PROTECH
MODELS COVERED
902
®
INTEGRA III SYSTEM
1/05
MODEL 902
PRIORITY PAGING SWITCHER CARD
INSTALLATION & OPERATION MANUAL
www.protechaudio.com
The Model 902 Priority Paging Switcher Card is designed
for use in professional audio applications. Each unit features six (6) paging inputs, one (1) line level output, and a
switch closure circuit for control of priority bypass relays,
or other paging functions.
Typical applications are public address systems in buildings such as airports, factories, hospitals, courthouses,
casinos, convention centers, libraries, hotels, racetracks,
and office buildings.
The mechanical construction of the Model 902 allows
mounting of up to ten (10) units in a Model 857B Card
Frame, or 9 units in a Model 858B Card Frame. Each
Model 902 card unplugs from the front of the card frame,
without the need for removing any wires from the rear
of the card frame. Spare units may be placed into service in
a matter of minutes.
Each Model 902 has six inputs, which are arranged in
a series configuration. Each input passes thru a number of
double-pole double-throw relays. Activating any higher
priority relay disconnects the relay chain at the selected
point, and allows the higher priority input channel to pass
thru to the output stage. Input stage number 6 is normally
used for background music, and is configured in the normally ON position. Activating any of the other five (5)
inputs will disconnect input number 6.
Model 902 Shown
The Model 902 Priority Paging Switcher Card is balanced
at both the input and output stages. The output level may be
adjusted by using the on-board output level control trimpot.
The relay control circuits are activated by grounding the individual control pins as indicated on the block diagram on page 3
of this manual. In addition to the paging input controls, grounding any of the control pins will activate the priority bypass relay
control circuit. This circuit is usually used to activate bypass
relays in remote level attenuators. However, it may be wired to
any control circuit requiring no more than 1 amp of current at
24VDC.
All integrated circuits used in the Model 902 are mounted in
plug-in IC sockets, to facilitate maintenance of the system.The
DC power supply connections are protected by self-resetting
electronic fuses. If a card should malfunction, the electronic
fuses will disconnect the card from the power supply. The
same type of fusing is provided in the priority bypass relay
control circuit.
Other INTEGRA III SYSTEM cards, such as distribution
amplifiers or compressors, may be used in the same card frame
assembly, to allow construction of complete audio systems.
Each of these products is designed to provide the user
with high quality audio, for years of uninterrupted
service.
Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395
INSTALLATION
The Model 902 Priority Paging Switcher Card is designed to be
mounted in the Model 857B Card Frame, or the Model 858B
Card Frame.
The Model 857B Card Frame will accomodate up to 10 audio
cards, and requires an external power supply (Model 66708).
The Model 858B Card Frame will accomodate up to 9 audio
cards (depending upon AC current requirements), and has a
built-in, unpluggable power supply card.
All card frame assemblies bus the DC power to the individual
card slots, and provide screw-type barrier termination points for
audio and DC connections.
The determination as to which backplane assembly to use in
your project, was made prior to our factory receiving the
order. The backplane assembly you have received will
accommodate the group of cards you or your designer have
specified.
The actual steps necessary for installation of the
INTEGRA III SYSTEM Priority Paging Switcher Cards, are
comparable to those necessary for any of the system cards.
They are as follows:
1 - Mount the card frame in an appropriate EIA 19" width
rack, using 4 screws of sufficient tensile strength to provide
secure mounting.
2 - A determination has been made as to which type of power
supply will be used on your system. Follow the instructions
for the type of power supply you will be installing.
4- Unpack each individual card, inspect for shipping
damage, and assuming none is found, slide the card
half-way into the appropriate slot. After all cards have
been installed half-way into the card frame, plug in one card
at a time and turn on the power supply. Make sure no unusual
loading is noticed at the power supply. If loading is noticed,
unplug the card and recheck terminations. If no loading is
noticed, continue inserting each card in the card frame, checking
power supply loading as each card is plugged in. When all the
cards have been plugged in, the installation is complete, and
all that remains is the alignment.
ALIGNMENT
Each Model 902 Priority Paging Switcher Card with has been
shipped from the factory aligned for unity gain. If gain
adjustment is required, the following procedure is recommended:
1-
Remove the Model 902 card from the card slot, and
place a Model 516 extender card in the slot.
2-
Place the Model 902 into the mating connector on
the model 516 extender card.
3-
Actuate any on the 5 paging channel input relays,
apply a signal representative of the page input level
to the selected channel, and adjust the output level
by turning the output level control trimpot.
PROTECH
857B & 858B Backplane Connections
Input #6 HI
Input #6 LO
Relay Bypass ARM
Relay Bypass N/O
Relay Bypass N/C
®
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INTEGRA III SYSTEM
CONNECTOR DRAWING
Priority Paging Switcher Card
Model 902
Input #4 LO
Input #4 HI
Ground
Input #5 HI
Input #5 LO
Input #3 HI
Input #3 LO
Ground
Input #2 HI
Input #2 LO
Input #1 HI
Ground
Output Hi
Output Lo
EXTERNAL POWER SUPPLY. If an external power
supply is to be used, terminate the proper supply
connections to pins 1, 2, & 3 of the 3 pin barrier connector, as
shown in the card frame layout drawing. Turn on the power
supply, and using a DC voltmeter, check for correct voltage
and polarity at pins 1, 2, & 3 of the 3 pin barrier connector.
INTERNAL POWER SUPPLY. If a plug-in power supply
card is to be used, plug in the supply card, and check for proper
illumination of both DC voltage green LED's.
3 - Terminate all audio input and output connections, using
the card connection drawing on the facing page. Double
conductor shielded cable is recommended for all audio
connections.
4-
Remove the Model 902 from the Model 516 Extender
card, remove the extender card from the card slot, and
place the Model 902 into the card slot, making sure it is
seated properly.
This completes the installation and alignment of your
INTEGRA III SYSTEM Priority Paging Switcher Card. The
cards may be expected to deliver year of uninterrupted service.
Page 2
PAGE OUTPUT
LEVEL CONTROL
HIGHER
MODEL 902
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