RDSO SPECIFICATION OF PUBLIC ADDRESS …...RDSO/ SPN specification is issued as draft specification. This specification is circulated to customers/ railways and field inspection units

Page 1 of 25 Effective from 07/07/2008 RDSO/SPN/TC/78/2008 Rev. 0

RDSO SPECIFICATION

OF

PUBLIC ADDRESS SYSTEM FOR PASSENGER TRAINS

SPECIFICATION NO RDSO/SPN/TC/78/2008

Revision 0.0

Number of Pages: 25

TELECOM DIRECTORATE

RESEARCH DESIGNS & STANDARDS ORGANISATION

LUCKNOW-226011


DOCUMENT DATA SHEET

Specification

RDSO/SPN/TC/78/2008

Revision

0.0

Title of Document

RDSO Specification of Public Address System for Passenger Trains

Author

Director/ Telecom-II/ RDSO

Approved by

Executive Director/ Telecom/ RDSO

Abstract

This document specifies technical specification of Public Address System for Passenger Trains.


DOCUMENT CONTROL SHEET

NAME

ORGANIZATION

FUNCTION

LEVEL

Director/ Telecom-II

RDSO

Member

Prepare

Executive Director/ Telecom

RDSO -

Approve

REVISIONS:

Version Chapter/ Annexure

Revision Effective Month/Year

RDSO/SPN/TC/78/2008 - FIRST ISSUE July 2008


TABLE OF CONTENTS

Sr. No. Item Page No.

1.0 Scope

6

2.0 System Description

6

3.0 General Requirements

6

4.0 Technical Requirements

7

5.0 Cables & Wiring Accessories

11

6.0 Tests & Requirements

13

7.0 Test Procedure

15

8.0 Quality Assurance

20

9.0 Making and Packing

21

10.0 Information to be supplied by the Manufacturer

21

11.0 Information to be supplied by the Purchaser

21

12.0

Installation Practices 22

13.0 Training

22

14.0 Diagrams

22

15.0 Diagram -1

23

16.0 Diagram – 2

24

17.0 Diagram – 3

25


I. SUMMARY:

This document covers the technical requirements of Public Address System for Passenger Trains to be provided inside coaches of trains for making announcement to passengers.

II. SOURCE:

Draft specification RDSO/ SPN/ TC/ 78/2008, Rev.0 has been prepared by RDSO, Lucknow as per Railway Board letter No. 2006/Tele/TC/1 dated 12/05/2008.

III. FOREWORD:

RDSO/ SPN specification is issued as draft specification. This specification is circulated to customers/ railways and field inspection units for comments. In the absence of IRS specification, procurement may be made as per RDSO/ SPN specification.

This specification requires the reference to the following specifications:

RDSO/SPN/144 The Safety and reliability requirement of electronic signaling equipment

IS:9000 Basic environmental testing procedures for electronic and electrical items

Wherever, reference to any specifications appears in this document, it shall be taken as a reference to the latest version of that specification unless the year of issue of the specification is specifically stated.

.


RESEARCH DESIGNS & STANDARDS ORGANISATION MINISTRY OF RAILWAYS

MANAK NAGAR, LUCKNOW

Draft Specification for Public Address System for Passenger Trains

Draft Specification No. RDSO/SPN/TC/78/2008, Revision 0.0

1.0 SCOPE:

The specification of Public Address System for Passenger Trains covers technical requirement of Microphone, Amplifier, Cassette Recorder, Speaker and other miscellaneous items used for making announcements and playing music inside coaches of passenger trains.

2.0 SYSTEM DESCRIPTION:

The Public Address System for Passenger Trains shall consist of Microphone, Amplifiers with inbuilt USB Reader, Cassette Player, appropriate number of speakers, cables, and other accessories. Prerecorded messages and / or prerecorded music will be played through the USB Reader fitted in the amplifier. Cassette Player will be used for playing pre-recorded cassettes (for music or announcements). This will be connected to the Amplifiers.

The various speakers in a coach shall be wired in such a way that half of them are connected to one amplifier, and the other half to the other amplifier.

The Microphone shall be used for making special announcements which are not pre-recorded.

Schematic diagrams of the various elements of the system, and their interconnections have been shown in Diagram 1& 2.

3.0 GENERAL REQUIREMENTS:

3.1 Original Equipment Manufacturer of Public Address System shall have base and service support in India, either directly or through authorized agents / dealers / distributors.

3.2 Screened cable & shielded wires shall be used for signal transmission

between different elements of the Public Address System to avoid effect of 25 KV, 50 Hz AC traction and other type of interferences.


3.3 All the equipments for PA system shall be designed such that their

performance is not affected by 25 KA, 50 Hz AC traction or 1500 Volts DC traction.

3.4 The PA system shall be so designed as to work the farthest loudspeakers

satisfactorily. 3.5 Separate standard cabinet of suitable dimension is to be provided in one

of the designated coach to house all type of devices and equipments required for PA system and other accessories.

3.6 Cabinet frame should be made of heavy grade aluminium profiles

designed to accept front and rear doors within the frame itself. The support profiles for equipment mounting should be independent of the main vertical profiles and can be located within the cabinet. The side panels and rear door should be of CRCA sheets with louvers for ventilation. The front door should be of tinted toughened glass or perspex. Power supply distribution box with required number of sockets of adequate rating shall be provided in the cabinet. The frame should have an easy assembly system to ensure on-site assembly. Detailed construction diagram of cabinet is to be got approved by RDSO.

3.7 The front and back sides of the cabinets shall have the facility for locking

the equipment. Gland plates shall be provided on the top and bottom panel of cabinet for cable entry. Proper cable guides are also to be provided inside cabinet. Suitable ventilation should be provided from both sides and rear of cabinet such that possibility of dust accumulation inside the cabinet is minimized.

4.0 TECHNICAL REQUIREMENTS:

The various elements of the Public Address System for Passenger Trains shall be mainly followings:

4.1 Microphone:

4.1.1 The microphone shall have a dynamic unidirectional cartridge with

following characteristics:

(a). Output level between 2 and 2.5mV / Pascal sound pressure; (b). Frequency response at least 100Hz - 10,000Hz; (c). Impedance 600 ohm ± 20%, at 1 KHz.

4.1.2 The microphone shall have a flexible metal gooseneck mounted securely on an aluminium diecast base.


4.1.3 The flexible portion of the gooseneck shall have a length of 150 mm or

more. 4.1.4 The aluminium diecast base of the microphone shall have two holes for

mounting the base to a table or wall. 4.1.5 The microphone shall be provided with an arrangement for switching it ON

and OFF. 4.1.6 The microphone shall have an audio output through a permanently fixed

cable of minimum length 3000 mm. The cable shall have a 3 pin MXLR connector at one end for connecting it to an amplifier.

4.2. Amplifier: 4.2.1 The amplifier shall operate on 110V DC power supply. A terminal strip or

suitable connector shall be provided on the rear panel of the amplifier to which the 110V supply can be connected.

4.2.2 The amplifier shall be capable of giving an output of 500 watts at 5% total

harmonic distortion. 4.2.3 The amplifier shall have an inbuilt output transformer with 100V and 70V

output taps for connecting speakers with line matching transformer. 4.2.4 The 100V and 70V outputs along with common contact shall be provided

on a suitable terminal strip on the rear panel of the amplifier. 4.2.5 A balanced line output shall be provided through a 3 pin MXLR connector

on the rear panel of the amplifier. Its nominal output level shall be 1V RMS.

4.2.6 An unbalanced preamplifier output shall be provided through a 6.25mm

phone jack on the rear panel of the amplifier. Its nominal output shall be 200mV RMS.

4.2.7 A balanced mic input shall be provided through a 3 pin FXLR connector on

the rear panel of the amplifier. Its nominal sensitivity shall be 1mV.

4.2.8 Atleast two balanced AUX inputs shall be provided through a 3 pin

FXLR socket on the rear panel of the amplifier. Its nominal

sensitivity shall be 200mV. 4.2.9 A balanced line input shall be provided through a 3 pin FXLR connector on

the rear panel of the amplifier. Its nominal sensitivity shall be 1V.


4.2.10 The gain of the MIC and AUX inputs shall be individually adjustable

through level control potentiometers provided on the front panel of the amplifier.

4.2.11 A MASTER control potentiometer shall be provided on the front panel of

the amplifier for adjusting the audio power output. 4.2.12 The MIC input shall have automatic priority over the AUX input/ input from

USB Reader, i.e. any signal being fed into the AUX input or through USB Reader shall be automatically attenuated by at least 20dB when an audio signal (matching the sensitivity of the MIC input) appears on the MIC input.

4.2.13 A BASS control potentiometer shall be provided on the front panel such

that bass attenuation of at least 10dB (at 100Hz) can be achieved by adjusting it.

4.2.14 A TREBLE control potentiometer shall be provided on the front panel of

the amplifier such that treble attenuation of at least 10 dB (at 10 Kilo Hertz), as well as treble boost of at least 5dB (at 10 Kilo Hertz) can be achieved by adjusting it.

4.2.15 Suitable indication of output signal level shall be provided on the front

panel through a LED, or LED array, or any other suitable means. 4.2.16 Suitable protection circuit or device shall be provided for protection of the

amplifier against accidental short circuit and overloading. 4.2.17 Suitable thermal protection shall be provided inside the amplifier for

protecting the amplifier against overheating. 4.2.18 The Amplifier shall have a frequency response of at least 80 - 12000Hz

(±3dB), measured at 100W, when the BASS & TREBLE controls are at flat (0dB) position.

4.2.19 The Amplifier chassis shall be suitable for mounting on a rack, or else

suitable brackets / clamps shall be provided which enable the amplifier to be mounted on a rack.

4.2.20 The amplifier shall have an inbuilt USB Reader for playback of

prerecorded music and / or prerecorded messages through a USB port. 4.2.21 The Amplifier shall be compliant with safety standard IEC-60065.


4.3 Cassette Player:

4.3.1 The Cassette Player shall be capable of playing back standard compact

cassettes meant for 4.76 cm/ sec speed.

4.3.2 The Cassette Player shall operate on 110V DC power supply. A terminal strip or terminal posts shall be provided on the rear panel of the amplifier to which the 110V supply can be connected.

4.3.3 The Cassette Player shall have a mono audio output of level 200mV,

±20% (measured with a standard -10dB cassette at 1KHz, with level control at full). Balanced audio output shall be available on a 3 pin MXLR socket on the rear panel of the Cassette Player.

4.3.4 A balanced mic input shall be provided through a 3 pin FXLR socket on

the rear panel of the Cassette Recorder. Its nominal sensitivity shall be 1mV.

4.3.5 A balanced AUX input shall be provided through a 3 pin FXLR socket on

the rear panel of the Cassette Player. Its sensitivity shall be 200mV, ±20%.

4.3.6 Suitable level control potentiometer (or potentiometers) shall be provided

on the front panel for adjusting the level of the recording and playback. 4.3.7 An indication of the audio signal level during recording and playback shall

be provided on the front panel through a LED, or LED array, or any other suitable means.

4.3.8 A 6.25mm phone jack shall be provided on the front panel for connection

of an 8 ohm headphone for monitoring the audio signal. 4.3.9 The Cassette Player shall be compliant with safety standard IEC-60065. 4.4 Speaker Assembly: 4.4.1 The Speaker Assembly shall consist of a Metal Cabinet with a paper cone

Speaker, Line Matching Transformer and Attenuator mounted securely inside it.

4.4.2 The Metal Cabinet shall have holes for mounting it securely against a wall

or ceiling. 4.4.3 The Metal Cabinet shall have a powder painted surface finish.


4.4.4 The Metal Cabinet shall have a hole or holes suitable for connecting wires

to enter and exit. Connection to external wiring shall be made on a terminal block or terminal strip inside the Metal Cabinet.

4.4.5 The Speaker shall be of size 150 x 100mm (±5%), and shall be capable of

withstanding a power input of 6W RMS. 4.4.6 The Speaker shall give a sound pressure output of minimum 88dB at

1KHz when a power of 1 Watt is applied across its terminals. It shall give an output of minimum 82dB at all frequencies between 150 Hz and 10 KHz when a power of 1 Watt is applied across its terminals. All sound pressure levels shall be measured at 1 meter distance, with reference to 20 micro pascal sound pressure.

4.4.7 The Line Matching Transformer shall be suitable for connecting the

speaker to the 100V output terminals of the Amplifier, and shall be of minimum 6 watts rating.

4.4.8 The Metal Cabinet shall be fitted with a switch or potentiometer

(Attenuator) which can switch OFF the audio output of that speaker, or attenuate it continuously or in multiple steps. The switch or potentiometer shall be accessible from outside the Metal Cabinet.

4.4.9 The impedance of the Speaker Assembly shall be 1660 ohms (±20%) at

1KHz, with the Attenuator at full (no attenuation). The impedance shall not be less than this at any setting of the attenuator.

5. CABLES AND WIRING ACCESSORIES:

5.1 Loudspeaker Cable: 5.1.1 The loudspeaker cables connected from power amplifiers to the

loudspeakers through plugs & sockets, terminal blocks etc. shall be either 4 core or 2 core depending upon requirements.

5.1.2 Loudspeaker cable shall be Aluminum Polyester shielded, Polythene

insulated, PVC sheathed to be used for wiring in coaches to avoid EMI interferences.

5.1.3 Each core (conductor) shall be of size 1.5 sq. mm having 48 strands of 0.2mm of annealed tinned high conductivity copper as per specification IS: 694-1990 (with latest amendments/revisions, if any)..

5.1.4 Tinned conductor shall be covered with polythene. The radial thickness of

the insulation shall be 0.6mm. The colour of the cores of four core cable shall be Red, Yellow, Blue and Green. The colours of cores of one of the


two core cable shall be Red & Green and in another two core cable shall be Blue and Yellow.

5.1.5 Protective PVC jackets shall be provided as sheath. The radial thickness

of sheath shall be 0.9mm. Colour of sheath shall be grey.

i) Overall diameter of the cable shall not exceed 12mm. ii) DC resistance of the conductor shall not exceed 13.70 ohms per Kilometer at 200 C.

iii) Nominal capacitance value between one conductor with all other conductor connected to the shield shall not exceed 131 pf/meter.

5.1.6 The cores shall be formed and laid. All the cores after laying shall be shielded using Aluminium polyester tape. Shield coverage shall be 100%.

5.2 Plugs and Sockets:

5.2.1 The plugs and sockets for interconnection between different coaches shall

be of industrial grade type with spring loaded butt type contacts. 5.2.2 These shall be suitable for outdoor applications under conditions of high

vibrations. The plugs and sockets shall be dust proof, weather proof, water proof and vibration proof as per IP674.

5.2.3 The plug shall not be able to be pulled out of its socket by its cable or fall

on its own. Appropriate locking mechanism shall be provided to ensure this.

5.2.4 The plug and sockets shall have 5 pins with following rating:

i). Rated Voltage: 500V AC & DC ii). Contact Resistance: Less than 1 milliohm iii). Mechanical & Electrical Life: 10000 operations

5.3 Termination Block:

5.3.1 Terminal block, mounted inside the coach for terminating loudspeaker cables should have the following broad specifications:

i). Nos. of conductor terminals: 4 ii). Nos. of Poles: 8 iii). Cross section range of conductor: 0.08 sq. mm to 4 sq. mm iv). Connection method: Cage Clamp v). Current Rating: 32A vi). Wiring type: Side entry


5.4 Inter - Coach Flexible Conduit:

5.4.1 The loudspeaker cable or any other audio cable shall run from one coach

to another in a flexible conduit. 5.4.2 The flexible conduit shall be of high-grade specially formulated polyamide

suitable for external applications in railway vehicles. It should have following characteristics:

i). Very good resistance to ultra violet rays and weathering. ii). Good flexibility. iii). High mechanical strength under adverse weather conditions. iv). Self extinguishing. v). Free from cadmiums and halogens. vi). The outer diameter of the flexible conduit should be 21mm ± 2mm

and inner diameter 15mm ± 2mm. vii). End fitting for the conduit to be pg 16 along with hexagonal locknut

with pg thread. 5.5 Power Cable:

5.5.1 4 sq. mm copper PVC sheathed cable as per IS: 694-1990 (with latest

amendments/revisions, if any) shall be provided in SLR/Pantry Coaches to provide 110 V DC supply to PA amplifiers and cassette player.

6.0 TESTS AND REQUIREMENTS:

6.1 Conditions of Tests:

6.1.1 Unless otherwise specified all tests shall be carried out at ambient

atmospheric conditions.

6.1.2 For inspection of material, relevant clauses of RDSO/SPN/144 shall apply.

6.1.3 Inspection and testing shall be carried out to the effect that all requirements

of this specification are complied with. 6.2 Type Tests:

6.2.1 For type test, one complete system consisting of all type of devices &

equipments as per specification mentioned in clause 2 to 5 and wired as per diagrams 1 & 2 shall be subjected to following tests as applicable:

a) Visual inspection (Clause 7.1)


b) Insulation Resistance Test (Clause 7.2) c) Applied High Voltage Test (Clause 7.3) d) Environmental/ Climate Tests (Clause 7.4) e) Performance Test (Clause 7.5) f) Endurance Test (Clause 7.6.1) g) Card-level & module level functional tests on all the cards. h) System level functional tests.

6.2.2 Following systems shall be submitted to RDSO after type approval.

a) Microphone – 1 no. b) Amplifier – 1 no. c) Cassette Recorder – 1no. d) Speaker Assembly – 4 nos.

e) Cables and Wiring Accessories – 1 set f) Cabinet – 1 no. 6.2.3 Only one complete system shall be tested for this purpose. The system shall

successfully pass all the type tests for proving conformity with this specification. If any one of the equipment fails in any of the type tests, the purchaser or his nominee at his discretion, may call for another equipment/card(s) of the same type and subject it to all tests or the test(s) in which failure occurred.

6.2.4 Following tests are to be conducted on Loudspeaker Cable. 6.2.4.1 High Voltage Test: The cable shall withstand in the dry state an AC

voltage of 1500V RMS as per IS:694-1990 (with latest amendments/revisions, if any).

6.2.4.2 Insulation Resistance Test: The value of insulation resistance for

polythene insulation shall be 1013 ohm-cm (minimum) at 270 C. Insulation resistance for PVC sheath shall meet the requirements of the insulation resistance as per the test specified in IS:694-1990 with latest amendments/revisions, if any).

6.2.4.3 Flammability Test: This test shall be conducted as per IS: 10810

(Pt-53) latest. 6.3 Acceptance Tests: 6.3.1 The following shall constitute the acceptance tests which shall be carried

out by the inspecting authority for the purpose of acceptance on 20% of the lots (minimum 2 each type of system) offered for inspection by the supplier:

a) Visual inspection of complete system (Clause 7.1)


b) Insulation Resistance Test (Clause 7.2)

c) Performance Test (Clause 7.5) d) Endurance Test (Clause 7.6.2) d) System level functional tests.

6.4 Routine Tests: 6.4.1 The following shall comprise the routine tests and shall be conducted by

manufacturer on every equipment and the test results will be submitted to the inspection authority before inspection. The application software, if applicable, in proper format shall also be submitted to the inspection authority in advance.

a) Visual inspection of complete system (Clause 7.1)

b) Insulation Resistance Tests (Clause 7.2) c) Performance test (Clause 7.5) d) Card-level & module level functional tests on all the cards/ modules. e) System level functional tests.

7.0 TEST PROCEDURE:

The test procedure shall be based on the system design. The methodologies to be adopted for various tests shall be decided taking into account the system design/configuration.

7.1 Visual Inspection: 7.1.1 All equipment shall be visually inspected to satisfy general requirements,

construction and marking. 7.1.2 All the metal parts shall be suitably painted / coated / plated and shall be

protected against rust and corrosion. 7.1.3 All modules and printed circuit boards shall be easily accessible (by opening

suitable screws) for maintenance. 7.1.4 All components on the PCB shall be rigidly fixed and shall withstand normal

shock and vibrations. 7.1.5 Mounting of switches, knobs, push buttons, LEDs, lamp indicators, meters,

terminals, and other external components shall be easy for operation, adjustment and maintenance.

7.1.6 Arrangement for adequate ventilation of all heat radiating components shall

be provided.


7.1.7 Each equipment of the system shall be visually inspected to ensure

compliance with the requirement of clauses 2 to 5 of this specification. The visual inspection shall broadly include:

(i). System Level Checking:

Constructional details. Dimensional check. General workmanship. Mounting of cards.

(ii). Card Level Checking:

General track layout. Quality of soldering and component mounting. Legend printing. Green masking.

(iii). Module Level Checking:

General shielding arrangement of individual cards, if applicable. Indications and displays, if applicable. Mounting of connectors. Proper housing of cards.

7.2 Insulation Resistance Test: This test shall be carried out –

(a) Before the high voltage test (b) After the high voltage test (c) After completion of the climatic test There shall be no appreciable change (value more than 10 Mega ohms and variation within 10%) in the values measured before and after high voltage test. After the completion of climatic test, the values shall not be less than 10 Mega ohms for the equipment at a temperature of 400 C and relative humidity 60%. The measurement shall be made at a potential of 500V DC.

7.3 Applied High Voltage Test: The equipment shall withstand for one

minute without puncture and arcing a test voltage of 2000 volts rms applied between:

(a) AC line terminals and earth (b) DC line terminals and earth


The test voltage shall be alternating of approximately sinusoidal waveform of any frequency between 50 Hz. and 100 Hz. Printed circuit cards shall be removed.

7.4 Environmental/ Climate Tests:

7.4.1 The public address system for passenger trains shall be capable of working in non-air conditioned environment inside the coaches of trains running up to speed of 200 KMPH.

7.4.2 The public address system for passenger trains shall be suitable for

working on AC/ DC electrified and non-electrified sections. It shall be suitable in all areas including where locomotives having thyristor controlled single phase or 3-phase induction motors haul passenger or freight trains and where chopper controlled EMU stocks are operated.

7.4.3 The public address system for passenger trains shall meet the following

climatic and environmental requirements:

SN TEST REFERENCE

1. Change of temp test IS 9000 Part XIV Sect. II

Low temp –10o C ± 3o C

High temp +70o C ± 2o C

Rate of change in temperature

1o C / min

Duration 7hrs at each temp. –10 o C & +70 o C

Cycle 3

Condition Fully functional during test

2. Dry heat test IEC-571; IS:9000 Part-III Sect 3 Temp +70oC ± 2o C

Duration 16 hrs

Condition Fully functional during test

3. Cold test IS 9000 Part II Sect. III

Temp –10o C ± 3 o C

Duration 2 hours

Condition Fully functional during test.


4. Damp heat test (Cyclic) IS 9000 Part V Sect. 2 Variant 1

Upper temp 40o C ± 2 o C

Humidity 95% (+1%, -5%)

Cycles 6

Condition Fully functional during one hour period towards end of each cycle. Stabilization shall be done at 25o ± 3 o C

5. Damp heat test (Steady state storage) IS 9000 Part IV

Temp 40o ± 2 o C

Humidity 93% (+2%, -3%)

Severity 4 days

Condition Fully functional during test.

6. Salt mist test IS 9000 Part XI procedure 3 Mist + Damp heat Procedure 3: 2 hours + 22 hours

Temp 35o ± 3 o C

Humidity 93% (+2%, -3%)

Hours 22

Cycle 3

Condition After this test, electrical parameters shall be monitored in addition to physical checks.

7. Dust test IS 9000 Part XII

Duration 1hour


8. Bump test IS 9000 Part VII, Sec. 2

PCBs/Modules/units in packed condition shall be subjected to bump test as under:

No of bumps 1000

Peak acceleration 400 m/s2

Pulse duration 6 ms

No of axes 3


9. Vibration test TEC (IPT 1001A-revised)


Up to & including 75 Kgs. weight

Over 75 Kgs.

Freq. Range 05-350 Hz 5-150 Hz

Amplitude ± 6 mm constant displacement or 15m/ Sec.2 constant acceleration.

± 6 mm constant displacement or 15m/ Sec.2 constant acceleration.

No. of axes 3 3

No of sweep cycle

20 10

Total duration 105 min 105 min

If resonance is observed

10 min at each resonant freq.

10 min at each resonant freq.


10. Environmental Stress Screening tests (ESS) for Printed Circuit Boards (PCB) & sub systems:

(The manufacturer shall carry out the following ESS tests on all modules on 100% basis during production / testing in the sequence as follows. Suitable records shall be maintained regarding the compliance of these tests. )

10.1 Thermal cycling: The PCBs shall be subjected to thermal cycling as per the procedure given below. The assembled boards are to be subjected to rapid temperature cycling as mentioned below in the power off condition.

This temperature cycling from 0° C to 700C, ½ Hours at each temperature for 9 cycles and 1 hour at each temp. for the 10th cycle. Dwell time of 1 hour is provided for the last cycle in order to oxidize defective solder joints exposed through thermal stress.


70° C, ½ Hour 1 Hour Ambient r 0° C, ½ Hour The rate of rise / fall of temp. shall be minimum 10° C per

minute. In addition to physical checks, the electrical parameters are

also to be monitored after this test.

10.2 Power cycling: The power supply modules shall be subjected to 60 ON-OFF cycles for 1 hour. The ON-OFF switch usually provided in the modules may not be used for this purpose.

7.5 Performance Test: The equipment shall comply with the requirements as

specified in Clauses 2 to 5. 7.6 Endurance Test:

7.6.1 During type test, endurance test shall be conducted on complete system

mentioned in Clause 6.2.3 for continuous operation which shall be 168 hours at 600C temperature without giving any deterioration in the performance of equipment.

7.6.2 During acceptance test, endurance test shall be conducted on samples as

per Clause 6.3.1 for continuous operation which shall be 48 hours at room temperature without giving any deterioration in the performance of equipment.

8. QUALITY ASSURANCE:

8.1 All materials & workmanship shall be of good quality. 8.2 Since the quality of the equipment bears a direct relationship to the

manufacturing process and the environment under which it is manufactured, the manufacturer shall ensure Quality Assurance Program of adequate standard.

8.3 Validation and system of monitoring of QA (Quality Assurance) procedure

shall form a part of type approval. The necessary plants, machineries and testing equipments required for production & quality assurance as per Scheduling of Technical Requirements (STR) shall be available with the manufacturer.


9. MARKING & PACKING: 9.1 The following information shall be clearly marked at a suitable place on

each equipment:

i) Name and Address of the manufacturer. ii) Year of the manufacturer. iii) Serial number of Equipment iv) Specification number v) Schematic diagram of the equipment on the side of the cover.

9.2 The equipment and its sub assemblies shall be wrapped with polythene or

bubble sheet and packed in suitable boxes of sufficient strength so that it can withstand bumps and jerks encountered in a road/rail journey.

10. INFORMATION TO BE SUPPLIED BY THE MANUFACTURER: 10.1 The following documents in two sets should be supplied along with the

system:

i) Mechanical drawings of each sub system/ equipment. ii) Installation and maintenance manual incorporating trouble shooting

exercises, printed cards patterns, software etc. iii) Operating and trouble shooting manual. iv) Pre-commissioning check list.

11. INFORMATION TO BE SUPPLIED BY THE PURCHASER:

11.1 The purchaser should clearly indicate details of required items which shall

mainly consist of following items as per requirement.

S.No Description of the Item Quantity

1 Microphones As per requirement

2 Amplifiers As per requirement

3 Cassette Players As per requirement

4 Speaker Assemblies As per requirement

5 Cables for wiring from amplifiers to speakers

As per requirement

6 Plugs & Sockets As per requirement

7 Terminal Blocks As per requirement

8 Polyamide Flexible Conduit As per requirement


12.0 INSTALLATION PRACTICES:

12.1 The installed equipment will be operating in extreme conditions of vibration up to 200 KMPH speed of trains. Therefore the best engineering practices are to be adopted during the installation of various equipment as specified by purchaser to make the entire sound system immune to vibrations.

12.2 Sufficient precautions are to be taken while installing speakers inside

coaches and other equipment exposed to make them temper and pilfer proof as much extent as possible. Adequate anti-theft measures are to be taken to avoid theft of these equipments.

13.0 TRAINING: 13.1 On site training shall be provided to the Railway staff which shall include

complete assembly of the system through the use of various individual equipment, integration of hardware with software (if applicable), and complete operation of the system.

13.2 Sets of operating / instruction manual in two hard copies and two soft

copies containing details of technical specifications, installation and commissioning guidance, trouble shooting & maintenance schedule (if applicable) shall be supplied along with the equipment.

14.0 DIAGRAMS:

Following schematic diagrams have been shown for wiring of Public Address System for Passenger Trains. Detailed diagrams of wirings of PA system inside coaches and from one coach to another along with mounting & fixing diagrams of all equipments of PA system are be approved by RDSO and Railways.

14.1 Diagram -1: Interconnection Diagram of PA System for Pantry/ SLR coaches of trains

14.2 Diagram- 2: Interconnection Diagram of PA System inside coaches of trains.

14.3 Diagram - 3: Interconnection Diagram of loudspeaker cable between

two consecutive coaches of train.




WIRING ARRANGEMENT BETWEEN TWO COACHES ALONG WITH PLUG & SOCKET

DIAGRAM - 3

Documents

RDSO SPECIFICATION OF PUBLIC ADDRESS …...RDSO/ SPN specification is issued as draft specification. This specification is circulated to customers/ railways and field inspection units