Extron Electronics PPC 25 User Manual

PPC 25 Installation Instructions

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Ceiling Mounted
Paging Speaker

Paging System

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 Overview

The Extron PPC 25 Sensor and Controller 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.

A signal from the sensor 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, muting the classroom audio, until the PA announcement ends. It then opens, dropping the
mute signal and restoring the classroom audio.

If the output relay is connected to a MediaLink controller 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.
For instructions, consult the MLC’s user’s guide.

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

Included Parts:

Priority Page Controller•

Priority Page Sensor•

UL-compliant junction box with a cable clamp and a lid•

35’ (10.7 m) of sensor cable•

Y-cable for sharing power with another unit•

The PPC 25 Sensor assembly must be installed in a UL-compliant junction box with a cover to meet
the plenum rating requirement. All cables to and from the sensor must also be plenum rated.

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The PPC 25 works with traditional 25 V or 70 V and 4/8 ohm PA systems. It is not designed for, and may not work

properly with, two-way intercoms, or systems that are IP-based or use digital clocks.

PPC 25 Priority Page Sensor • Installation Instructions

A Typical PPC 25 Installation

68-1437-01

Rev G

12 08

1

PPC 25 Installation Instructions, cont’d

PPC 25

RELAY

7

2

3 4 5 6

1

POWER

CNO

PAGING

SENSOR

OUT

TIME

RELAY

SENSITIVITY

12V

0.5A MAX

ON

1

2

TIME

ON

1

2

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

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 with a power

c

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

N

Paging Sensor connector — for the Priority Page Sensor that is located near a

d

PA system speaker.

Relay Out connector — connects to an amplifier or switcher that has a contact closure type of mute control input,

e

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 short time

f

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:

When using the PPC 25 controller with a PoleVault switcher, use the

Y-shaped power cable (provided) to power both units (see page 3).

Sensitivity adjustment — sets the sensitivity level for the signal arriving from the Priority Page Sensor. The final

g

setting depends on the type of paging system and the number of wire loops on the sensor (see page 3). Rotate
clockwise to increase sensitivity and counterclockwise to decrease sensitivity.

Installation Procedure

W

All structural steps and electrical installation should be

performed by qualified personnel in accordance with local and
national building codes, fire and safety codes, and/or local and
national electrical codes.

To meet the plenum rating requirement the PPC 25 Sensor
assembly must be installed in a UL-compliant junction box with
a cover and all cables to and from the sensor must be plenum
rated.

1. Choose suitable locations for the controller and sensor. The controller must

be located close to the PVS 204SA and its power supply. The sensor must be
located near, and in series with, the speaker.

2. If the sensor is to be located in a plenum space, the junction box (provided)

can be used. Knock out an opening at one end of the junction box and
attach the cable clamp (see figure at right). Secure the box where the
sensor will go.

3. Disconnect the speaker cable from the speaker.

2

PPC 25 Priority Page Sensor • Installation Instructions