Federal Signal Corporation CommCenter D1 Series Manual

Model 300MB-SD
CommCenter Series D1
2561078I
Rev I2 1219
Printed in U.S.A.
Installation and Maintenance Manual
français...............page 21
español...............página 41

Warranty – Seller warrants all goods for five years on parts and 2-1/2 years on labor, under the following
conditions and exceptions: Seller warrants that all goods of Seller’s manufacture will conform to any descriptions
thereof for specifications which are expressly made a part of this sales contract and at the time of sale by Seller
such goods shall be commercially free from defects in material or workmanship. Seller reserves the right at the
Seller’s discretion to “Repair and Return” or “Replace” any item deemed defective during the warranty period.
This warranty does not cover travel expenses, the cost of specialized equipment for gaining access to the
product, or labor charges for removal and reinstallation of the product. This warranty shall be ineffective and shall
not apply to goods that have been subjected to misuse, neglect, accident, damage, improper maintenance, or
to goods altered or repaired by anyone other than Seller or its authorized representative, or if five years have
elapsed from the date of shipment of the goods by Seller with the following exceptions: lamps and strobe tubes
are not covered under this warranty. Outdoor warning sirens and controllers manufactured by Federal Warning
Systems are warranteed for two years on parts and one year on labor. No agent, employee, representative or
distributor of Seller has any authority to bind the Seller to any representation, affirmation, or warranty concerning
the goods and any such representation, affirmation or warranty shall not be deemed to have become a part of
the basics of the sales contract and shall be unenforceable. THE FOREGOING WARRANTIES ARE EXCLUSIVE
AND IN LIEU OF ALL OTHER WARRANTIES OR MERCHANTABILITY, FITNESS FOR PURPOSE AND OF ANY
OTHER TYPE, WHETHER EXPRESS OR IMPLIED. These warranties shall not apply unless Seller shall be given
reasonable opportunity to investigate all claims for allegedly defective goods. Upon Seller’s instruction a sample
only of allegedly defective goods shall be returned to Seller for its inspection and approval. The basis of all claims
for alleged defects in the goods not discoverable upon reasonable inspection thereof pursuant to paragraph 8
hereof must be fully explained in writing and received by Seller within thirty days after Buyer learns of the defect or
such claim shall be deemed waived.
2645 Federal Signal Drive • University Park, IL 60484
Tel: [phone] • 877-289-3246. Fax: [phone]
[email protected] • www.federalsignal-indust.com • www.fs-isys.com

3
Model 300MB-SD CommCenter Series D1
Table of Contents
Safety Message to Installers of Federal Signal Products................................................................... 5
Unpacking the Product .......................................................................................................................... 5
An Overview of the Model 300MB......................................................................................................... 6
Chassis Description .......................................................................................................................................7
Input Configuration........................................................................................................................................7
Control Circuitry............................................................................................................................................8
Power Requirements ......................................................................................................................................8
Recommendation for the Signal Lines............................................................................................... 10
Connecting Signal Lines..............................................................................................................................11
Connecting to Remote Devices........................................................................................................... 11
Balanced Line Application ..........................................................................................................................11
Unbalanced Line Application ......................................................................................................................12
Connecting a Low-Level Audio Input .........................................................................................................12
Connecting a Low-Level Audio Output.......................................................................................................13
Typical Installations of the 300MB ...................................................................................................... 13
As a SelecTone Control Center....................................................................................................................13
As a Remote Microphone and Message Playback.......................................................................................14
Driving a 25 Vrms Speaker Line ................................................................................................................14
Interfacing with a Central Amplified System ..............................................................................................15
As a Typical Central Power System .............................................................................................................15
Connecting Power to the CommCenter System................................................................................ 16
For 120 Vac Operation .................................................................................................................................16
For 240 Vac Operation .................................................................................................................................16
For 24 Vdc Operation...................................................................................................................................16
Safety Messages to Maintenance Personnel..................................................................................... 17
Installing Storage Chips ...................................................................................................................... 17
Getting Replacement Parts.................................................................................................................. 19
Returning a Product for Service ......................................................................................................... 19
Getting Technical Support................................................................................................................... 19
Returning a Product for Credit............................................................................................................ 19

4Model 300MB-SD CommCenter Series D1
SelecTone is a registered trademark of Federal Signal Corporation.
© 2013 Federal Signal Corporation. All rights reserved.
Figures
Figure 1 Dimensions and mounting holes ..........................................................................................................6
Figure 2 Connections on the back of Model 300MB.........................................................................................11
Figure 3 Model AM25CK connections (balanced line)......................................................................................12
Figure 4 Model 300CK connections (unbalanced line).....................................................................................12
Figure 5 Cascading multiple units.....................................................................................................................13
Figure 6 CommCenter as a SelecTone control center......................................................................................13
Figure 7 Model 300MB with remote microphone and message playback ........................................................14
Figure 8 Model 300MB with 25 Vrms connections ...........................................................................................14
Figure 9 Model 300MB with central amplier connections ...............................................................................15
Figure 10 Typical central power system ...........................................................................................................15
Figure 11 Model 300MB motherboard ..............................................................................................................18
Tables
Table 1 Kit contents.............................................................................................................................................5
Table 2 Model 300MB Series D motherboard.....................................................................................................8
Table 3 Product specications ............................................................................................................................9
Table 4 Replacement parts ...............................................................................................................................19

5
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Safety Message to Installers of Federal Signal Products
People’s lives depend on your proper installation and servicing of Federal Signal products. It is important to
read and follow all instructions shipped with this product. In addition, listed below are some other important
safety instructions and precautions you should follow:
• This device is to be installed by a trained electrician who is thoroughly familiar with the National
Electric Code and will follow the NEC guidelines as well as local codes.
• The selection of the mounting location for the device, its controls and routing of the wiring is to be
accomplished under the direction of the Facilities Engineer and the Safety Engineer.
• Read and understand all instructions before installing or operating this equipment.
• Do not connect this unit to the system when power is on.
• Optimum sound distribution will be severely reduced if any objects are in front of the speaker. You
should ensure that the front of the speaker is clear of any obstructions.
• All effective warning speakers produce loud sounds which may cause, in certain situations, permanent
hearing loss. You should take appropriate precautions such as wearing hearing protection.
• All effective warning speakers produce loud sounds, which may cause, in certain situations, permanent
hearing loss. The device should be installed far enough away from potential listeners to limit their
exposure while still maintaining its effectiveness. The OSHA Code of Federal Regulations 1910.95
Noise Standard provides guidelines, which may be used regarding permissible noise exposure levels.
• After installation, test the sound system to ensure proper operation.
• Show these instructions to your Safety Engineer and all operating personnel, and then file them in a safe
place and refer to them when maintaining and/or reinstalling the unit.
• Establish a procedure to routinely check the sound system for proper activation and operation.
Failure to follow all safety precautions and instructions may result in property damage, serious injury, or death.
Unpacking the Product
After unpacking the product, examine it for damage that may have occurred in transit. If the 300MB has been
damaged, do not attempt to install or operate it. File a claim immediately with the carrier, stating the extent of the
damage. Carefully check all envelopes, shipping labels, and tags before removing or discarding them. Disposal of
all shipping materials must be carried out in accordance with national and local codes and standards. If any parts
are missing, please call Federal Signal Customer Support at 708-534-4756 or 877-289-3246.
Table 1 Kit contents
Qty. Description Part Number
1 Plug, 10-Position 140332-10
1 Plug, 17-Position 140332-17

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Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
An Overview of the Model 300MB
The CommCenter, Model 300MB Series D1 is a digital playback device that is capable of generating up
to six different prerecorded voice messages, melodies, tones, and/or signals. This central control device
interfaces with any decentralized or centrally amplified system. The CommCenter can control signal lines to
Federal Signal SelecTone® Models 300GC, 300GCX, 300X, 302GC, 302GCX, 302X, and 50GC speaker/
amplifiers. It can also interface with any SelecTone Control Unit, Models 300VSC or 300SCW-1. It can
directly drive speakers designed for 25 Vrms line operation. It can also provide a 1 Vpp audio signal, and can
be used as a remote audio input for a public address sound system. Using the cascading function, 300MB
CommCenters can be linked together to provide a system with the capability of more than six messages.
NOTE: The CommCenter accepts messages stored on ICs and pluggable circuit boards. Both are referred to
as message chips in this manual. The messages stored on pluggable circuit boards will operate on all Series B,
Series C, and Series D models.
IMPORTANT: The Series D CommCenters use a different storage IC than the Series A, Series B, and Series
C. These ICs cannot be interchanged between Series A, Series, B, and Series C models. Make sure to specify
which series CommCenter you have before ordering any additional messages.
The CommCenter is intended to be installed only in indoor (NEMA 1) or other protected installations. It
can be mounted on any horizontal or vertical surface using #10 screws, appropriate for the type of mounting
surface material, and the four mounting holes in the housing (see Figure 1).
Figure 1 Dimensions and mounting holes
3
4
1
2
KNOCKOUT PROVISION
0.87 in (2.21 cm) DIA., 5 PLACES
290A7328
FIELD WIRING BLOCK FOR
120/240 V POWER CONNECTION
2.27 in
(5.77 cm)
1.06 in
(2.70 cm)
1.08 in
(2.74 cm)
2.86 in
(7.26 cm)
3.57 in
(9.07 cm)
9.41 in
(23.90 cm)
6.77 in
(17.20 cm)
1.18 in
(3.00 cm)
2.20 in
(5.59 cm)
1.28 in
(3.25 cm) 11.57 in
(29.40 cm)
2.15 in
(5.46 cm)
6.87 in
(17.45 cm)
9.75 in
(24.77 cm)
COVER REMOVED TO SHOW FOUR MOUNTING HOLES 0.20 in (51 cm) DIA., FOR #10 SCREWS

7
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
The CommCenter can be used for a variety of prioritized signaling purposes, such as indicating the status
of a machine or process, background messages, evacuation, alarm, start and dismissal, and other audible
notification applications. The system can be automated if external (customer-supplied) devices such as
programmable controllers, heat detectors, switches or program clocks are connected to the remote inputs.
This product is not listed for fire use.
A CommCenter plays and amplifies messages through signal lines to the remote SelecTone devices in the
system. To connect the SelecTone speaker/amplifier to the signal line, a Model AM25CK Connector Kit is
required in each SelecTone device. Speakers designed for 25-volt operation can connect directly to the
25-volt output.
Each message can be activated by a contact closure or opening at its associated remote control input. The
remote control inputs can be configured to work with either latching or momentary contacts.
Each CommCenter can accommodate up to six storage chips, selected from a library of prerecorded voice
messages, melodies, tones and/or signals. There is one message per storage chip. Each chip plugs into a
28-pin IC socket. The six sockets are labeled PRIORITY TONE 1 through PRIORITY TONE 6 (see Figure 11
on page 18).
Chassis Description
The CommCenter is assembled in a black, powder-coated steel two-piece housing. The cover is
attached to the housing with four screws, two along each long edge of the enclosure. The rear of the
housing incorporates two field wiring compartments baffled off from the printed circuit board area.
One compartment is for the connection of the Class II power and signal lines, and the other is for the
connection of the Class I power lines. These areas are provided with knockouts to allow the external
wiring to enter the unit through appropriate installer-supplied bushings.
Input Conguration
The CommCenter can be configured for remote activation in four ways:
• Normally open latching contacts
• Normally open momentary contacts
• Normally closed latching contacts
• Normally closed momentary contacts
The CommCenter is factory-set to be activated by closing a normally open latching contact between the
associated input and circuit ground. When activated the message continues to loop and repeat. It stops
as soon as it is deactivated. When configured for momentary activation, the message continues to loop
and repeat until the input is deactivated. When the input is deactivated, it plays the entire message before
stopping.
Each of the six inputs can be individually configured by moving a two-position jumper on a three-
position header. See Table 2 on page 8 for a list of the priority tones, their associated jumper
designations, and their silkscreened labels printed circuit board.

8
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Table 2 Model 300MB Series D motherboard
MESSAGE JUMPER MARKING JUMPER MARKING
PRIORITY
TONE1 J9 NO NC J12 R M
PRIORITY
TONE 2 J10 NO NC J14 R M
PRIORITY
TONE 3 J11 NO NC J13 R M
PRIORITY
TONE 4 J5 NO NC J8 R M
PRIORITY
TONE 5 J4 NO NC J7 R M
PRIORITY
TONE 6 J3 NO NC J6 R M
NOTES:
NO NC congures an individual channel to inter-
face to normally open (NO) or normally closed
(NC) contacts.
R M congures an individual channel to inter-
face to a latched contact (R) or a momentary
contact (M).
Control Circuitry
The control circuitry in the CommCenter has a built-in priority level feature. If a message is already
sounding when a higher priority message is activated, the higher priority message automatically
overrides the lower priority message. When the higher priority message is deactivated, the lower priority
message is initiated as long as it is still activated. The messages are prioritized with Priority Tone 1
having the highest priority down to Priority Tone 6. The cascade input has the lowest level of priority.
A message can be activated from the tone activation inputs on TB1. For example, a dry contact,
either normally open or normally closed (depending on the configuration) will activate a tone when
it is connected between the associated message (TB1-1 through TB1-6) and COM (TB1-7). The
configuration of these channels is described in "Input Configuration" on page 7. These inputs are opto-
coupled to reduce the possibility of noise on the signal lines falsely activating a message.
There are two sets of contacts that can be used to monitor the status of a CommCenter. When power is
applied, a relay with form C contacts is activated. These contacts are connected to TB2 and are labeled
Power Monitor Relay. The second set of contacts monitor activation of any of the six messages or a
cascaded input. These contacts are labeled Push-to-Talk (PTT) Relay on TB1.
Power Requirements
SHOCK HAZARD —Do not perform any installation or maintenance on this
system when power is on. Because the 300MB does not have a power switch,
ensure that the power is disconnected before proceeding. Failure to heed
this warning may cause serious injury or death.
The Model 300MB can be operated on 120 Vac, 240 Vac, or 24 Vdc input power. To prevent power to the
CommCenter from being accidently turned off, the unit does not have a power switch.

9
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Table 3 Product specications
Power Input
Input Voltage 120/240 Vac, 50 Hz to 60 Hz; 24 Vdc
Standby Current 50 mA, 120 Vac
25 mA, 240 Vac
Operating Current 210 mA (max.)
Power Consumption 26 W (max.)
Emergency Power Source Input
Input Voltage 22 Vdc to 32 Vdc
Standby Current 90 mA
Operating Current 760 mA
Audio/Cascade Input
Input Impedance 5 k Ω
Input Voltage 1 Vpp (max.)
Audio Outputs
Output Impedance
Unbalanced Signal Line 25 Ω (max.)
Unbalanced Signal Line, Standby 120 Ω
Balanced Signal Line 40 Ω (max.)
Low-Level Signal Line 600 Ω
Output Voltage Levels, No Load (< 3% THD)
Unbalanced Signal Line 9 Vrms
Balanced Signal Line 17 Vrms
Low-Level Signal Line 1 Vpp
Output Voltage Levels, Max. Load (< 3% THD)
Unbalanced Signal Line 8 Vrms (25 Ωload)
Balanced Signal Line 15 Vrms (40 Ωload)
Low-Level Signal Line 1 Vpp (600 Ωload)
Tone Output Voltage Levels, No Load (sq. wave)
Unbalanced Signal Line 12 Vrms
Balanced Signal Line 25 Vrms
Low-Level Signal Line 1 Vpp
Tone Output Levels Max. Load (sq. wave)
Unbalanced Signal Line 12 Vrms (25 Ωload)
Balanced Signal Line 20 Vrms (40 Ωload
Low-Level Signal Line 0.56 Vrms (600 Ωload)
Signal to Noise Ratio (< 1.5 % THD)

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Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Chip Input 67 dBA
Table 3 Product specications (continued)
Audio Frequency Response, Balanced Signal Line
40 Ω Max. Load, from 250 Hz to 80 kHz
(Reference 1 kHz) -3 dB
40 Ω Max. Load, from 450 Hz to 60 kHz
(Reference 1 kHz) -1 dB
No Load, from 100 Hz to 90 kHz
(Reference 1 kHz) -3 dB
No Load, from 200 Hz to 60 kHz
(Reference 1 kHz) -1 dB
Audio Distortion from Cascade Input to Balanced Signal
Line Output (40 Ω Load) 0.2 %
Fuses
F1 Type GMC-1, 1 A, 250 V
F2 Type GMC-1/2, 1/2 A, 250 V
Physical Specications
Weight
Shipping 6.6 lb (3.0 kg)
Net 5.5 lb (2.5 kg)
Dimensions (D,W, H) 2.27 in x 9.41 in x 11.57 in
(57,7 mm x 239,0 mm x 293,9 mm)
Operating Temperature 32° F to 120° F (0° C to 49° C)
Recommendation for the Signal Lines
REDUCED SOUND OUTPUT —If too small a diameter cable is used, unacceptable
signal voltage drop in the signal line will cause reduced sound output from the
remote signal device. Only use a cable having wire diameter greater than 22 AWG.
The signal lines transfer tone signals and verbal messages from the CommCenter to the remote SelecTone
devices. To reduce the possibility of cross talk, hum, and static-noise pickup, the signal lines must be twisted-
pair, shielded audio cable. In the majority of systems, use AWG 18 twisted-pair audio cables. Federal Signal
does not recommend that new or existing telephone lines be used as signal lines in a SelecTone system for
the following reasons:
✓Interference from other services or systems, or interference from the system to other services
✓Cross talk, interference, or hum induced by other telephone lines
✓Extended downtime because of the second party involvement required to service the lines
✓The additional cost of installation, interfacing devices and monthly charges as opposed to a one-time
cost of performing the installation

11
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Connecting Signal Lines
CROSSTALK INTERFERENCE — Mixing signal lines with power lines could
cause electrical interference, which could impede or render the system
inoperable. Do not install signal lines in the same conduit with power lines.
SHOCK HAZARD —Do not install signal lines in the same conduit with power
lines. Avoid routing signal lines on cable trays with high voltage power lines.
See Figure 2. To connect the signal lines of the SelecTone system to the 300MB, connect a color-
coded, twisted pair of audio cables with conductors no smaller than 18 AWG to the TB1-13 and TB1-
14 terminals on TB1. Before using TB1-13 and TB1-14, remove the labeled jumper. Every remote
SelecTone signaling device in the system can be connected in parallel or series to these lines.
For non-SelecTone 25 Vrms speakers, such as ceiling speakers, connect the signal lines directly to TB1-13
and TB1-14 of terminal block TB1. Before using TB1-13 and TB1-14, remove the labeled jumper. Signal
line losses must be considered when calculating how many speakers can be connected to the 300MB.
Figure 2 Connections on the back of Model 300MB
NOT USED NOT USED + 24VDC - 24VDC POWER DOWN NO NC COM ENABLE SIGNAL MIC OUT SIG COM SIG HI SIG SIG SIGNAL ENABLE COM NC NO COM MESSAGE 1 MESSAGE 2 MESSAGE 3 MESSAGE 4 MESSAGE 5 MESSAGE 6
290A7329
PTT RELAY
CASCADE IN CASCADE OUT
POWER MONITOR RELAY
25 VRMS LINE
GND
120/240 Vac
CLASS II FIELD WIRING
COMPARTMENT
CLASS I FIELD WIRING
COMPARTMENT
KNOCK-OUTS IN
REAR OF HOUSING
MODEL 300MB REAR VIEW
(BACK OF HOUSING IS REMOVED FOR CLARITY)
OUTPUT LEVEL
TB2 TB1
10 9 8 7 6 5 4 3 2 1 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Connecting to Remote Devices
Physically install the remote SelecTone device(s) following the instructions included with the device.
Balanced Line Application
See Figure 3 on page 12. For 300GC, 300GCX, 300X, 302GC, 302GCX, 302X or 50GC speakers, an
AM25CK Connector Kit is required for connection to the balanced signal output of the 300MB. The
AM25CK properly terminates the balanced signal lines to the amplifier in the 300GC, 300GCX, 300X,
302GC, 302GCX, 302X and 50GC. Remove the labeled jumper from terminals TB1-13 and TB1-14
of terminal block TB1. As shown in Figure 3, connect the white input wires on the AM25CK to the
terminals TB1-13 and TB1-14 of terminal block TB1 on the 300MB. The AM25CK and AM70CK
Connector Kits are NOT polarity sensitive, but polarity must be observed when placing speakers in close
proximity to each other.

12
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Figure 3 Model AM25CK connections (balanced line)
300GC
TERMINAL BLOCK (TB1)
ON REAR OF 300MB
AM25CK
300GC
AM25CK
14 13
290A7443
SHIELDED TWISTED PAIR
SIGNAL LINE TO ADDITIONAL
SELECTONES
For 25 Vrms line-operated speakers, connect them directly to the balanced signal output of the 300MB.
Remove the labeled jumper from terminals TB1-13 and TB1-14 of terminal block TB1. Connect the
speakers in parallel to the terminals TB1-13 and TB1-14 of terminal block TB1 on the 300MB. Unlike the
unbalanced line output, this output is not switched.
IMPORTANT: This output is to be used only if there are no SelecTone system devices connected to the
unbalanced signal output (across TB1-15 and TB1-16).
Unbalanced Line Application
See Figure 4. For existing SelecTone systems using the 300CK Connector Kit, use the unbalanced signal
outputs on the 300MB. A 300CK Connect Kit is required to connect a 300GC, 300GCX, 300X, 302GC,
302GCX, 302X or 50GC to the unbalanced signal lines. The 300CK properly terminates the signal lines
to the amplifier in the 300GC, 300GCX, 300X, 302GC, 302GCX, 302X and 50GC. Connect the blue wire
on the 300CK to the SIG COM wire from the 300MB. Connect the yellow wire on the 300CK to the SIG HI
wire from the 300MB.
Figure 4 Model 300CK connections (unbalanced line)
290A7332
300GC
TERMINAL BLOCK (TB1)
ON REAR OF 300MB
YEL BLU YEL BLU
300CK
300GC
300CK
COM SIG
HI
16 15 SHIELDED TWISTED
PAIR SIGNAL LINE TO
ADDITIONAL SELECTONES
Connecting a Low-Level Audio Input
See Figure 5 on page 13. There is a provision for a low-level, low-impedance audio signal input at the
rear of the 300MB. It is designed to accept a cascaded input from a master CommCenter (TB1-12. But it
also accepts audio from a telephone system, radio receiver, CD player, or tape player. When the ENABLE
pin (TB2-2) on the cascade input is pulled to circuit ground, audio on the cascade-in signal line is gated
through the CommCenter and output on the signal lines. This input is the lowest priority. The audio-level
input should be 1 Vpp. When cascading units, connect the cascade-out ENABLE and SIGNAL terminals
and the ground of the slave unit to the cascade-in ENABLE and SIGNAL terminals on the master unit.The
SIG COM terminals (TB1-16) of both units also need to be connected together as shown in Figure 5.

13
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Figure 5 Cascading multiple units
GROUND
MASTER
SLAVE
SIGNAL
ENABLE
CASCADE
OUT
120/240 Vac
GROUND
290A7317
10 2 1 1716 1514 1
10 16 12 11 11
TB2 TB1
TB2
GAIN
CNTR
GAIN
CNTR
TB1
120 Vac 120 Vac 120 Vac
LOCAL PWR. LOCAL PWR.
POWER LINES
MODEL
300GC
MODEL 300MB
MODEL 300MB
MODEL
AM25CK
SIGNAL LINES SHIELDED
TWISTED PAIR
SIGNAL
ENABLE
CASCADE IN
120/240 Vac
13
Connecting a Low-Level Audio Output
The 300MB also has a 1 Vpp audio output that is designed to drive the cascaded input of a slave
CommCenter. This low-level output is available across terminals TB1-16 and TB1-17. It can also be
connected to an analog fiber optic transmitter so that audio can be transmitted over a fiber-optic link in
an electrically noisy environment.
Typical Installations of the 300MB
This section describes four typical installations of the 300MB system.
As a SelecTone Control Center
In this installation, shown in Figure 6, the CommCenter is acting as a SelecTone control center driving a
25 Vrms signal line. Remote speaker/amplifiers have the signal coupled in through an AM25CK.
Figure 6 CommCenter as a SelecTone control center
GROUND
290A7321
10 1 17 16 15 1
TB2 TB1
GAIN
CNTR
MODEL 300GC
MODEL 300MB
MODEL AM25CK
SIGNAL LINES SHIELDED
TWISTED PAIR
120/240 Vac
120 Vac 120 Vac
LOCAL PWR. LOCAL PWR.
POWER LINES
1413

14
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
As a Remote Microphone and Message Playback
See Figure 7. This installation uses a 300MB interface with a 300VSC-1 or 300SCW-1. The CommCenter
acts as a remote microphone audio input and adds message playback capability to a SelecTone system.
Adjust the gain on the 300MB so that the audio output is at the required audio input level for the remote
microphone input (16 mVrms max.) on the 300VSC-1 and the 300SCW-1. Failure to adjust the gain causes
distortion and clipping in the system.
Figure 7 Model 300MB with remote microphone and message playback
GROUND
290A7517
10 1 17 16 10 8 1
TB2 TB1
GAIN
CNTR
4 5 1 7 12 13 1417 16
TB1 TB2
MODEL 300GC
MODEL 300VCS-1
120 VCA
MODEL 300MB
MODEL AM25CK
SIGNAL LINES
SHIELDED
TWISTED PAIR
120/240 Vac
120 Vac 120 Vac 120 Vac
LOCAL
POWER
LOCAL
POWER
POWER
LINES
CONNECTIONS TO 300MC
TB1-8 PTT-NO
PTT-COM
SIG COM
MIC OUT
PTT
GND
MIC COM
MIC AUDIO IN
TB1-10
TB1-16
TB1-17
TB2-13
TB2-7
TB2-14
TB2-12
300MB
300VSC-1/300SCW-1
Driving a 25 Vrms Speaker Line
See Figure 8. In this installation the CommCenter is directly driving one or more speakers. The total
power consumed must not exceed the drive capability of the CommCenter.
Figure 8 Model 300MB with 25 Vrms connections
GROUND
290A7333
10 1 17 14 13 1
TB2 TB1
GAIN
CNTR
MODEL 300MB
SIGNAL LINES
SHIELDED
TWISTED PAIR
120/240 Vac
TB1-13
TB1-14
SIGNAL -
SIGNAL +
TO ADDITIONAL SPEAKERS,
40 OHMS MAXIMUM LOAD

15
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Interfacing with a Central Amplied System
See Figure 9. In this installation the CommCenter is acting as an audio input to a central amplifier.
Message playback can be added to an existing centrally amplified paging system.
Figure 9 Model 300MB with central amplier connections
GROUND
290A7334
10 1 1716 1
TB2 TB1
GAIN
CNTR
MODEL 300MB
CENTRAL AMPLIFIER
SIGNAL LINES
SHIELDED
TWISTED PAIR
120/240 Vac TB1-16
TB1-17
SIGNAL COMMON
MICROPHONE OUT
TO ADDITIONAL SPEAKERS,
40 OHMS MAXIMUM LOAD
AUDIO INPUT
As a Typical Central Power System
See Figure 10. In this installation a 24 Vdc power supply, such as a Model PS600, is driving the
CommCenter and one or more speakers. For additional information, including jumper removal, see
"For 24 Vdc Operation" under "Connecting Power to the CommCenter System" on page 16.
Figure 10 Typical central power system
290A7517
GROUND
10 8 7 115 1
TB2 TB1
GAIN
CNTR
MODEL 300GC
24 Vdc
MODEL 300MB
AM25CK
120/240 Vac NOT USED WITH THE MODELPS600
24 Vdc
POWER SUPPLY
+
–
–SIGNAL LINES,
SHIELDED TWISTED PAIR
+
OUTPUT
POWER
LINES
1617

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Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Connecting Power to the CommCenter System
QUALIFIED INSTALLERS ONLY —This device is to be installed by a trained
electrician who is thoroughly familiar with the National Electric Code and will
follow the NEC guidelines as well as local codes.
SHOCK HAZARD —Do not perform any installation or maintenance on this
system when power is on. Because the 300MB does not have a power switch,
ensure that the power is disconnected before proceeding. Failure to heed this
warning may cause serious injury or death.
CROSSTALK/INTERFERENCE HAZARD — Mixing power lines with signal lines
can cause cross talk, interference, or hum in the signal lines, which interferes
with the emergency warning capability of this equipment. Do not install power
lines in the same conduit as signal lines.
Operating power is connected to the 300MB through the three-position, field-wiring terminal block located
at the back of the unit. Two knockout openings are provided. One knockout should be removed and provided
with a bushing through which the power lines can be routed into the field wiring compartment.
For 120 Vac Operation
The 300MB is factory-set for 120 Vac operation.
For 240 Vac Operation
See Figure 2 on page 11. Set switch SW1 on the motherboard to the 240 V position.
For 24 Vdc Operation
See Figure 10 on page 15. If using 24 Vdc either as a primary or auxiliary source of power, remove the
labeled jumper from terminals TB2-7 and TB2-8 of terminal block TB2, before using these positions.
Connect the "+" terminal of 24 Vdc power supply to the terminal TB2-8 (+24 Vdc) and "–" terminal of the
24 Vdc power supply to the terminal TB2-7 (-24 Vdc) of the TB2 terminal block located in the back of the
300MB. Install a Class II power supply, such as a Federal Signal PS600, and its associated wiring.

17
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Safety Messages to Maintenance Personnel
This device is to be serviced by a trained electrician who is thoroughly familiar with the National Electric
Code and will follow the NEC guidelines as well as local codes.
This service information is for qualified personnel only. To avoid electric shock, do not perform any servicing
other than changing fuses, unless qualified to do so. Refer all servicing to qualified service personnel.
Listed below are some important safety instructions and precautions you should follow:
• Read and understand all instructions before operating this system.
• Do not perform any maintenance on this system when power is on. Because the 300MB does not have a
power switch, ensure that the power is disconnected before proceeding.
• Read and understand all instructions before operating this system.
• Always insure that the power to the 300MB is disconnected before removing the metal cover.
• Do not connect this unit to the system when power is on.
• All effective warning speakers produce loud sounds which may cause, in certain situations, permanent
hearing loss. You should take appropriate precautions such as wearing hearing protection.
• After installation, test the sound system to ensure proper operation.
• Establish a procedure to routinely check the sound system for proper activation and operation.
Failure to follow all safety precautions and instructions may result in property damage, serious injury, or death.
Installing Storage Chips
SHOCK HAZARD —Do not perform any installation or maintenance on this
system when power is on. Because the 300MB-SD does not have a power switch,
ensure that the power is disconnected before proceeding. Failure to heed this
warning may cause serious injury or death.
STATIC SENSITIVE DEVICE — The circuitry of the storage chips and of the
CommCenter can be destroyed or damaged by static discharge. Observe anti-
static procedures when installing or maintaining a CommCenter.
NOTE: Perform the procedures in this section ONLY if you need to change the priority of the storage chips
or are adding a different message to the unit 300MB.
The CommCenter accepts messages stored on ICs and pluggable circuit boards. Both are referred to as
message chips in this manual. The messages stored on pluggable circuit boards will operate on all Series
B, Series C, and Series D Models. The Series D CommCenters use a different storage IC than the Series A,
Series B, and Series C. These ICs cannot be interchanged between Series A, Series, B, and Series C models.
Make sure to specify which series CommCenter you have before ordering any additional messages.
The 300MB can accommodate up to six storage chips. The CommCenter is be shipped from the factory with

18
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
the storage chips installed. Each storage chip is marked with the Model Number and other information.
Storage chips should be installed starting at Priority Tone 1 and working downward. If, for example, only
four messages are required, have PT1 through PT4 sockets occupied and leave PT5 and PT6 open.
To remove a storage chip, gently pry it out of its socket. To install a storage chip insert it into the proper
socket on the printed circuit board as shown in Figure 11. Ensure that the notch on the edge of the new
storage chip is facing in the same direction as the old one, i.e., next to the resistors at the edge of the board,
and that all pins are properly inserted in the socket and not bent under.
Figure 11 Model 300MB motherboard
290A7316
R
NO
R
J12
TONE1
R
NO J9
M
NC
R
J6
M
1
J11
J13
NC
TONE2
J14
J10
M R
NO
J7 M R
NC
TONE3
M
J8 M
NO
TONE6
NO J3 NC NC
TONE5
J4 NO NC
TONE4
J5
TONE 2
PRIORITY
PRIORITY
TONE 3
PRIORITY
PRIORITY
PRIORITY
TONE 6
TONE 4
TONE 5
PRIORITY
TONE 1
IC22IC16 IC17
IC9 IC12IC7
L
O
V
I
GMC-1A
F2
SW1
J2
TB2
B W
GMC-1/2A
F1
200D1148 250V
240V 120V
250V
TB1

19
Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Getting Replacement Parts
Typical replacement parts are listed in Table 4. To order accessories and replacement parts, please call Federal
Signal Customer Support at 708-534-4756 or 877-289-3246.
Table 4 Replacement parts
Description Numéro de pièce
Blank Message Module RMB9999SD
Pre-Recorded Message Module RM1SD
Returning a Product for Service
Products returned for repair require a Return Authorization form from your local distributor or from Federal
Signal. To obtain repair service or technical assistance from Federal Signal, call 708-534-4756 or 877-289-
3246.
Getting Technical Support
For technical support, please call Federal Signal at 1 708-534-3424, extension 5823 or 877-289-3246. For
instruction manuals and information on related products, visit: http://www.federalsignal-indust.com.
Returning a Product for Credit
Product returns for credit require a return authorization from your local distributor prior to returning the
product to Federal Signal. Please contact your distributor for assistance.
A product is qualified to be returned for credit when the following conditions are met:
• Product is resalable and in the original cartons
• Product has not been previously installed
• Product is the current revision
• Product has not been previously repaired
• Product is a standard product
• Product is not a service part
All returns are subject to a re-stock fee.
Defective products that are returned within the warranty period will be repaired or replaced at Federal
Signal’s sole discretion. Defective products do not include those products with lamp failure.
Circumstances other than those listed above will be addressed on a case-by-case basis.

20
2645 Federal Signal Drive • University Park, IL 60484
Tel: [phone] • 877-289-3246. Fax: [phone]
[email protected] • www.federalsignal-indust.com • www.fs-isys.com