Crown CTs 2000 Operation Manual page 34

twelve screws, four on the front panel, four on the
rear panel and four securing the top to the sides. The
front panel switches are designated as PRESET 1
through PRESET 8.
The Model AR2000-Z is assembled in a black,
sprayed aluminum 3-piece housing approximately
17.5" wide by 10.125" deep by 1.75" high. It is in-
tended to be rack mounted in a standard 19" rack
mount cabinet. The housing is held together with
twelve screws, four on the front panel, four on the
rear panel and four securing the top to the sides. The
front panel switches are designated as ZONE 1
through ZONE 8.
1-3. CONTROL CIRCUITRY.
A. Control Circuitry.
The control circuitry in the AR2000-M has a
built-in priority level feature. The local microphone
has the highest priority level when activated. If a
preset is initiated by contact closure, the AR2000-M
will grant that preset priority. The Audio Router will
store the current selection first, then activate the
preset. Once the contact closure is removed, the
AR2000-M will return the system to the previous
condition. Pressing cancel will deactivate any cur-
rently active selections.
B. All CALL Pushbutton.
The ALL CALL pushbutton switch selects
and connects all zones to the currently selected input
source. Pressing the ALL CALL again returns the
system to the previous condition.
C. CANCEL Pushbutton.
The CANCEL pushbutton when pressed will
reset all the manually activated signaling functions
of the AR2000-M.
D. MONITOR SPKR.
A monitor speaker may be connected to the
unit at this output. Audio to this output will exist
during all conditions except when the microphone is
in use. This prevents any feedback from the micro-
phone.
E. ADDITIONAL ZONES.
An AR2000-Z may be connected to add on
additional 8 zones of control. If desired, up to seven
(7) total AR2000-Z units may be added to provide a
total of 64 zones.
F. ADDITIONAL PRESETS.
An AR2000-P may be connected to add on
additional 8 presets of control. If desired, up to seven
(7) total AR2000-P units may be added to provide a
total of 64 presets.
1-4. POWER.
In order to prevent power to the AR2000-M
from being accidentally turned off, the unit
has a power switch located on the back of the
unit. Before performing any installation or
maintenance, ensure that power is discon-
nected.
The front panel has a green LED to indicate the
presence of primary power. It also has a red LED to
indicate the presence of secondary power in use. The
AR2000-M can be operated from either a 120VAC,
240VAC or a 24VDC power source. The AC power is
connected via the power cord, which requires manual
switching in order to operate. 24VDC Backup con-
nects via the rear terminals directly underneath the
4-Amp, Bussman-type GMT indicating fuse.
If this unit is to be connected to a non-power
limited 24 volt dc supply, the National Electri-
cal Code (NFPA 70) requires that those leads
be separated from other classes of wiring
connected to this unit.
The AR2000-P and the AR2000-Z obtain power
directly from the AR2000-M.
1-5. AUDIO INPUTS.
Channel A and Channel B inputs are provided
in the back of the unit to couple standard 1 volt audio
signal from a background music source such as a
radio receiver, CD player or a tape player. The inputs
can also be selected to accept a 25Vrms or 70Vrms
input source. The Channel A input is selectable from
the front panel by depressing the Channel A selection
button. To select the Channel B input, depress the
Channel B selection button on the front panel. Only
Channel A or Channel B may be activated at one
time. It is not possible to activate both Channel A
and Channel B audio sources simultaneously.
1-6. MICROPHONE INPUT OPTION.
A Federal Signal Model MSB-1 microphone can
be connected directly to the AR2000-M via the
modular jack provided on the front of the unit (high-
est priority).
1-7. TELEPHONE INPUT OPTION.
A standard telephone line can be connected
directly to the AR2000-M via the modular phone jack
provided at the back of the unit. This allows the user
to contact the AR2000-M via phone, record a message
and deliver it to zones selected by the phone line
user.
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WARNING
WARNING