the classroom audio during a page, turn the SENSITIVITY adjustment clockwise.

4. If classroom audio is muted without a page occurring, turn the SENSITIVITY adjustment counterclockwise.

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PPC 25 Priority Page Sensor • Installation Instructions