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![Page 1: LED Signal](https://reader035.fdocuments.net/reader035/viewer/2022081507/56d6bd961a28ab30168e900f/html5/thumbnails/1.jpg)
LED SIGNALS IN
INDIAN RAILWAYS
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WHAT IS LED?
IT IS A DIODE WHICH EMITS LIGHT OF REQUIRE COLOUR WHEN FORWARD BIASED.
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INTERNAL STRUCTURE OF LED
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Colour Wavelength Voltage Semiconductor Material
RED 610 < λ < 760 1.63 < ΔV < 2.03Aluminium gallium arsenide (AlGaAs)Gallium arsenide phosphide (GaAsP)Aluminium gallium indium phosphate (AlGaInP)Gallium(III) phosphide (GaP)
Yellow 570 < λ < 590 2.10 < ΔV < 2.18Gallium arsenide phosphide (GaAsP)Aluminium gallium indium phosphide (AlGaInP)Gallium(III) phosphide (GaP)
Green 500 < λ < 570 1.9[< ΔV < 4.0
(AlGaP) Indium gallium nitride (InGaN) / Gallium(III) nitride (GaN)Gallium(III) phosphide (GaP)Aluminium gallium indium phosphide (AlGaInP)Aluminium gallium phosphide
DOPING MATERIAL, WAVELENGTH AND OPERATING VOLTAGE FOR COLOUR EMITTED BY LED
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WHAT IS LED SIGNALS?
IT IS REPLACEMENT FOR FILAMENT LAMP WITH LOT OF ADVANTAGES OVER DRAWBACK OF FILAMENT LAMP
OTHER SELECTION
BX110 V AC
NX110 V AC
Fuse 0.63 Amp
LED SIGNAL UNIT
AC I/P
DC I/P
MOTHER BOARD & HMU CARD #
#
ECR
UNIVERSAL CURRENT REGULATOR
Aspect control circuit with LED signal arrangement
UNDER GROUND CABLE
CLS Unit Relay room
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ECR
OTHER SELECTION
BX110 V AC
NX110 V AC
Fuse 0.63 /2 Amp
##
OTHER SELECTION
BX110 V AC
NX110 V AC
Fuse 0.63 Amp
LED SIGNAL UNIT
AC I/P
DC I/P
MOTHER BOARD & HMU CARD #
#
ECR
UNIVERSAL CURRENT REGULATOR
UNDER GROUND CABLE
RELAY ROOM CLS UNIT
Comparison between filament lamp & LED circuit
Aspect control circuit arrangement with filament lamp & LED signal
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ADVANTAGES OF LED SIGNALS
• Long life 1,00,000 hours .• Pre-focused. • Better visibility .• Very good short view .• No focusing on curved track.• Same type of ECR for all aspect and signal.• No phantom effect .
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DISADVANTAGES OF LED SIGNALS
• Colour of LED change according to temperature and supply voltage.
• Its intensity of light is high which affect the sight of the driver.
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Signal with Filament lamp & door open
Signal with LED lamp & door open
NO PHANTOM EFFECT
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WHETHER LED EMITS NOMINATED COLOUR ONLY?
A good quality LED emits nominated colour only.
There is very remote possibility that it may emits wrong colour if biased current changes.
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COMPONENT OF LED SIGNAL
FUSE LAMP CHECKING RELAY (ECR) HEALTH MONITORING UNIT (HMU) UNIVERSAL CURRENT
REGULATOR LED SIGNAL UNIT
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COMPONENT OF LED SIGNAL
Health monitoring unit
Lamp checking relay ECR Universal current regulator
LED signal lighting unit
Fuse
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FUSE TO BE USED WITH LED SIGNALS
Fuse shall be 0.63 Amps capacity.Whether fuse of 0.63 capacity is available in ND type open fuse?
ND type open fuse G type closed fuse
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HEALTH MONITORING UNIT
Front View
Rear View
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RELAY COMPATIBLE WITH LED SIGNALS
Any type of relay recommended (metal to carbon/ metal to metal )by Railway board can be useThere is a recommended ECR for LED signal The selection of jumper on the UCR shall be as per ECR used.
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Sr Nob
Type of ECR Make
Suitability with LED signal
P-up & DA current Relay ContactsMain
C-ON
Route
Shunt
ON-Metal to Metal M/s ABB YES YES - - 180&110 ma 3F/3B
OFF-Metal to Metal M/s Siemens YES YES
- - 145&62ma 3F/3B front 2,12,13
& back 3,4 ,14
ON-Metal to Carbon
M/s CGL
Company code
YES YES YES YES
180&110 ma4F/B, front A1/A2 to
D1/D2Back A3/A4 toD3/D4QECX51
M/s Hytronic
s
HRC-1 180&110 ma
4F/B ,front A1/A2 to D1/D2
Back A3/A4 toD3/D4HMCR-1
108/110ma
3F/3B ,Front A1/A2,D1/D2 &
D3/D4Back A3/A4, A5/A6
&D5/D6LED AC
ECR-Metal to carbon
-QECX61
YES YES YES YES 108 & 72 ma4F/B , front A1/A2 to
D1/D2Back A3/A4 toD3/D4
LED DC ECR-Metal to
carbon-
QECR2 YES YES YES YES 80 &55ma
4F/B , front A1/A2 to D1/D2
Back A3/A4 toD3/D4Conventional
ECR Rest conventional ECR are not suitable for LED signal
Reference RDSO Latter Nob .STS/E EL-LED Dated 02.06.2006
RELAYS TO USED WITH LED SIGNALS
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COMPONENT OF LED SIGNAL LIGHTING UNIT
Quality LEDs Sensors Poly-carbonet Dom
Power supply socket
Feed back socket
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INPUT POWER SUPPLY, OUT PUT & FUNCTIONS
• Input to all type of LED signal unit is ±25% of 110 volts DC and AC.
• Input to LED signal unit for main aspect is taken from O/P of current regulator.
• O/P is beam nominated colour (110 Lux for OFF aspect & 120 Lux for ON aspect).
• Also gives feed back about light O/P to current regulator if sensors are provided.
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INPUT POWER SUPPLY, OUT PUT & FUNCTIONS
Sr No LED signal unit FunctionIn put & connectio
nOut put
Minimum
Visibility
AC Immunity
AC I/P DC I/P
1
Main running signal
RED gives out red light beam
Optical output
Feedback to current regulator ( if sensors
are provided
DC & appro. 125% of Input of current regulator & current regulation ±2% & Direct
120 lux -
15% +25% 600Mts
AC noise immunity 60 Volts
300 volts AC
YELLOW gives out yellow light beam
GREENgives out
green light beam
110 lux -
15% +25%
2 Directional route indicator
gives out lunar white light beam
50 lux -15% +25% 400Mts
3 Calling ON signal gives out yellow light beam
50 lux -15% +25%
200Mts4 Shunt signal gives out lunar white
light beam 30 lux -15%
+25%
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FRONT VIEW ON ASPECT RED OFF ASPECT YELLOW OFF ASPECT GREEN
REAR VIEW
LED SIGNAL UNIT FOR MAIN SIGNALS
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WHETHER LED SIGNALS ARE AVAILABLE FOR MAIN SIGNAL ONLY ?
LED SIGNAL UNIT FOR ROUTE INDICATOR
LED SIGNAL UNIT FOR SHUNT SIGNAL
LED SIGNAL UNIT FOR CALLING ON SIGNAL
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FRONT VIEW CALLING ON SIGNAL ROUTE INDICATOR SHUNT SIGNAL
REAR VIEW
LED SIGNAL UNIT FOR SUBSIDIARY SIGNALS
WHETHER LED LIGHTING UNIT IS FOR MAIN SIGNAL ONLY?
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I/P POWER SUPPLY, O/P OF CURRENT UNIVERSAL REGULATOR
• Placed inside CLS unit.• I/P 110 ±20 volts AC/DC.• O/P 125% of I/P & always DC.• O/P Current regulation 2 %.
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Sr No
Universal current regulator for
In put per unit Out put Function
current volts
1 Main running signal
Separate fixed in
CLS unit
AC 125 ma ± 5%
DC 105 ma ± 5%
AC/DC 110
VOLTS ± 20%
DC approxim
ate 125% of
I/P & current
regulation margin
2%
Supply constant regulate current to LED SIGNAL UNIT
Scope for adjustment of circuit current to suite pick up current of ECR
Scope for adjustment to suite cascaded and non-cascaded aspect control circuit.
Regulates current as per feedback from LED signal unit
2 Directional route indicator
Inbuilt
AC 25 ma ± 5%
DC 23 ma ± 5%
3 Calling ON signal
AC 125 ma ± 5%
DC 105 ma ± 5%
4 Shunt signal
AC 125 ma ± 5%
DC 105 ma ± 5%
I/P POWER SUPPLY, O/P & FUNCTIONS OF CURRENT UNIVERSAL REGULATOR
Note – parameter as per specification RDSO/SPN/153/2002
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Sr No
Universal current regulator for
In put per unit Out put Function
current volts
1Main
running signal
Separate fixed in CLS
unit
AC 140 ma +10,-20 (rms)DC 125 ma
+10,-20 (rms)
AC/DC 110
VOLTS ± 25% DC
approximate
125% of I/P &
current regulation
margin 2%
Supply constant regulate current to LED SIGNAL UNIT
Scope for adjustment of circuit current to suite pick up current of ECR
Scope for adjustment to suite cascaded and non-cascaded aspect control circuit.
Regulates current as per feedback from LED signal unit
2 Directional
route indicator
Inbuilt
AC 25 ma ± 5%DC 23 ma ± 5%
AC/DC 110
VOLTS ± 20%
3 Calling ON signal
AC 150 ma +10,-20 (rmsAC 125 ma
+10,-20 (rms
4 Shunt signal
AC 55 ma ± 5%DC 50ma ± 5%
I/P POWER SUPPLY, O/P & FUNCTIONS OF CURRENT UNIVERSAL REGULATOR
Note – parameter as per specification RDSO/SPN/153/2004 effective from 1.1.2007
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PARTS TO BE REMOVED IN SIDE THE CLS LIGHTING UNIT
Transformer 110/12 Volts 40 VAMECR (If provided )Signal lighting unit Inner colour lens
Outer Clear lensLamp holderLampClamp
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PROVISION OF LED SIGNAL IN EXISTING FILAMENT LAMP CLS
• OUTDOOR ARRANGEMENT• Items to be removed from CLS unit:
– CLS Transformer & Lamp – MECR (if provided)– Lamp holder & clamp assembly – inner & Outer lens
• Items to be fitted:– Current Regulator – LED light unit
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• INDOOR ARRANGEMENT• Items to be removed/add from Relay room:• Check 110 AC fuse, shall be 0.6 Amps • ECR, if it is not as per RB guide lines• If required Aspect monitoring card per Aspect of
HMU
PROVISION OF LED SIGNAL IN EXISTING FILAMENT LAMP CLS
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PARTS TO BE REMOVED IN SIDE THE CLS LIGHTING UNIT
Signal lighting unit
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PARTS TO BE REMOVED IN SIDE THE CLS LIGHTING UNIT
Inner colour & outer clear lens
Lamp, holder & clamp
Signal transformer
MECR
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FIXING OF LED SIGNAL UNIT & UNIVERSAL CURRENT REGULATOR
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• Fuse of Aspect control circuit shall be 0.63 amps.• Existing ECR & shall be as RB guidelines.• Make the jumper settings on UCR & HMU to suite ECR.• The availability/non-availability of cascading in Aspect
control ckt.• Make the jumper setting (blanking/non-blanking) on UCR
accordingly.• Check whether HMU is in circuit OR bypass mode.
CHECKS- DURING REPLACEMENT LED SIGNAL IN EXISTING FILAMENT LAMP CLS