Extron Electronics PPC 25 Installation - Manual (Page 2)

PPC 25 Priority Page Sensor • Installation Instructions 2
PPC 25 Installation Instructions, cont’d
Front and Rear Views of the PPC 25 Controller
a
Power-on LED — green when power is on.
b
Relay LED — amber when output relay is closed.
c
Power receptacle — 12 VDC, 33 mA. The unit does not ship with a power
supply. Power may be shared with another device. Polarity must be observed.
N When using the PPC 25 controller with a PoleVault switcher, use the
Y-shaped power cable (provided) to power both units (see page 3).
d
Paging Sensor connector — for the Priority Page Sensor that is located near a
PA system speaker.
e
Relay Out connector — connects to an amplifier or switcher 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).
f
Time switch — sets how long the output relay will remain closed after a PA announcement has ended. A 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:
g
Sensitivity adjustment — sets the sensitivity level for the signal arriving from the Priority Page Sensor. The final
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.
PPC 25
RELAY
7
2
3 4 5 6
1
POWER
C NO
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