CSEE Installation Manual Updated Part 1
Contents
1. Figure 15 electrical analogy at the frequency F1 At frequency F1 impedance Z1 is capacitive It represents the pole impedance of TU F1 with the track connecting cables Z1 Z cable Z TU F1 pole impedance Z2 is inductive It includes the impedances of the ACI and connecting cables Z2 Z ACI Z cables Impedance 23 very low takes account of the TU F2 zero impedance as well as the track connecting cables Z3 Z TU F2 zero Z cables Important The zero impedance of TU F2 slightly capacitive compensates the track connection cables inductance Thus as seen from the track 73 represents an actual impedance close to a short circuit a few milliohms only This very low impedance depends on the length and the positionning of the cables CTRISPS GML 95 40 323 1 2 Bes CS Transport Communication reproduction interdites Copyright and all other rights reserved r Ay TRANSPORT z pee pee Impedances ZA and Z5 represent the track impedance making up a half ESJ ZA Z5 RxV2 I Lxl 2xo As seen from TU F1 Z2 Z3 ZA and Z5 represent the following equivalent inductive impedance Q3 Z5 xZ2 Z4 d Z2 Z3 Z5 This impedance coupled in parallel to capacitive impedance Z1 makes a trap circuit which determines the impedance of the ESJ at frequency F1 Z x Zl v METODI Pis JES Z Z eq The short circuit presented by Z3 prohibits the propagat2. ay TRANSPORT PUBLIC TRANSPORT CORPORATION MELBOURNE INSTALLATION MANUAL UM71 TRACK CIRCUIT CS Transport Communication reproduction interdites Copyright and all other rights reserved S TRANSPORT DOCUMENT HISTORY 24 02 95 Document creation 10 08 95 Up Date CTRSPS GMLeSA033 1 2 me2 CS Transport Communication reproduction interdites Copyright and all other rights reserved e Ay TRANSPORT CONTENTS 1 PURPOSE OF THE DOCUMENT sesseeee eA 12 2 GENERAD 24 6253 ee ieee Ra a a od buc Aaa 13 2 1 Purpose of the UM 71 track circuit 000000000 13 2 2 Configurations of the UM 71 track circuit llle 14 2 3 Track circuit termination ee ees 16 2 4 Intermediate data collector IDC 0 0 0 ce ees 17 2 4 1 Intermediate data collector in voltage IP 4 17 2 4 3 Intermediate data collector in cument PPD 19 2 5 Use of the UM 71 track circuit in points 00 4 20 3 UM71 TRACK CIRCUIT CARACTERISTICS ess 21 3 1 Design parameters 20299 o PAS RRe RR RA 21 32 Ballast resistance eee RII 22 3 3 Theoritical drop shunt oneen aaa 23 3 4 Maximum and minimum track circuits length 24 3 5 Maximum li le n PD equiments and transmitte VEE sched amp find ooo ea C ee e dud iid tee A WT eae 25 3 6 Broken rail detection
3. Configuration Single MU Configuration Double MU APPENDIX 9 TERMINATION ON INSULATED RAIL JOINTS IRJ Configuration with return traction current 200Amps Configuration with return traction current gt 200Amps APPENDIX 10 INTERMEDIATE TRANSMISSION IT Configuration APPENDIX 11 INTERMEDIATE DATA COLLECTOR IDC Configuration Information point IP op emsoss T2 ISTALLATEN MANUAL ms ET CS Transport Communication reproduction interdites Copyright and all other rights reserved C hy TRANSPORT Pin Point Detector PPD APPENDIX 12 AIR CORE INDUCTOR ACI Presentation and measurements APPENDIX 13 TUNING UNIT TU Presentation and measurements APPENDIX 14 PIN POINT DETECTOR PPD Presentation and measurements APPENDIX 15 MATCHING UNIT MU Presentation and measurements Single MU Presentation and measurements Double MU APPENDIX 16 COMPENSATION CAPACITOR Presentation and measurements APPENDIX 17 UM71 TRANSMITTER Presentation and coding Support panel with fixed parts of connectors coding for transmitter 1700Hz coding for transmitter 2000Hz coding for transmitter 2300Hz coding for transmitter 2600Hz APPENDIX 18 UM71 RECEIVER Presentation and coding Support panel with fixed parts of connectors CTR SPSIGMLSS40323 1 2 o mes ee Q CS Transport Communication reproduction interdites Copyright and all other rights
4. CS Transport Communication reproduction interdites Copyright and all other rights reserved c ay TRANSPORT 4 8 2 2 principle fig 22 TRACK CIRCUIT transmitter ES Boosting unit 1 current rail pH M Pin point d tector LOCO unit LJ Matching Unit Reception line Figure 22 principle Pin Point Detector The signalisation current in the rail is measured with a PPD Unit The PPD unit is composed with an inductive device tuned to Track Circuit frequency The PPD Unit is located next to the rail The rail current is transmitted per induction to the PPD unit The voltage measured at the PPD Unit supplies through an adjustment resistor the receiver input The PPD Unit output depends directly on the amount of the track circuit current flowing in the rails The use is strictly limited to the following minimum current values 570mA for a 1700Hz track circuit 520mA for a 2000Hz track circuit 485mA for a 2300Hz track circuit 470mA for a 2600Hz track circuit A Boosting Unit device can increase the current value in the rail in order to respect the minimum value described above The Boosting Unit is composed of a 10 ohms 10W resistance protected from DC current by two electrolytic capacitors 2 100uF head to tail mounted It is installed between rails o Emmumn o UEM INSTALLATION NONE aT T CS Transport Communication reproduction interdites Copyright and all
5. A resistor NTC Negative Temperature Coefficient located in the transistor base emitter circuit provides temperature stability for the stage Trap circuit selectivity Trap circuit Output signal Figure 5 Demodulation principle T emsoss T PELA MANE s TT Q CS Transport Communication reproduction interdites Copyright and all other rights reserved 4 Ay TRANSPORT e VLF signal processing Peak detection of the amplitude modulated signal from the demodulator allows the VLF image signal of the signal modulating the transmission carrier frequency to be collected It is amplified by two emitter follower mounted transistors and by a tuned transformer After amplification the VLF signal rectified by a diode bridge is filtered by a RLC type cell In normal operation the voltage at the filtering capacitor terminals is between 9 and 14 V f Threshold and time delay oscillator The obtained filtered d c voltage feeds an emitter base coupling oscillator which delivers a 15 kHz approx sinusoidal signal Pick up time delay is provided by linking terminals C and C1 t 0 5s or C and C2 t 7 2 s of the oscillator stage This time delay prevents untimely pick up of the relay in the event of a short duration shunting loss g Output trigger The sinusoidal signal from the oscillator is level controlled by
6. 10 1 4 Setting brackets 1 2 eeu PX ELS RS 96 10 2 Data sheets 6 305 ote Le wa eoo DUe IU E Y 9 s ER aes 98 102 E Genemlu eos dob Sox COPIE DUE Deor adde et ades 98 10 2 2 Description of the datasheet llle 98 10 3 Adjustment and commissioning leeren 100 10 3 1 Track ciwuit UM71 vd ese aise ek te aero edes 100 10 3 2 Intermediate data collector llle 104 APPENDIX 1 CONFIGURATION OF THE UM71 TRACK CIRCUIT TC with end of section transmission TC with intermediate transmission APPENDIX 2 TRACK CIRCUIT TERMINATION Configurations Electrical Separation Jomt ESJ Insulated Rail Joint IRJ traction current 200Amps Insulated Rail Joint IRJ traction current gt 200Amps APPENDIX 3 CONFIGURATION OF INTERMEDIATE DATA COLLECTOR Configurations Information point IP Pin Point Detector PPD with MU Pin Point Detector PPD without MU p meses i oT Psi v mes l CS Transport Communication reproduction interdites Copyright and all other rights reserved ay TRANSPORT APPENDIX 4 USE OF THE TRACK CIRCUIT IN POINTS Track circuit with TURN OUT lt 36 meters Track circuit with TURN OUT gt 36 meters APPENDIX 5 FREQUENCY APPLICATION Simple case Multiple parallel tracks APPENDIX 6 UM71 TRANSMITTER Block diagram APPENDIX 7 UM71 RECEIVER Block diagram APPENDIX 8 ELECTRICAL SEPARATION JOINT ESJ
7. Communication reproduction interdites Copyright and all other rights reserved C Ay TRANSPORT This consists of a LC series circuit tuned at a frequency close to F1 mounted in parallel with a high value capacitor Its characteristics are low capacitive impedance at frequency F1 with the parallel capacitor shorted by the series branch tuned at F1 capacitive impedance at F2 resulting from the tuning of the three components As frequency F2 is higher than frequency F1 the inductive series tuning is masked by the parallel capacitor There is one tuning unit per track circuit frequency TRACK CIRCUIT TRACK CIRCUIT Tuning Unit Fl Z TU pole to FI fA Z TU pole to F2 Z TU zero to F2 U Z TU zero to Fl Figure 12 electrical analogy For track 1 frequency pair a VIF1 TU exhibiting a zero at 2300 Hz and a pole at 1700 Hz a VIF2 TU exhibiting a zero at 1700 Hz and a pole at 2300 Hz For track 2 frequency pair a V2F1 TU exhibiting a zero at 2600 Hz and a pole at 2000 Hz a V2F2 TU exhibiting a zero at 2000 Hz and a pole at 2600 Hz The zero defines the frequency at which the TU impedance is minimum m ems iT PSA ATON ANE ws T CS Transport Communication reproduction interdites Copyright and all other rights reserved r Ay TRANSPORT The pole defines the frequency at which the TU impedance is high The Air core inductor ACI located at the cent
8. Copyright and all other rights reserved S TRANSPORT 1 PURPOSE OF THE DOCUMENT The purpose of this document is within the context of the PTC network to define the installation of the UM 71 type track circuit gauge track 1 603 m 53Kg m rails d c 1500 V electrified tracks This document contains general considerations on the UM 71 track circuit the principle of operation of the various items making up the track circuit a physical description of these items layout rules connections track circuit length protection against atmospheric voltag surges etc installation of field equipment along the track as well as in signal boxes and equipment rooms settings to be made and commissioning of track circuits UMI cx ancurr cmusesiaMLeSa0323 1 2 TER INSTALLATION MANUAL Page 12 CS Transport Communication reproduction interdites Copyright and all other rights reserved Lat HZ A ay TRANSPORT 2 1 se of the UM 71 track circuit The UM 71 track circuit allows safe detection of the presence of a train on the track section on which it is installed The unoccupied or occupied status of the track circuit is the basic data of the signaling logic This data conditions train spacing functions route control point control and interlocking train follow up etc The UM 71 track circuit can be used on dc electrified tracks on a c elect
9. The assembly presents an impedance of approximately 3 to 4 ohms according to frequency The length nature and positioning of the connecting cables between the TU and the ACI must be strictly observed Their impedance significantly impacts the tuning of the assembly CrRisPsiGMi95 40 323 1 2 mes jj Q CS Transport Communication reproduction interdites Copyright and all other rights reserved C Ay TRANSPORT 4 7 Matching and linking of field equipment room and land side cabinet ipment 4 7 1 Principle of operation fig 18 4 7 1 1 Adaptation of the transmission line transmission cable transformer transmitter 1 10 to tuning unit UU matching unit MU Figure 18 The MU consists of a tapped transformer aseries inductor two capacitors connected head to tail a series resistor short circuited in this utilisation Coupling of a MU is according to the type of termination In transmission on ESJ IRJ or IT the transformer is coupled to a ratio of 10 Fig 18 The series inductor inserted in the transmission circuit promotes shunting within the track circuit and allows the short circuit returned from the track at train crossing to be masked at transmitter output UE mss iT NTALAON vantat mes I Q CS Transport Communication reproduction interdites Copyright and all other rights reserved c Ay TRANSPORT 4 7 1 2 Adaptation of the recepti
10. Air Core Inductor ACI and tuning unit TU Detail of assembling Cabling measure and adjustment points Transmission without impedance bond Transmission with impedance bond Reception without impedance bond Reception with impedance bond INTERMEDIATE TRANSMISSION IT Configuration Erecting plans Air core inductor ACT and tuning unit TU Detail of assembling Cabling measure and adjustment points ntermediate Transmission INTERMEDIATE DATA COLLECTOR INFORMATION POINT Configuration Erecting plan MU Cabling measure and adjustment points PIN POINT DETECTOR Configuration Erecting plan PPDU CTRSPS GMLSSMo3S 1 2 mem CS Transport Communication reproduction interdites Copyright and all other rights reserved C ay TRANSPORT Cabling measure and adjustment points with MU Cabling measure and adjustment points without MU APPENDIX 25 EXTERNAL LINKS APPENDIX 26 PROTECTION ATMOSPHERIC VOLTAGE SURGES ELTEL lightning arrestor Transient voltage suppressor Model 1 5KEZ00 Transient voltage suppressor Model V130LA20A Soule low voltage lightning arrestor APPENDIX 27 ADJUSTMENT TABLES KEM KRV sheet 1 2 KRV sheet 2 2 APPENDIX 28 DATA SHEETS Part one Part two Part three Part four Part five APPENDIX 29 MOUNTING STAKE ae emacs T2 INSTALE ATION Wen C en I CS Transport Communication reproduction interdites
11. CTRSPSIGMLSS403 1 2 o Pes CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT 3 6 Broken rail detection Broken rail detection is provided when the provision described in this manual are used crrvspsiGmii9s 40 323 1 2 mes CS Transport Communication reproduction interdites Copyright and all other rights reserved TRANSPORT 4 PRINCIPLE OF OPERATION 4 1 Frequency distribution Appendix 5 4 1 1 Frequency assignment scheme The UM 71 track circuit operates at one of four basic carrier frequencies grouped in two pairs One pair assigned to track 1 VI F1 1700 Hz VI F2 2300 Hz One pair assigned to track 2 V2 F1 2000 Hz V2 F2 2600 Hz 41 2 Frequency junctions Successive track circuits or track circuits installed on parallel tracks must operate at different frequencies When there are more than two parallel tracks adjacent tracks must be assigned different frequencies and special care should be taken when setting up equipotential links between tracks See paragraph 7 Junction on electrical joint of two frequencies not belonging to the same pair is not available at this time Tennination junction on insulated rail joints of two track circuits with the same frequency is prohibited In this case it is possible to use frequencies not belonging to the same pair 41 3 Frequency j
12. Track circuit Receiver direction of traffic 7 Chronogram Rx PPD Figure 4 PPD Anticipated switch of sign Generally used for anticipated switch off signal fig 4 For example when signs are not located close to the ESJ but few meters upstream This equipment can switch off the sign as soon as it has been passed throught without waiting the ESJ to be passed CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT 2 5 Use of the UM 71 track circuit in points Appendix 4 Isolation of the points and crossings must be provided per the parallel arrangement Furthermore the maximum length of the antenna connected to the main line is in principle set at 12 meters However greater antenna lengths can be tolerated if not exceeding 36 meters provided polarity transfers are implemented at 12 metres intervals from the point and crossing joints to the fouling point Note The broken rail is not detected in 36m areas For lengths in excess of 36 meters an additional receiver shall be created on insulated rail joints at end of antenna in this case the broken rail is always detected See appendix 4 creisPsiGMisi40 323 1 2 men CS Transport Communication reproduction interdites Copyright and all other rights reserved r Ay TRANSPORT 3 UM71 TRACK CIRCUIT CARACTERISTICS 3 1 Design
13. parameters The operational characteristics of the UM71 jointless track circuits as described in this document are valid for the following conditions 53Kg m to 60Kg m rail space permeability of the rail ranging from 80 to 150 1 603m gauge track wooden or concrete sleepers insulation between rail equally distributed equally distributed propagation constant rail connections resistance less than 100 microohms CIRSPSIGMLSSM030 1 2 men ee Page 21 Q CS Transport Communication reproduction interdites Copyright and all other rights reserved TRANSPORT 32 Ballast resistance The operation to the jointless track circuits developed for the PTC is ensured for a minimum values of ballast resistance of 1 5 ohm Km CTRISPS GML 95 40 323 1 2 men CS Transport Communication reproduction interdites Copyright and all other rights reserved CI YLA hy TRANSPORT 3 3 Theoritical drop shunt The maximum value of non inductive resistor which when connected between the rails causes the relay to de energise even under the worst case is called the theoretical limit of shunt For the track circuit used by PTC a minimum value of 0 1 ohm is guaranteed except within the tuned area In the tuned area the theoretical limit of shunt varies from 0 1 to 0 ohm and there is an overlap of the shunt areas of the two successive track circuits with receiver transm
14. reserved Ay TRANSPORT mentee ttt te coding for receiver 1700Hz coding for receiver 2000Hz coding for receiver 2300Hz coding for receiver 2600Hz APPENDIX 19 POWER SUPPLY Presentation and coding APPENDIX 20 NS1 STANDARD NS1 Assembling wiring Front view NSI Assembling wiring Rear view NS1 Assembling wiring Fixed part of NS1 PFC12 and PFO NS1 Assembling wiring Marking Principles labels NS1 Assembling wiring Central label support NS1 Equipment tools Crimping pliers NS1 Equipment tools Plug in pliers APPENDIX 21 TERMINATION ON ELECTRICAL SEPARATION JOINT ESJ Configuration with two Single Matching Units Configuration with one Double Matching Unit Erecting plans Matching Unit MU and Tuning Unit TU Air Core Inductor ACT Cabling measure and adjustment points ESJ with transmitter and receiver with two Single MU ESJ with transmitter and receiver with one Double MU ESJ with two receivers with two Single MU ESJ with two receivers with one Double MU APPENDIX 22 TERMINATION ON INSULATED RAIL JOINTS IRJ Configuration CTRISPS GM 95 40 323 1 2 po Np S Q CS Transport Communication reproduction interdites Copyright and all other rights reserved asi S TRANSPORT APPENDIX 23 APPENDIX 24 IRJ with current traction continuity lt 200Amps IRJ with current traction continuity gt 200Amps Erecting plan
15. 0 0 0 0 0 cee eee eet eens 26 4 PRINCIPLE OF OPERATION seene RR RR I 27 41 Frequency distribution llslsseeeee B 27 41 1 Frequency assignment scheme nunun anana 27 4 1 2 Frequency junctions 0 eee eee 27 4 1 3 Frequency junctions in line cables 0 0000 c eee 27 2 2 Mamie e eana a BR ORs aa a a 29 4 2 1 UM TE signal oeaan e erate a E SR aw hoe inte iras 29 4 2 2 Functional description of the transmitter 0 30 42 21 Stabilized power supply 0 eee eee 30 4 2 2 2 CROIISIDE Lu cs ned rd wale ak QA each ers Sw a Ca 31 4223 Frequency divider sees 31 4224 Amplifier 9063 6 sata row Vu ooa EN ea E e ee eus 32 422 5 Output transformer KEM sees 32 4 2 2 6 Cunent regulator seit 8 ashok eA ge os EA EIS ta ee 32 L3 Receta ho FS ERO ESR OG OEP ERES XXE aa d a dex 34 43 1 Papost oues i eh or dotis e Gotan law ae amp Oren wet ae Se ata 34 4 3 2 Functional break down leeren 34 4 3 3 Safety CMe eee hi esx eee Cord x eu a eed Waar Se 34 43 4 Description of functions 0 0 00 eee eee eee 35 4 4 Electrical separation joint FSJ 2 2 ee 40 CS Transport Communication reproduction interdites Copyright and all other rights reserved eee e ay TRANSPORT 4 4 1 Composition of an ESI 2 eee 40 4 4 2 Configuration of the ESJ 0 ee 40 4 4 2 1 with a transmitter and
16. a Schmidt trigger consisting of two transistors Operation of said Schmidt trigger is identical with that of the trigger providing carrier threshold The amplitude of the signal output by the oscillator depends on the d c power supply voltage A 15 kHz square signal will only be sent to the output amplifier when the oscillator power supply is 2 8 V h Relay amplifier The purpose of the output amplifier consisting of a transistor stage is to deliver a power sufficient to energize the relay as soon as the signal from the 15 kHz oscillator passes the trigger threshold hence go no go operation After rectification and filtering a transformer provides the energy necessary to energize a type relay 24 V 250 ohms It also provides galvanic insulation from the outside A small part of the 15 kHz output signal is picked up to be fed back to the carrier signal at the input This allows a slightly higher pre bias of the input trigger and a 30 mV approx hysteresis to be obtained such that the relay drop out occurs at an input voltage CTRISPSGMLASA037 1 2 Fes CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT lower than that necessary for pick up Thus with a 24 V receiver power supply voltage the input voltage VRIR2 is 200 to 210 mV for relay pick up 170 to 180 mV for relay drop out e esses iT PSTALATEN ANE mee L CS Trans
17. ae 59 4 8 2 1 configuration ciues KO ae RE eS EO RU 59 4 8 2 2 principle saree tai RC c BAGP SE AP asd wee EE NR cat 60 4 8 2 3 Shunt efficiency iia aie neo ore RE E CA EORR wee Aa ae 61 48 2 4 Installation rules cee nnn 61 4 9 Track compensation 5 22 bee Sale eere Re RR os e Rho 63 49 PWHBCID usse uo medie VERRE pP a E eee A 63 5 DESCRIPTION OF EQUIPMENT eeee n n I nn 66 5 1 Equipment at the wayside 0 eee ees 66 5 1 1 Aircore inductor ACD 0 0 cee eee eee 66 5 1 2 Tuning wit IU couv iR ORS eka cae tate 66 5 1 3 Pin Point Detector Unit PPDU 00 eee 66 5 1 4 Matching Unit MU 26 cae e erdt RR men M 67 5 1 5 Compensation capacitors 0 eee 67 5 2 Equipment installed in a cubicle or equipment room 68 52 L Support plate osuere a esca dpa ar Sue mts 68 5 2 2 Connectors PFC 12 PFC 0 and PFO Luuullllsesesse 68 creisPs GML9s 40 323 1 2 Pes j CS Transport Communication reproduction interdites Copyright and all other rights reserved r ay TRANSPORT 5 2 3 Transmitter wit 00 0 eee eee 69 5 2 4 Receiver unt o 6s 6 Gk was we se Bae Ca ews PAs EX EE E 69 5 2 5 Power supply unit 515 co ER eS ewan ave EPOR SS 70 5 26 IIR JOD ote Rese hn Seat ee wie so ar Lau 70 53 WHE uiuos S68 e p e Se OA ane Xa tse dames OES 71 6 INSTALLATION OF THE EQUIPMENT e eee eese 72 6 1 Equipm
18. ansmitter at Fo 1700 Hz 15 6 Hz for a transmitter at Fo 2000 Hz 18 0 Hz for a transmitter at Fo 2300 Hz 20 3 Hz for a transmitter at Fo 2600 Hz CS Transport Communication reproduction interdites Copyright and all other rights reserved r hy TRANSPORT Oscillator F Fo 11 Hz Fo 11 Hz Fo 11 Hz Figure 1 UM 71 signal 4 2 Functional description of the transmitter Appendix 6 The transmitter consists of the following circuits a stabilized power supply an oscillator an amplifier a frequency divider a current regulator 4 2 2 1 Stabilized power supply As the power supply voltage may vary between 22 5 and 28 8 V it is stepped down to a stable value by means of Zener diodes This voltage adjusted at 18 V allows the oscillator to output a constant voltage independent from the general 24 V power supply variations LCTR SPSIGMLSA037 12 mes CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT P 4 2 2 2 Oscillator The LC type oscillator is used to generate the following frequencies F AF and F AF The oscillator distinctive features are the tuning circuit takes account of the 18 V power supply source impedance thus the output level decreases as the source impedance incre
19. areceiver 020055 40 4422 with two receivers cus R E Ro e ea TE Rea 41 4 4 2 3 with two transmitters not recommended 41 4 4 2 4 with transmitter or receiver located in interface with areas non mounted with track circuits fig 9 2 0 6 42 4 44 3 Principle of operation ofthe ESI www eee eee 43 4 4 4 Electrical analogy oorr XI oR ae Ra ee Pee 49 4 5 Termination on insulated rail joints IR 51 45 Configuration ocio eerie mI hr SRA EO ca 51 452 Operating principle see e y RR xac 51 4 6 Intermediate transmission IT 0 000 cc ees 53 4 6 1 Configuration 2 eee E Sa Se TAP e EIU EE DEA 53 4 6 2 Operating principle 0 0 0 n n RII 53 4 7 Matching and linking of field equipment room and land side cabinet COMMON cod Rose EXER Genie me ose aree eds y ad idera 55 4 7 1 Principle of operation 2 cee ee n n n n n B 55 4 7 1 1 Adaptation of the transmission line eese 55 4 7 1 2 Adaptation of the reception line 00 e eee 56 48 Intermediate data collector IDC 0 cece 57 48 1 Information pint IP 1 2 eee 57 4811 configuration cece seen I III 57 4 8 1 2 Principle rut LL p RACER CERE OR ke ee a 57 4813 Incertain status area 1 eee 58 4 8 1 4 Shunt efficiency 0 cece cee eee eee 58 48 15 Installation rales 00 ec es 59 4 8 2 Pin Point Detector PPD 2225 bos Se 6 6 Eee Ce la
20. ases tuning at F AF is provided by two capacitors mounted in series as shown on the simplified diagram below F AF is obtained by shorting capacitor Cy fig 2 Figure 2 oscillator Switching between these two frequencies is drived by the divider circuit output logic state 4 2 2 3 Frequency divider The transmitter must be shifted by a basic frequency known as VLF Very Low Frequency The modulating signal can be obtained after division by 128 ofthe transmitter carrier frequency Fo in self modulated mode jumper set between terminals M1 and M3 UMI TRACK aco CmuSPSIGMLe540323 1 2 INSTALLATION MANUAL Bex CS Transport Communication reproduction interdites Copyright and all other rights reserved c Ay TRANSPORT of a frequency external to the transmitter for specific applications external modulation the modulating signal is fed across terminals A and M3 Division by 128 is provided by a CMOS logic circuit whose output controls shorting of capacitor Cy 4 2 2 4 Amplifier The signal from the oscillator is current amplified by a setup known as Super p consisting of an emitter follower mounted preamplifier transistor voltage gain 1 a power stage Darlington transistor This setup outputs a stable output voltage independent from the power supply voltage the very high gain makes the oscillator insensitive to the nature of the load 4 2 2 5 Output transfonn
21. ching Unit and the receiver it is made at the secondary of the MU Note When the PPD is very close by the receiver the adjustment can be made in a simpler manner by replacing the Matching Unit with an adjustable resistor 1000 see appendix 24 The use of a MU is better for noise immunity The voltage on the R1R2 inputs of th receiver should be 2270mv i CS Transport Communication reproduction interdites Copyright and all other rights reserved S TRANSPORT 4 9 Track compensation 4 9 1 Principle The track can be represented by the following equivalent electrical circuit G 1 Rb is due to the losses caused by the ballast The resistance Rb Ohm km can vary from 1 5 Ohms to infinity The capacitor C a few uF km depends of the type of track but is insignificant for the UM71 TC frequencies The longitudinal impedance is mainly inductive about 15 Ohms km for a R resistance of about 1 50 Ohm The longitudinal impedance limits the signal propagation very quickly This inductive impedance can be greatly reduced by artificially increasing the capacitance between the 2 rails of the track per km by adding capacitors carefully spaced out between the rails this method constitutes track compensation and allows longer track circuits higher short circuit currents in the case of track machine transmission AME cmrro Ta PSAL MANA e CS Transport Communication reproduction interdite
22. ediate data collector Each type applies in different use intermediate data collector in voltage IP Information Point intermediate data collector in current PPD Pin Point D tector Intermediate data collector in voltage IP This configuration is not used in the PTC context As atule the Intermediate Data Collector associated with an intermediate transmission track circuit allows level crossing release functions providing barrier reopening or enabling road signs after crossing of a train CTR SPSIGMLSSHO3S 1 2 o mer eee CS Transport Communication reproduction interdites Copyright and all other rights reserved Col YLA 4 Ay TRANSPORT Direction of traffic Figure 3 IP level crossing The track section included between the transmitter Tx and the Intermediate Data Collector IP makes up an self operated track circuit Fig 3 The IP shunt point is before the IP location None signal can be associated to the IP because the signal is switched off before the IP has been passed throught The IP is generally used to provide liberation information i e Level Crossing in this case the transmitter is located upstream of the Track Circuit CTRISPS GMLI95 40 323 1 2 UM71 TRACK CIRCUIT EN NL Q CS Transport Communication reproduction interdites Copyright and all other rights reserved Ry TRANSPORT 2 4 2 Intermediate data collector in current PPD
23. ent at the wayside 0 0 cee eee 72 6 1 1 Termination on electrical separation joint 72 6 1 1 1 ESJ Installation an x REESARETERESEDethA eS 72 6112 Cabes sua s eee Oen GG Fe St exul d ke es 73 6 1 1 3 Special layout requirements 00 000 e ee eee 73 6 1 2 Termination on insulated rail joints ARJ 74 6 1 2 1 IRJ Installation oris web e FS OE A eed 74 6 1522 Cables Peccata ut ex ACRI IR EIU RORIS etc eee 74 b 6 13 Intermediate transmission IT 000 cee eee ee eee 75 6 1 3 1 IT Installation ico ae LYRA EE BOLE IG 75 6 1 4 Intermediate Data Collector IP ee eee 76 6141 IP Installation 0 0 cc ce eee eee 76 6 1 5 Intermediate Data Collector PPD lese 77 61531 PPDIn adlation cee n RII TI 6 1 5 2 Gables oc rm dt eas a Ue Oe Ie a TE ac aa Fats TI 6 2 Equipment installed in racks or equipment rooms 78 6 2 1 Installation icle or equipment room equipment 78 6 2 1 1 NSI support plates cas eee e eR ER REEF EH 78 62 1 2 PFC 12 and PFC 0 connectors 000 cease 79 6 2 1 3 PFO blanking plate ssllee eee 79 6 2 14 Installation of the cable channels 79 6 2 1 5 Modular equipment e rp RE Rr s 79 6216 Coding io merere ee sad a Ee EOE PERSEO AU E qa 80 6 2 1 7 Connections lees Sada d A hae 81 f 62 18 Maling oi o
24. er KEM The signal from the amplifier is output through a tapped transformer allowing the transmitter output level to be adjusted while providing galvanic insulation The available voltage is a fonction of the winding ratio KEM which can be varied from 0 25 to 15 75 in 0 25 steps The level is 46 5V approx with a winding ratio of 3 5 under 220 ohms Depending on the configuration of each track circuit a KEM winding ratio is defined at the setting stage 4 2 2 6 Current regulator The signal from the transmitter is output at two possible power levels 10 W approx at low power LP 20W at high power HP with jumpers set across terminals M2 M4 MS A regulating device allows the equipment to be protected in case of excessive power use accidental output short circuit shunting of the track near the transmitter etc by rapidly reducing the transmitter output voltage This device from the image of the current picked up in the KEM transformer primary Circuit provides output voltage limiting through gradual reduction of the oscillator power supply voltage emvsesiresa032 1 2 Pen CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT The transmitter operates at constant current Thus at LP regulation is effective for a power supply current about 1 A and at HP for a current of about 2A E Pes CS Transport Communica
25. ge This stage has a very high input impedance and thus prevents the trigger from loading the input filter parallel branch The matched signal is transmitted to a circuit consisting of two transistor stages known as a Schmidt trigger which determines the track relay pick up and drop out thresholds independently from the power supply voltage d Demodulation fig 5 The purpose of demodulation is to transform the frequency modulation into amplitude modulation to recover the modulation low frequency part eo Lemos i 2T INSTALE ATION MANUAL mex I CS Transport Communication reproduction interdites Copyright and all other rights reserved C Ay TRANSPORT RS The principle consists in sending the carrier signal at a constant energy level into a trap circuit tuned at a higher frequency Fo The collected level is then a function of the control frequency The demodulator consists of a transistor stage whose collector is loaded by a R L C type trap circuit Inductance is provided by the transformer primary winding As the trap circuit is tuned at frequency Fo any frequency variation on either side of Fo results in an amplitude variation of the signal at the shift frequency the carrier current is constant The signal collected at the transformer secondary winding making up the trap consists of a HF carrier corresponding to the signal frequency and a VLF envelope representing the transmitter shift frequency
26. h significant asymmetry between elementary branches eee emissus T2 YAN HANA mes CS Transport Communication reproduction interdites Copyright and all other rights reserved AY TRANSPORT 2 3 Track circuit termination Appendix 2 In conventional open line installations the UM 71 track circuit is limited at each end by an electrical separation joint ESJ The purpose of the ESJ is to provide continuity of the traction return circuit without creating a mechanical discontinuity of the rail insulated rail joints this makes it compatible with the laying of long welded rails to inhibit signalling current propagation beyond the track circuit limits At the boundary with different technology track circuits e g ITE or 50 Hz or d c the UM 71 track circuit must be limited by insulated rail joints RJ termination i e one joint on each stretch of rail Traction current return continuity is provided at insulated joint crossing by track inductors CTR SPSIGMLSS40323 12 Pei CS Transport Communication reproduction interdites Copyright and all other rights reserved 2 4 1 r ay TRANSPORT Intermediate data collector IDC Appendix 3 The Intermediate Data Collector makes up an auxiliary receiver which can be installed within the track circuit limits Important The intermediate data collector cannot be used in compensed track It exists two types of interm
27. ion of frequency F1 beyond the limits of the TC 4 44 Electrical analogy fig 16 The following figure presents in electrical analogy the ESJ principle at the adjacents frequencies TR mss a YUAN MANUAL oe T CS Transport Communication reproduction interdites Copyright and all other rights reserved M31 WL EY r Ay TRANSPORT Analogy for the frequency F1 Analogy for the frequency F2 Figure 16 electrical analogy at frequencies F and F2 CTRISPSIGML 95 40 323 1 2 eso CS Transport Communication reproduction interdites Copyright and all other rights reserved 4 hy TRANSPORT 4 5 Termination on insulated rail joints RJ 4 5 1 Configuration appendix 9 A termination on insulated rail joints set up in transmission or reception includes an air core inductor ACT a Tuning Unit TU a Matching Unit MU connecting cables between the track and the ACI connecting cable between the ACI and the TU a connecting cable between the TU and the MU 4 5 2 Operating principle In a termination on insulated rail joints setup the track circuit terminal impedance transmission or reception is defined by the parallel setup of the ACI and the TU The TU capacitive impedance tunes up with the ACI inductive impedance thus forming a trap circuit Fig 17 The assembly presents an impedance of approximately 3 to 4 ohms according to frequency CS Transport Communica
28. itter and receiver receiver electrical joint There is not overlap for transmitter transmitter electrical joints cresspsiamii9s40323 1 2 UM71 TRACK CIRCUIT D e Q CS Transport Communication reproduction interdites Copyright and all other rights reserved TRANSPORT 3 4 Maximum and minimum track circuits length The lenght of the track circuit is measured between the points connection of the air core inductor With a minimum value resistance ballast of 1 5 ohm Km 1 without compensation track Maximum length End fed transmission 650m Minimum length End fed transmission 100m 2 with compensation track Maximum length End fed transmission upto 1100m Minimum length End fed transmission 600m Maximum length of track circuits installed with Intermediate Data Collector 1 Pin Point Detector PPD End fed transmission Without boosting unit 250m with boosting unit 400m 2 Information Point IP End fed transmission 650m CTR SPS GML 95 40 323 Y 2 mex CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT 3 5 Maximum lines length between _ES VIRVPPD IP equiments and _transmitter receiver transmission line with ESJ AIRJAT 150m reception line with ESJ IRJ 150m reception line with PPD 100m reception line with IP 1000m Cables caracteristics are presented in chapter 6
29. mon to the same ESJ This can be achieved either conventionally through the use of insulated rail joints which break the rail electrical continuity or through electrical separation joints which do not require rail discontinuity Electrically the ESJ consists of two nested trap circuits tuned at the frequencies of the two adjacent track circuits respectively Their purpose is to have at the track circuit end a relatively high terminal impedance at the TC frequency in order to promote signal transmission The impedance of an ESJ is in the order of 1 3 to 2 ohms depending on frequency to prevent the track circuit frequency from propagating beyond the ESJ extreme limits longitudinal cross talk These functions are provided through the implementation of tuned circuits tuning units at the ESJ ends There are two types of tuning units CTRISPS GML95 40 323 1 2 meo Q CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT 1 Tuning unit FL V1 or V2 fig 10 Mace Figure 10 Tuning unit F1 This consists of a LC series circuit tuned at a frequency close to F2 Its characteristics are capacitive impedance at frequency F1 low capacitive impedance at frequency F2 2 Tuning unit F V1 orV2 fig 11 Figure 11 Tuning unit F2 anges cms 1 3 ISTALATION MANUAL Pew L CS Transport
30. o 1 to 1 5 is done in accordance with line length and the location of the IP in track circuit The 22 ohms resistance in use in this configuration is not short circuited It increases the IP impedance to avoid loading the support track circuit 4 8 1 3 Incertain status area Fig 21 Track circuit M direction of traffic Chronogram Rx IP up down Figure 21 incertain status area The IP change of status cannot be precisely define This status varies according to the ballast resistance value The incertain status area rank from 35 to 80m from the IP location 4 8 1 4 Shunt efficiency The theoritical shunt 0 1 ohm value is guarantee between the transmitter and the IP UMI ick ancurr CTRSPSIGMLSS40323 1 2 PSAL NANA Pes CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT 4 8 1 5 Installation rules The IP cannot be used in compensed track Only one IP can be installed in a end feed transmission track circuit Two IP can be installed in an intermediate transmission track circuit There is not track circuit limitation length when using IP 4 8 2 Pin Point Detector PPD 4 8 2 1 configuration A PPD includes apin point detector unit PPDU areceiver and a relay cables between PPD and receiver a boosting Unit if the main Track Circuit length is over than 200m a Matching Unit MU
31. on line fig 19 transformer reception cable oa l I I l I 1 1 E P to tuning unit a p l _l E receiver 2 f matching unit MU Figure 19 reception line The ratio 1 1 is used in this case The transformer is used as a galvanic insulation between the track and the receiver and the series resistor is also short circuited creispsicMi9si40 323 1 2 Pes CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT 4 8 Intermediate data collector IDC Appendix 11 4 8 1 Information point IP 4 8 1 1 configuration an information point includes a receiver UM71 with an associated relay a matching unit connection cables between the rail and the MU cable between the MU and the receiver 4 8 1 2 Principle fig 20 TRACK CIRCUIT _ resistor zi Matching Unit transmission cable receiver IP L4 Figure 20 Information point The voltage signal measured between the two rails anywhere in the track circuit is transmit to receiver associated with a relay The maximum reception line is set at 1000m with the cable specified at chapter 6 CTRYSPS GML95 40 323 1 2 Bes CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT adaptation MU Adjustment of the transformation rati
32. other rights reserved ay TRANSPORT 4 8 2 3 Shunt efficiency fig 23 Track circuit a Rx direction of traffic AxPPD Tx receicer receicer transmitter R1R2 receiver voltage Chronogram Rx PPD M nen eae ee up Figure 23 Shunt efficiency The theoritical shunt value is guarantee between the transmitter and the PPD following the under conditions The Track Circuit section located between the receiver and the PPD shall be free of rolling stock and no be shunted For those reasons it is forbidden to run several trains simultaneously on the same track circuit 4 8 2 4 Installation rules The IP cannot be used in compensed track The PPD shall be installed at less than 100m from the transmitter The maximum receiver cable length is set at 100m The maximum main Track Circuit UM71 length is set at 250m this length can be CmwSPSGMLeSA4037 1 2 mes j Q CS Transport Communication reproduction interdites Copyright and all other rights reserved AY TRANSPORT extend to 400m by adding a Boosting Unit device The boosting unit device shall be located at 1m from the PPD Unit on the track circuit receiver side There is one PPD per frequency The information delivered by the PPD is transmitted to a standard receiver through a Matching Unit The adjustment depends on the length of the track circuit the length of the linking cable between the Mat
33. port Communication reproduction interdites Copyright and all other rights reserved ay TRANSPORT 4 4 Electrical separation joint ESJ Appendix 8 4 4 1 Composition of an ESJ The ESJ consists of a track section limited at each end by a LC type tuned circuit known as the tuning unit TU A non saturable track inductor known as the ACT unit air core inductor or ACI Air Cored Inductor is located at the centre of the ESJ Cables provide the link between the units and the track The ESJ contains the transmission and reception points for the track circuits located on either side of its point of installation 4 4 2 Configuration of the ESJ The ESJ can be configured 4 4 3 with a transmitter and a receiver a transmitter Fx and a receiver Fy fig 6 as generally found on end of section transmission track circuits see diagram below The Fx track circuit transmission is done at the Fx tuning unit The Fy track circuit reception is done at the Fy tuning unit gt receiver Fx transmitter Fy U gt F n Fx F Figure 6 config transmitter receiver o Emmuun O e DII PLATES NANA me CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT 4 4 2 2 with two receivers Two receivers fig 7 as generally found on intermediate transmission track circuits Fx and Fy Track circuits
34. re of the ESJ allows re equalization of the traction current returns between rails enhancement of the ESJ Quality value thus increasing the TC terminal impedances The two rails in track circuit operation make up the transmission line This is defined by ecl parameters R resistance per unit length of the rails ohm km longitudinal impedance L inductance per unit length of the rails H km longitudinal impedance G conductance per unit length of the track S km transverse impedance C capacity per unit length of the track F km transverse impedance The track can therefore be represented by the following circuit diagram Figure 13 On the very short track section represented by the ESJ parameters G and C can be deemed negligible only R and L are taken into account for calculation of the ESJ CTRSPSIGMLSSAO323 1 2 o Pes j CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT Figure 14 shows the circuit diagram of the impedances involved in an ESJ connecting cables between the units and the track Figure 14 ESJ circuit diagram The example below fig 15 shows the electrical analogy of the ESJ at frequency F1 Q CS Transport Communication reproduction interdites Copyright and all other rights reserved r 4 ay TRANSPORT
35. reception are done at the correspondant tuning unit Transmitter Fx Transmitter Fy JH Receiver Receiver Fx Fy Figure 7 config receiver receiver 4 4 2 3 with two transmitters not recommended Using Two transmitters in the same ESJ is possible but no recommended fig 8 Limited the transmitters power is required no to sature the tuning unit with high current CTRISPSIGML 95 40 323 1 2 mes jj CS Transport Communication reproduction interdites Copyright and all other rights reserved C ay TRANSPORT receiver Fx receiver Fy L e Fx Figure 8 config transmitter transmitter 4 4 2 4 with transmitter or receiver located in interface with areas non mounted with track circuits fig 9 The extreme tuning unit could be replaced with a short circuit cable The ACI is not required in this configuration The ESJ length is shorter UMI TRACK cincurr CTR SPSIGMLOSA03 1 2 PT A me l CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT receiver Fx Transmitter or receiver Figure 9 interface with area without track circuits 4 4 5 Principle of operation of the ESJ Implementation of track circuits requires reliable separation of audio frequencies on all contiguous track circuits com
36. rified tracks on non electrified tracks As regards electrified tracks the traction current retum circuit must be the bi rail type cms T LIS ms Q CS Transport Communication reproduction interdites Copyright and all other rights reserved ay TRANSPORT 2 2 Configurations of the UM 71 track circuit Appendix 1 The UM 71 track circuit can be set up for end of section transmission or intermediate transmission In end of section transmission configuration a termination is used by the track circuit as transmission point as a rule the downstream end with the upstream termination making up the reception point Fig 1 Track circuit receicer transmitter Figure 1 End of section transmission TC In intermediate transmission configuration transmission is provided at the centre of the track circuit A receiver is installed at each end of the track circuit The data delivered by both elementary receivers are generally summed Fig 2 and this is particularly important with compensated track circuits mtm emssscssuss i fa PALATO MA omes j Q CS Transport Communication reproduction interdites Copyright and all other rights reserved Lar VLA Ay TRANSPORT Track circuit x i i Rx receicer transmitter receicer Data TC x Figure 2 Intermediate transmission track circuit The track circuit can operate wit
37. s Copyright and all other rights reserved r Ay TRANSPORT track compensed principle half step half step 1 35 to 85rrj 35 to 85m 1 rr O receiver transmitter capacitors The length for which compensation is used depends of the track characteristics track impedance ballast resistance rail gauge with a ballast resistance of 1 5 ohm km compensation is necessary when the TCs is longer than 600m for an end of section transmission For shorter lengths of TCs compensation is not used The maximum length of a compensated TC is 1100 m for an end of section transmission The condensers capacities are 22 and 33 pf The choice of capacitors is a function of the TC frequency in order to obtain optimum transmission matching CTRISPS IGML 95 40 323 1 2 Pea CS Transport Communication reproduction interdites Copyright and all other rights reserved
38. s reserved C hy TRANSPORT 4 3 4 Description of functions a Matching Fig 3 KRV ratio to Ri R2 receiver input Figure 3 Matching The matching function is achieved by an input transformer KRV which provides galvanic insulation between the signal from the outside of the room and the receiver internal electronics a low primary impedance V1V2 providing protection against spurious signals in the event of failure and earthing of the cable wire level adjustment by means of secondary winding taps 73 possible ratios b Carrier signal filtering fig 4 The LC type input filter comes in the form of a half T cell with two branches one series LC branch and one parallel LC branch see diagram below CTRISPSIGML 95 40 323 1 2 Pes CS Transport Communication reproduction interdites Copyright and all other rights reserved TRANSPORT E Figure 4 filter The input filter is an analog bandpass filter tuned at one of the four input signal Fo frequencies 1700 Hz 2000 Hz 2300 Hz or 2600 Hz This filter has a pass band of 40 Hz The filter selects the signal which corresponds to its tune frequency and thus suppresses the other signals that may be present on the track c Carrier control threshold The signal selected by the input filter is preamplified by an emitter follower mounted transistor sta
39. tion reproduction interdites Copyright and all other rights reserved hy TRANSPORT 4 3 Receiver Appendix 7 4 3 1 Purpose The receiver is used to detect the presence of a train in the associated track section The receiver must recognize the carrier signal in quality modulated frequency and in quantity level 4 3 2 Functional break down The receiver consists of the following functional circuits an input transformer for adjustment of the TC KRV a bandpass carrier filter used for spurious signal suppression a trigger providing the threshold function a demodulator used to search for the modulation VLF signal a VLF amplifier a VLF rectifier and filter circuit a delayed threshold oscillator which transforms the VLF energy into a 15 kHz signal and also provides the relay pick up time delay function an amplifier which delivers the power necessary to energize and lock the 24 V 250 ohms relay 43 3 Safety criteria Data are received in safety which implies the criteria defined below As the receiver provides the TC shunting function the apparent relay pallet drop out threshold must not decrease A non modulated pure frequency signal shall not cause the relay to be locked high No failure shall cause the relay to be re energized if the relay is normally de energized ee cms i 5T PSAL NEAL new TT CS Transport Communication reproduction interdites Copyright and all other right
40. tion reproduction interdites Copyright and all other rights reserved Ay TRANSPORT Z term IRJ Transmission or reception circuit Figure 17 Termination on insulated rail joints ZACI x ZTU 2xZcable Ztem IRJ ZACI ZTU 2xZcable A TU exists per frequency The ACI is common for all frequencies The length nature and positioning of the connecting cables between the TU and the ACI must be strictly observed Their impedance significantly impacts the tuning of the assembly CS Transport Communication reproduction interdites Copyright and all other rights reserved r Ay TRANSPORT ey 4 6 Intermediate transmission 4 6 1 Configuration appendix 10 A intermediate transmission includes an air core inductor ACI atuning unit TU a matching unit MU connecting cables between the track and the ACI connecting cables between the ACI and theTU connecting cables between the MU and the TU 4 6 2 Operating principle Intermediate transmission uses the same principle as transmission on insulated rail joints as described in section 4 5 Z cable T l Transmission Figur 17a Intermediate Transmission UMI mack ancurr CTRISPS GML95 40 323 1 2 INSTALLATION MANUAL es CS Transport Communication reproduction interdites Copyright and all other rights reserved S TRANSPORT
41. unctions in line cables IMPORTANT RULE Routing of a transmission and a reception with the same frequency within one same cable is prohibited Circuit pairing When wiring and installing the track circuits circuit pairing should be observed in the line cables CS Transport Communication reproduction interdites Copyright and all other rights reserved r hy TRANSPORT Each transmission or reception circuit shall use conductors from one same pair Incorrect circuit pairing results in cable transmission parameters being changed and may induce significant cross talk levels in adjacent circuits mete emssscssuns i PSALTON NANA omes Q CS Transport Communication reproduction interdites Copyright and all other rights reserved Ay TRANSPORT 4 2 Transmitter 4 2 1 UM 71 signal The transmitter generates a power limited sinusoidal signal at one of the four Fo basic frequencies 1700 Hz 2000 Hz 2300 Hz or 2600 Hz To provide protection against the various spurious signals from the track 50 Hz traction current harmonics currents output by chopper equipped locomotives the Fo basic frequency is encoded by shifting fig 1 Shifting consists in switching two frequencies with a modulation depth AF 11Hz Ie F AF and F AF The basic frequency is thus frequency modulated at a rate set by division by 128 of this basic frequency Fo hence the following VLFs 13 3 Hz for a tr
42. v exe SE era de A es Ra A NU 81 6 2 1 9 Condition of storage eee 82 Ta TRACTION CURRENT RETURN CIRCUITS DC ELECTRIFICATION 1500 V 2 0 ce BB 83 8 PROTECTION OF EQUIPMENT AGAINST ATMOSPHERIC VOLTAGE SURGES conc obec epe Sil ee ts Di eee ees ee eee 86 8 1 General i hs bas rure i REGE Bn ta eA ers ERR A Maw ee 86 8 2 Common mode protection 12 00 nne 87 8 3 Differential mode protection 2 0 0 0 cee eee 90 8 4 Installation of protection 2 0 nn 91 8 4 1 UM 71 transmitter or receiver alone 20000e 91 8 4 2 Installation of a transmitter or receiver 02005 91 GRE Tms 2T s PSPHLATON MANUAL Pes il j CS Transport Communication reproduction interdites Copyright and all other rights reserved hy TRANSPORT 8 443 Powersupply protection 0 0 0 enn 92 9 INSTALLATION ACCESSORIES 0 0 0 0 0 0 cece eee 94 9 1 Cubicle or equipment rom equipment eese 94 OLI Equipment 32 ec weaken cee BON LOE Re eM S o Pe ds 94 9 1 2 Miniature faston clip crimping procedure 94 9 1 3 Faston clip insertion removal procedures 94 10 SETTING AND COMMISSIONING OF UM 71 TRACK CIRCUITS 95 TOMY Seti 56v ce eo RO Osea wh eens aes bs te P VR 95 10 1 1 Setting generation 0 2 err mr RR 95 10 1 2 Set Up Table aca cas este E REPRE EON UE ER EUN a 95 IU L3 Seno facto o ue E EEEMESEERM RR are uS 96
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