Whelen Engineering Company IPS 400 User manual

IPS 400/800
IN-PLANT PERSONNEL WARNING SYSTEM
Product Manual
R
IPS
SYSTEM
PIONEERS IN WARNING SIGNALS
ENGINEERING COMPANY, INC
Route 145, Winthrop Rd., Chester, CT 06412-0684
Tel.: (800) 63SIREN

The purpose of this manual is to provide the user with a
general description of the theory, operation, installation
set-up and maintenance of an IPS-400 or IPS-800, In-Plant
Personnel Warning System.
This manual contains information proprietary to Whelen
Engineering Company, Inc. Any reproduction of this
manual is expressly prohibited except as Whelen
Engineering Company, Inc. may otherwise agree to in
writing.
Whelen Engineering Company, Inc. reserves the right to
revise and improve its product as it sees fit.
Manual # 04-0113276-00C
was # 04-0115924-01C
Copyright 1996 Whelen Engineering Company, Inc.
All rights reserved.
13276

Table of Contents
Section 1 INTRODUCTION ..............................................................................................2
1.0 Introduction to the IPS......................................................................................................2
1.1 Using This Manual ...........................................................................................................2
Section 2 IPS CONTROLLER DESCRIPTION...............................................................3
2.0 Controller System Description...........................................................................................3
2.1 Physical Description..........................................................................................................3
2.2 Operational Description ....................................................................................................4
2.2.1 System Activation/Control Methods..................................................................................4
2.2.2 Timing Selection and Duration .........................................................................................4
2.2.3 Audio Characteristics of Warning Signals.........................................................................4
Section 3 SPECIFICATIONS.............................................................................................5
3.0 General Specifications.......................................................................................................5
Section 4 MODULE DESCRIPTION................................................................................ 6
4.0 IPS Module Descriptions...................................................................................................6
4.1 ESC-864 (Controller)........................................................................................................6
4.1.1 Local Controls and LED Indicators...................................................................................6
4.1.2 ESC-864 Controller Circuit Board ....................................................................................9
4.1.3 Tone Generator.................................................................................................................9
4.1.4 Digital Voice (option) .......................................................................................................9
4.1.5 Landline or RF Link Interfaces (options)...........................................................................9
4.1.6 DTMF Formats.................................................................................................................9
4.1.7 Radio Receiver/Transceiver (option) ...............................................................................11
4.1.8 Local Microphone Input and Volume Control.................................................................11
4.1.9 System Diagnostics.........................................................................................................11
4.2 Power Amplifier Operation .............................................................................................11
4.2.1 Speaker Configurations...................................................................................................12
4.3 System Driver Board.......................................................................................................13
4.3.1 Audio Signal Distribution ...............................................................................................13
4.3.2 IPS Silent Test Operation................................................................................................13
4.3.3 Power Saving Logic........................................................................................................14
4.3.4 DC Voltage Regulation...................................................................................................14
4.4 Battery Charger Operation..............................................................................................14
4.5 Batteries..........................................................................................................................14
Section 5 INSTALLATION.............................................................................................. 15
5.0 Installation Instructions...................................................................................................15
5.1 Site Selection ..................................................................................................................15
5.2 Receiving/Unpacking the IPS..........................................................................................17
5.3 Installation of the IPS Cabinet.........................................................................................17
5.3a Installation of the “Type C” Cabinet................................................................................18
5.4 Conduit Openings for the IPS Cabinet.............................................................................19
5.5 AC Wiring......................................................................................................................20
5.6 Speaker Wiring...............................................................................................................21
5.7 Radio Option...................................................................................................................22
Section 6 BATTERIES..................................................................................................... 23
6.0 Battery Installation..........................................................................................................23

6.1 Battery Connections........................................................................................................23
Section 7 CONTROLLER PROGRAMMING................................................................ 24
7.0 ESC-864 Controller Programming..................................................................................24
7.1 User E2 PROM Programming..........................................................................................24
7.2 ESC-864 Encoding/Decoding Parameters........................................................................24
7.3 Warning Tone Timing Programming..............................................................................24
7.4 DIP Switch Programming ...............................................................................................25
Section 8 TESTING & TROUBLESHOOTING............................................................. 27
8.0 System Testing & Troubleshooting..................................................................................27
8.1 Initial Operational Checkout...........................................................................................27
8.2 System-Level Faults and Troubleshooting Procedures .....................................................27
8.3 IPS Remote Activation Faults..........................................................................................30
Section 9 REPLACEMENT ............................................................................................. 32
9 0 Replacements Procedures................................................................................................32
9.1 ESC-864 Controller Replacement....................................................................................32
9.2 System Driver Board Replacement .................................................................................32
9.3 Power Amplifier Replacement.........................................................................................32
9.4 Battery Charger Replacement..........................................................................................32
Section 10 INSPECTION ................................................................................................... 33
10.0 Routine Inspections.........................................................................................................33
Appendix
Siren Command Definitions
Siren Command Response Structure
Remote Siren Response Definitions

2
Section 1 INTRODUCTION
1.0 Introduction to the IPS
Information on the operation, installation, and maintenance of the Whelen Engineering Company’s In-Plant Personnel
Warning System (IPS) is provided in this technical manual. The IPS-400 and the IPS-800 are essentially the same. The
IPS- 400 has a single 400 watt amplifier, while the IPS-800 has two. This means that the IPS-800 can drive 800 watts of
audio power versus 400 watts for the IPS-400. The IPS-800 also has more battery capacity than the IPS-400. In the
majority of cases throughout this manual, all IPS models will be referred to as an IPS.
The IPS is a complex system, capable of generating six standard warning signals and Public Address (PA). The IPS can
operate with various combinations of speakers. The IPS may be linked to a central control point or points via radio
frequency (RF) or landline (telephone circuit, dry contact or dual tone multifrequency via twisted pair), permitting
multiplexed control and status feedback.
A typical In-Plant System consists of a Control Cabinet, with an ESC-864 Controller, 1 or 2 Power Amplifiers, a System
Driver Board, a Battery Charger and Batteries. In addition, a system may include some number of various types of
speakers.
1.1 Using This Manual
This manual is divided into a number of sections. Much of the discussion relates to generic Whelen Engineering
Company, Inc. siren operation, which is consistent with other Whelen products, like the WPS-2800 Series. Since every
IPS system has a control cabinet, it is covered in the most detail. Optional system components, such as; speakers or
strobes are discussed in individual sections or in separate Product Description sheets.

3
Section 2 IPS CONTROLLER DESCRIPTION
2.0 Controller System Description
This section provides a general description of the IPS siren controller, including a physical description and a functional
description of the system. The functional description includes system activation methods, timing selection, signal and
audio characteristics, and power requirements.
2.1 Physical Description
The IPS is housed in an aluminum cabinet having two compartments. Each compartment has a raised, rolled lip along
its perimeter, and each compartment has a fully gasketed door. The lower compartment houses two Gel type batteries.
An IPS-400 is equipped with two, 31 Ampere Hour batteries; an IPS-800 has two, 55 AH batteries. The upper
compartment contains the electronic modules, such as the ESC-864 Controller and Tone Generator, the Power
Amplifiers, the Battery Charger and the System Driver Board.
The modules are described in detail in Section 4.
SYSTEM DRIVER BOARD
BATTERY CHARGER
BATTERIES (31 AMP-HOUR AS SHOWN)
CONTROLLER

4
2.2 Operational Description
As previously mentioned, the IPS is a self-contained, microprocessor-controlled warning system capable of generating
six standard siren warning signals, public address broadcast, and strobe light signaling. The standard warning signals--
WAIL, ALERT, ATTACK, AIR HORN, HI/LO, AND WHOOP--are described in detail in Section 4.1.1.
The IPS is powered by a 115 VAC, 1.5 Amp service. A battery charger maintains two, 12 VDC, Gel type batteries, wired
in series, at an optimum charge level. The IPS actually operates from the 24 volts provided by the batteries. Fully charged
batteries will run an IPS for at least thirty minutes.
2.2.1 System Activation/Control Methods
The IPS maybe controlled through local or remote means, as follows:
Local Control. Pushbuttons on the front panel, of the ESC-864, provide immediate activation of warning tones, public
address and SI TEST®. A microphone, for PA announcements, may be plugged into the microphone jack on the
controller front panel. Detailed descriptions of each control on the front panel of the ESC-864 is provided in Section
4.1.1.
Remote Control. Remote control of an IPS may be accomplished by landline or radio transmission. The standard
communication protocol is a ten digit DTMF (dual tone multi frequency) format. For landline control, an encoder is
required at a central control point. For radio transmission, an encoder, connected to a transceiver, is used at the central
control point. In either case, an optional interface must be selected for the IPS.
2.2.2 Timing Selection and Duration
The timing of each activation, local or remote, is controlled by the ESC-864 controller. The ESC-864 is capable of
timing any remote station activation for a duration of one second to ten minutes. The factory-standard for activation time
durations is three minutes. Any activation in progress may be canceled by pressing the CLR (clear) pushbutton on the
ESC-864 front panel or bysending a CLEAR or CANCEL command.
2.2.3 Audio Characteristics of Warning Signals
The audio characteristics (frequency and sweep rate) for the IPS warning signals/tones are provided in Section 4.1.1.
Overall output sound pressure levels are dependent on the types of speakers and speaker layouts. All IPS warning signals
are United States Standard Warning Signals.

5
Section 3 SPECIFICATIONS
3.0 General Specifications
The table below refers to general specifications for an IPS control cabinet. Specifications for speakers and strobe lights
are available upon request.
IPS Specifications
PHYSICAL
DIMENSIONS Height: 32.5 inches (not including mounting flanges)
Width: 20.0 inches
Depth: 12.0 inches
WEIGHT IPS-400: 120 lb.
IPS-800: 160 lb.
ELECTRICAL
REQUIREMENTS AC Input: 120/240 VAC, 60Hz, 2 Amps
Battery Charger: 28 VDC nominal, 5.0 Amp
Batteries (IPS-400): two 12VDC, 31AH
(IPS-800): two 12VDC, 55AH
ENVIRONMENTAL
REQUIREMENTS Operating Temperature:-35 to 60oC
Storage Temperature: -65 to 125oC

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Section 4 MODULE DESCRIPTION
4.0 IPS Module Descriptions
This section provides an overview of the individual electronic modules in an IPS.
• ESC-864 (Controller)
• Power Amplifier(s)
• System Driver Board
• Battery Charger
• Batteries
4.1 ESC-864 (Controller)
The ESC-864 Controller is the microprocessor-based core of the IPS. The ESC-864 houses the following:
local pushbuttons and LED indicators,
the ESC-864 controller circuit board,
the tone generator,
as options:
digital voice,
landline or RF link interfaces,
radio receiver/transceiver.
4.1.1 Local Controls and LED Indicators
Local control is available at the front panel of the ESC-864, as described below.
Local Control and Indicator Functions
Control or
Indicator Control or Indicator Function
CLR Stops warning tones prior to completion of programmed time. Some tones "ramp down"
prior to turning off.
WAIL Siren tone. Initiates a slow rise, high-pitched tone for four seconds, followed by a softer,
winding-down for one second. This sound pattern continues for as long as the timing
duration is set.
ATK Siren tone for National Attack. Initiates a faster rise, high-pitched tone for one second,
followed by a winding down tone for one second. This sound pattern continues for as long
as the timing duration is set.
ALRT Siren tone for Alert. Initiates a quick rise then steady tone for as long as the timing
duration is set.
AIR HORN Siren tone. Initiates a pulsing buzzing tone which blasts in intervals of 1.6 seconds for as
long as the timing duration is set.
HI-LO Siren tone. Initiates a highly pitched tone with a "Dee" sound for 0.8 seconds, followed by
a lower-pitched "Doo" sound for 0.8 seconds. This sound pattern continues for as long as
the timing duration is set.
WHP Siren tone for Whoop. Initiates a high-pitched, repetitive rise-only sound for three seconds,
then stops. This sound pattern continues for as long as the timing duration is set.

7
Control or
Indicator Control or Indicator Function
WAIL 5 SEC Siren tone. Initiates a high pitched tone, followed by a softer, winding cry. Actual on time
is more than 5 seconds. NOTE: The five-second WAIL siren tone is often referred to as the
NOON TEST.
CW CW is not used with an IPS.
CCW CCW is not used with an IPS.
SI TEST® Initiates the SI TESTtone and the diagnostic SI TESTroutine.
XMIT TONE For use with remote station radio transceiver; causes transmission of DTMF tone via RF
link for tone modulation adjustment. The transmit tone level is adjusted by the transmit
level potentiometer on the ESC 864 front panel.
XMIT Actuates remote station radio transmitter push-to-talk (PTT) circuit. When tone squelch is
used with the transmitter, the XMIT function is used to adjust tone squelch modulation.
DC DC LED indicates that DC voltage is present during a siren tone or a SI TEST
activation.
FULL Full LED indicates that all properly loaded remote station speakers are operating during a
siren tone or a SI TESTactivation. Speakers < 60 Watts may not indicate correctly.
DIAGNOSTIC
OUTPUT Diagnostic output (25 pin connector) serves as the ESC 864 PC board (controller) input/output port for diagnostic and programming purposes. System diagnostic information
and programming is accomplished with the Whelen MDK-864 Diagnostic Keyboard used
in servicing or testing the IPS.
REPROGRAM This REPROGRAM pushbutton, which is recessed, is for use by technicians trained in the
use of the MDK-864 diagnostic keyboard for factory service purposes only. CAUTION:
Pressing this button will erase customer-specific programming and return the ESC
864 controller to default settings. Pressing this button will render the siren station
unresponsive to customer-specific activation until the unit is reprogrammed.
ROT ROT (LED) is not used with an IPS.
PART PART (partial) LED indicates that at least one speaker driver operated during a warning
tone or a SI TESTactivation. Speakers < 60 Watts may not indicate correctly.
AC AC LED indicates that AC voltage was present during a warning tone or a SI TEST
activation.
CLIPPING
INDICATOR The clipping indicator LEDs illuminate when a warning tone is active or when a public address signal of sufficient amplitude is processed by the tone generator.
MIC VOLUME This knob controls the output volume of local public address announcements. In
determining a sufficient volume adjustment for local public address announcements, the
clipping indicator LEDs should just begin to blink when the local announcement is
produced. This "blinking" indicates the maximum amplification of sound with negligible
distortion.
MIC This microphone jack is used for local public address announcements. Upon insertion of a
microphone plug into the jack, the timer set LED may come on for approximately one
second. To use the microphone, squeeze the lever on its side completely and verify that the
timer set LED illuminates. Use of the local microphone disconnects remote radio audio

8
Control or
Indicator Control or Indicator Function
input from the tone generator's input, eliminating outside interference. Removing the
microphone from the microphone jack restores the remote radio audio input.
XMIT The XMIT LED, when illuminated, indicates that the ESC-864 is actuating the IPS
transmitter push-to-talk (PTT) circuit and is transmitting data or a test tone.
PWR The PWR (power up) LED indicates that all modules in the remote station are powered up
and all parts of the system are ready to operate. For systems using AC power operating the
IPS battery charger, this LED is on at all times unless an AC outage occurs, prompting the
IPS to go into a power-saving mode.
DEC The DEC (decoder active) LED illuminates when the DTMF tone decoder receives and
processes incoming DTMF tones. The DEC LED appears to flash when it illuminates. This
is a normal condition, as it blinks for every valid DTMF digit that is decoded.
PROG The PROG (program) LED only illuminates when the MDK-864 Diagnostic Keyboard is
used and the program switch on the MDK-864 is in the ON position. When the program
LED is illuminated, the siren cannot be activated remotely.
SQ The SQ (Squelch) LED illuminates when the radio receiver detects that the appropriate
carrier frequency is active. For systems that have the optional programmable receive tone
squelch tone decoder, the LED only illuminates when the receive frequency, as well as the
subaudible tone squelch frequency tone, is detected.
TIM The TIM (timer set) LED illuminates whenever the system is activated by either radio link,
landline control, or from the front panel for any of the siren functions or public address.
XMIT LEVEL The XMIT (transmit) LEVEL adjustment potentiometer controls the modulation of the
DTMF tones that are transmitted when the remote station status reporting option is used.
RADIO
LEVEL The RADIO LEVEL adjustment potentiometer is used to set the audio level that will be
passed on to the tone generator from a radio receiver or landline audio input.
NOTE: The transmit level and the radio level adjustment potentiometers are preset at
the factory and should not be changed except by qualified personnel.
POWER AMP
LEDs The power amplifier LEDs, located on the front panel to the left of the ESC-864 case face
plate, are used for visual inspection and verification regarding the wiring circuit between
each power amplifier channel and its respective speaker drivers. One speaker driver is
wired to each power amplifier channel by a dedicated pair of wires. Upon activation of a
warning or siren tone, a SI TESTtone, or a public address signal of sufficient level, these
LEDs should illuminate, indicating a complete circuit. NOTE: The LEDs assume the IPS
is operating under proper speaker loading capacity. Without sufficient loading, the
LEDs will not operate effectively.Speakers < 60 Watts may not indicate correctly.

9
4.1.2 ESC-864 Controller Circuit Board
The ESC-864 Controller board allows for local activation of warning signals, plus remote control interfacing. It also
monitors system status and provides visual status indicators as described in the previous tables. The ESC-864 PC board
controls the tone generator. All DTMF processing is performed on the ESC-864 board.
4.1.3 Tone Generator
The tone generator is a separate PC board that is mounted to the ESC-864 board. The tone generator receives its
commands from the ESC-864 board. All siren tones and public address audio processing are accomplished within the
tone generator. The microphone jack and microphone volume control, as well as a clipping indicator, are also part of the
tone generator functionality.
4.1.4 Digital Voice (option)
The optional digital voice module is mounted onto the tone generator in the ESC-864 case. The digital voice module
allows the IPS to store prerecorded, digitized messages for transmission over the public address portion of the system.
Prerecorded, digitized 15, 30 and 60-second messages are available.
4.1.5 Landline or RF Link Interfaces (options)
As an option. the IPS may be remotely controlled either landline or RF link. Either method communicates via a DTMF
protocol. Remote control may be one-way or two-way. The one-way option simply controls the IPS, while the two-way
option controls the IPS and reports IPS status back to a central control point.
The built-in DTMF capability responds to activation commands and generates status responses. The formats and
definitions for Activation Commands and Status Responses are described below.
4.1.6 DTMF Formats
ACTIVATION WORDS
Activation Command Format
Area Code Station Address Code ID & CMD Set CMD
3 digits 4 digits 2 digits 1 digit
Activation Command (Definition of above Format)
Function Description
Area Code 3-digit code which allows up to 1000 area codes per frequency.
Station Address 4-digit code assigned to each warning system within an area code.
ID 1-digit ID code allowing up to 8 activation centers.
CMD Group 1-digit code allowing for 4 command groups.
CMD 1-digit code allowing for 16 commands.

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Status Response Format
Area Code Address Code Length Response Status Bytes
Digital Analog
3 digits 4 digits 1 digit 2 digits variable
length variable length
Status Response (Definition of Format)
Function Description
Area Code 3-digit code which allows up to 1000 area codes per
frequency.
Station Address 4-digit code assigned to each warning system within an
area code.
ID 1-digit ID code identifies the type of siren.
Length Informs base station as to the length of the response word.
Response 2-digit code which reports status of alarm responses,
inquiries, and command groups.
Status
Bytes 2 to 8-digit code carrying digital/analog status information.
IPS Status Descriptions
Status Reporting Information (Subject) Status Designation
Station AC Power on/off
Station AC Line Voltage 3-digit representation
Station DC Voltage 2-digit representation
Partial Amplifier and Speaker Driver operation
Ambient Temperature 3-digit representation
System Power Up Status on/off
Intrusion Alarm instant status response for open door condition
Low Battery Condition low batterystatus has been reached
Receiver Signal-to-Noise Ratio (S/N) 2-digit activation count

11
The ESC-864 board reports status information to a central control point in response to the following alarm conditions:
- a change-of-state alarm (user selectable on/off)
- instant response to individual activation (user selectable on/off) or
- response to individual interrogation.
In the event of an alarm condition, the ESC-864 board will transmit its status report three times to ensure that the
message is received. The first transmission will happen immediately upon change of status, the second transmission
fifteen (15) seconds after the first, and the third fifteen (l5) seconds after the second transmission. If, after these
transmissions, the RF link remains busy, the ESC-864 PC board will terminate transmission. With respect to this latter
statement, a squelch detect circuit is included within the ESC-864 board's design. This feature prevents interference with
other transmissions on the RF link. The squelch detect circuit will not transmit status information if the RF channel is
busy, and it will wait for a clear channel prior to transmitting. The ESC-864 may be configured to operate in the squelch
detect mode on the basis of noise squelch or tone-coded squelch.
The ESC-864 board provides service and diagnostic information concerning its radio receive link upon initiation of a
diagnostic sequence from the central control point by an E-864/M Encoder and Status Display. In response to carrier-
only and tone sequence, the ESC-864 PC board examines its receive signal-to-noise ratio and transmits this information
back to the central control point.
4.1.7 Radio Receiver/Transceiver (option)
The radio receiver/transceiver is typically installed in the ESC-864 housing. The radio receiver/transmitter option is
available at low band VHF (30-50 MHz), high band VHF (150-170 MHz), or UHF (450-470 MHz).
4.1.8 Local Microphone Input and Volume Control
The local microphone controls are mounted on the front panel of the ESC-864 housing, to allow the user to plug in a
microphone to access the public address channel of the IPS. While it may be obvious that the microphone plugs into the
jack, and that the microphone volume control knob allows for adjustment of the output level, a clipping indicator above
the microphone volume control knob is provided to indicate the distortion level of the microphone. During PA, the
clipping indicator should be flickering on and off (i.e., operating at minimal illumination levels).
4.1.9 System Diagnostics
All IPS systems are equipped with diagnostic capabilities. The diagnostics provide a basic summary of the system
operations concerning AC power, DC power, speakers, and power amplifiers. As previously described, the information
from the diagnostics is presented bythe various LEDs on the front panel of the ESC-864 housing.
4.2 Power Amplifier Operation
The power amplifiers are located on the backside of the front panel of the IPS. As previously stated, one 400 W power
amplifier is used in an IPS-400, while an IPS-800 is equipped with two power amplifiers. Each power amplifier has four
(4), 100 W speaker channels, for a total of 400 watts per amplifier.
Each power amplifier is powered by 24 VDC. The amplifiers are hard-wired to the system driver board. Each power
amplifier is protected by a 30 Amp fuse, near its connectors. The failure of one amplifier does not cause the failure a
second amplifier; however, all four power amplifier channels within a faulty power amplifier will fail in the case of a
blown fuse.
Each power amplifier is mounted on the backside of the front panel so that four (4) red LEDs are visible (on the front
side of the front panel), one for each 100 W channel of each power amplifier. These LEDs are used to monitor the

12
electrical circuit between a power amplifier channel and its respective speakers. The LEDs, indicate a complete circuit
from the respective power amplifier channel to the speakers and back when the power amplifier is in operation. An
active LED indicates that the power amplifier channel, system driver board, speaker wires, and speaker(s) are
functioning when a warning signal tone or public address mode is active. Speakers < 60 Watts may not indicate
correctly.
In the public address mode of operation, each appropriate power amplifier channel(s) increases its amplification output
by an additional 25% to compensate for the differential in power between voice audio signals and siren warning signals.
This increase in amplification assists in providing voice broadcasting at warning signal tone ranges.
4.2.1 Speaker Configurations
The IPS power amplifier(s) can be connected to various speakers and speaker configurations or arrangements. The table
below shows some common speakers and the number of speakers allowed per each 100 W channel on each power
amplifier.
Common Speakers and Speaker Arrangements
SPEAKER DESCRIPTION MAXIMUM SPEAKERS
PER CHANNEL
The WS15T/WS30T are weatherproof, 15 to 30 watt re-entrant loud speakers
with multi-tapped transformers for output adjustments. The WS15/WS30 do not
have transformers.
6: WS15T or WS15
3: WS30T or WS30
The WS15TR/WS15TEN are 15 watt re-entrant loudspeakers with multi-tapped
transformers for output adjustment. The WS15TR speaker is ideal for recessed
mounting applications. The WS15TEN speaker is for recessed mounting in
ceiling tiles.
5: WS15TR
5: WS15TEN
The WS100 heavyduty, 100 W re-entrant loud speaker with a wide-angle horn. 1: WS100
The WS100TCH Heavy Duty weatherproof, 100 watt wide-angle re-entrant
speaker with multi-tapped transformer output adjustment. The WS100CH does
not have the transformer.
1: WS100TCH or
1: WS100CH
The WSXPL60T loud speaker is used in areas having explosive or combustible
atmospheres. Thespeaker is UL and CSA listed, 60 W re-entrant, wide-angle
loud speaker and has a multi-tapped transformer.
1:WSXPL60T
Individual product descriptions maybe requested from the sales office, for each speaker in the table.

13
4.3 System Driver Board
The system driver board, shown to the
right, provides a number of functions in
the IPS. The functions are described in
paragraphs 4.4.1 through 4.4.5.
4.3.1 Audio Signal Distribution
Terminal block 1 (TB1) provides eight
sets of terminals, labeled with a plus (+)
and a minus (-), as shown.
Terminal block 2 (TB2) is not used in
an IPS system.
4.3.2 IPS Silent Test Operation
The IPS can produce an inaudible tone
for system testing purposes. The
function of this feature, which may be
initiated by pressing the SI TEST®
pushbutton on the front panel of the
ESC 864 controller, is to exercise the
system speaker drivers in the same
manner as a fully powered, audible
warning signal.
By pressing the SI TEST® pushbutton,
the user may observe the power
amplifier LEDs to determine if a
complete circuit is active between each
speaker (or group of speakers) and the
respective power amplifier channel. The
silent test may also be initiated by a
remote command.
The results of a silent test are presented
on the LED displays, on the front panel,
as shown in the table. Speakers less
than 60 Watts may not indicate
correctly.
J6
J3
J4
J5
J1
F1
J2
SW1
TB2
TB1
TB3
3 AMP
PC. BD #67729
.325 CENTERS
.250 CENTERS
SPEAKER AUDIO 1+
SPEAKER AUDIO 1-
SPEAKER AUDIO 2-
SPEAKER AUDIO 2+
SPEAKER AUDIO 4+
SPEAKER AUDIO 4-
SPEAKER AUDIO 3-
SPEAKER AUDIO 3+
SPEAKER AUDIO 7+
SPEAKER AUDIO 7-
SPEAKER AUDIO 8-
SPEAKER AUDIO 8+
SPEAKER AUDIO 6+
SPEAKER AUDIO 6-
SPEAKER AUDIO 5-
SPEAKER AUDIO 5+
SHIELD GROUNDS

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Silent Test LED Indicators
LED STATUS INFORMATION COLOR
AC On AC site power Red
DC On DC power > 19 VDC Red
PART On Partial Speaker Driver/Amplifier Operation Red
FULL On Full Speaker Driver/Amplifier Red
The diagnostic routine of the IPS is processed for each inaudible or full power activation of the system, and the
diagnostic LED indicators represent the results of the most current activation.
The complete results of the inaudible test are collected and encoded by the ESC-864 PC board for transmission back to
the central control point. In addition to the status information mentioned in the table, the ESC-864 also reports the
following information via its RF or landline communication link.
•DC Voltage (system battery voltage)
•AC Voltage
•Ambient Temperature, a 2-digit representation
•Receiver Link S/N , a 2-digit representation
•Activation Count
If all of the SI TEST® LED indicators are illuminated following a test, then all diagnostic routines have been
successfullycompleted, verifying proper station operation. The LED displayof the IPS maybe programmed to remain on
until cleared, or to extinguish after a predetermined time period.
4.3.3 Power Saving Logic
The system driver board also features a power saving device. In the event of a loss of incoming power from an AC
source, the system will power itself down after thirty (30) seconds to conserve the batteries by using less energy for
standby operation. When AC is restored, the IPS automatically reverts to full power-up mode and the battery charger re-
charges the batteries.
4.3.4 DC Voltage Regulator
The system driver board produces 12 volts DC, from the 24 VDC supply, to power the ESC-864 PC board and the
optional radio. A 3 amp fuse is in line with the 12 volt DC supply.
4.4 Battery Charger Operation
The battery charger has the primary function of maintaining the system battery supply to full capacity. The battery
charger provides 5 Amps of charging current to the batteries. The operational status of the battery charger can be viewed
bythe DC LED during warning signal tone, activation of the SI TEST®, or when the system is powered up. In addition,
a green LED on the charger, indicates proper charging. To maintain optimum battery capacity, the IPS should be
exercised on a frequent basis using SI TEST® and full-power activations.
4.5 Batteries
The batteries are located in the lower compartment of the IPS. Two 12 VDC, 31 AH Gel type batteries are required to
operate an IPS-400, while two 12 VDC 55 AH batteries are required to operate an IPS-800. Detailed installation
information for the batteries is provided in Section 5.

15
Section 5INSTALLATION
5.0 Installation Instructions
The installation instructions are presented as follows:
Site Selection
Receiving/Unpacking the IPS
Installation of the IPS Cabinet
Conduit Openings for the IPS Cabinet
AC Wiring
Speaker Wiring
These steps are discussed in detail in this section. Once the installation steps are complete, the IPS is ready for an
operational checkout.
5.1 Site Selection
Selecting the site for an IPS requires careful planning to achieve optimal use, range, and effect of the system. Consider
maintenance and future expansion when selecting a cabinet mounting location.
Typically, a two conductor, 18 AWG cable is run.
The cabinet has mounting tabs or flanges on 14 inch centers, for wall mounting. For outdoor applications, drain holes
need to be drilled into the upper compartment of the IPS. Consult Whelen Engineering Company, Inc. for advice on
outdoor applications.
NOTE
As part of the site selection planning process, the local utility company should be consulted with respect to
installation of AC service. The location of the IPS site should be checked for the quality of the AC service
and to ensure there will be no electromagnetic interference at the site. Also, AC power sources subject to
excessive power surges or transients are not acceptable. A site should also be appraised for antenna
placement and for radio reception for systems equipped with RF link interfaces.

16
R
IPS
SYSTEM
100 WATT
SPEAKER
60 WATT
SPEAKER
3 - 30 WATT
SPEAKERS
4 - 15 WATT
SPEAKERS
= SPEAKER AUDIO (2 CONDUCTORS)
CAUTION
In planning for speaker arrangement and placement, the use of hearing-protective devices should be
considered for people working in close proximity to heavy-duty speakers connected to the IPS.