2.  In signaling we use two different types of
sources i.e. DC & AC supply
 DC-supply
 All the interlocking circuits are powered
with DC supply.
 Every DC circuits are provided with
individual chargers and Batteries
 During power failures DC circuits are
continuously powered with individual
battery bank backup

3.  All the line side signals are fed through AC
supply
 During AC supply failure all the line side signals
will become blank.
 No solution is available to avoid blank signals
in the present signaling arrangement.
 As a rule if signals become blank treated as
defective signals. Which implies non-
interlocking of signaling system. Though the
interlocking is well intact.
 During blank signals due to AC supply failures
in the face of an approaching train can
create panic among the crews to control the
high speed trains

4. CONVENTIONAL POWER SUPPLY ARRANGEMENT OF
RAILWAY SIGNALLING
230V AC 230V AC 230V AC
BATTERY BATTERY BATTERY
CHARGER
110V
SP CHARGER SP CHARGER
12V
SP
24V
110V BATTERY 24V BATTERY 12V BATTERY
BANK BANK BANK
230V AC 230V AC 110V DC
CVT CVT
INV. INV.
SIGNALS
110V AC 110V AC 110V AC 110V AC
SIGNALS TRACK CIRCUITS

5.  To avoid these contingencies-
Un – interrupted power supply is required.
By this principle integrated power supply
system was developed i.e. complete
power solutions from one system to all
signaling circuits for a station

6. • Single battery bank is used
• 110V (55 nos of cells)/200 AH in RE ,300 AH in NON - RE
• To replace defective cells in the battery bank additional
1 05 Nos of cells are kept as spare cells.
• To charge the batteries SMPS based switch mode
rectifiers are used in parallel redundancy.
2
• To feed DC- supply to various circuits different
ranges of DC-DC converters are used.
3
• All the signals are powered by AC supply derived
from inverters with hot standby.
4 • All the field track circuits supply taken from main source
through CVT.

7. Pre-request items before planning
for IPS at stations
1. Ensure the availability of stable grid
supply minimum voltage of 200V-AC.
2. In RE-AREA ensure that 70sq.mm cable is
available between 10kVA AT transformer to
CLS panel to keep minimum voltage drop on
cable
(Ref: TI/PSI/Project/CLS/01 dt. 04.01.2002)
3. Measure the load currents of various DC &
AC circuits.
4. Pre-commissioning check list for IPS should be
followed .

8. SMR DC-DC converter Inverter CVT Transformer
110V- 24V - 32V/5A, 1.5kVA 1.5kVA 500VA
20A 12V-28V/ 5A 2.0kVA 2.0kVA 1kVA
12V-28V / 1A, 3.0kVA 3.0kVA
60V-66V/5A
12V-40V / 1A,
60V-110V/1A
3V-6V / 0.1A,
2V-12V / 5A
24V-32V/10A,
12V-28V/10A
24V-40V/10A,
12V-40V/10A

9. IPS Specifications – Revision History and
Improvements
Specification
Sl. No Features Added /Modified Advantages
N0
1 Amendment – 1 Introduction of SMPS based IPS
(Ver.1)
Achieved protection of IPS from
Introduction of LPD & SPD protections at heavy lightning & surges during
2 Amendment - 2
the I/P stage of IPS. raining season & improves the system
reliability.
3 Amendment - 3 New clause has been added to provide 1) Better heat dissipation . 2)
ventilation for individual modules. Reliability improvement.
4 Amendment - 4 * IPS cabinet dimensions have been
standardized.
* Ear thing guidelines are formalized. * Can avoid ear thing related issues
and improves overall system
reliability
* Pre-commissioning check list for Proper installation & commissioning
installation & commissioning of IPS has can be ensured.
been added.
* Over load & Over voltage protections, have Improves module and load reliability
been added for IPS system. as well.
5 Amendment - 5 *Class-’C’ protection is added in Data & Improves data & signaling loads
Signaling lines. reliability and power interruption to
the load is avoided.
*Guidelines given for Installation of LPD & Proper LPD & SPD co-ordination can
SPD Devices. be achieved,
9

10. Typical Block Diagram of IPS as per RDSO / SPN / 165 / 2004
150- 275V
AC TYPICAL BLOCK SCHEMATIC OF IPS AS PER RDSO/SPN/165/2004
AVR TRACK CIRCUIT UP
230/110V,500VA
230V AC BUS
1.0 KVA
LPD PANEL 230/110V,500VA TRACK CIRCUIT DN
CLASSINCOMING
-B&C BY PASS CVT TX 110V AC
230V AC AVR FUSE 1000VA 500VA TRACK
230V AC
BUS 230V AC BUS CKT.
SUPPLY STEP DOWN TRANSFORMERS
C
C 7
SMR CVT
1.5 KVA 7 TX 110V AC
110V/20A 1500VA230/110V,500VA
SMR (FRBC) INVERTER 500VA SIGNAL UP
C SIGNAL UP
110V/20A 110 V DC BUS 5
SMR 1.5 KVA INV 1 230/110V,500VA
STATIC SWITCH
1500VA C
110V/20A
FUSE FUSE TX 110V AC
110V/20A
SMR 500VA SIGNAL
1.5 KVA DN
INV 2 230/110V,500VA
FUSE
SMR
1500VA
230V AC BUS C
110V/20A 110V/20A SIGNAL DN
6
230/110V,500VA
110V/20A SMR
110V/20A 110 V BATTERY
ASM INDICATION PANEL
COLD STANDBY
COLD STAND BY LVDS
FUSE 110 V DC BUS FUSE
REMOTE
ASM
110V DC
DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC PANEL
DC-DC DC-DC DC-DC
C1 TO POINT
CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV
Battery 1 1 MACHINE
Set
110V/300AH
24-32V / LA
LM 5A-1No 24-32V/ 5A-2Nos 12-28V/ 5A-2Nos 12-28V/ 5A-2Nos 12-28V/ 5A-2Nos
24-32V/ 5A-4Nos BUS
110 V DC RELAY INT.
24-32V/ 5A-2Nos AXLE COUNTER PANEL IND. BLOCK LOCAL. Datalogger
RELAY INT. RELAYEXT-1.
(COLD STANDBY)
DC-DC DC-DC DC- DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC DC-DC
DC-DC
CONV
DC-DC
CONV
DC-DC
DC
DC-DC
CONV CONV
DC-DC
CONV
DC-DC
CONV
DC-DC CONV
DC-DC CONV
DC-DC CONV DC-DC CONV
DC-DC CONV DC-DC CONV
DC-DC CONV DC-DC DC-DC DC-DC FUSE
CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV CONV (20A)
CONV CONV CONV CONV CONV CONV
RELAY INTERNAL RELAY EXTERNAL PANEL INDICATION BLOCK LINE (UP) BLOCK LINE (DN) BLOCK LINE SICK CELL
24-32V/5A X 2 24-32V/5A X 2 & HKT 12-40V/1A X 2 12-40V/1A X 2 (BLOCK LOCAL) CHARGER
3-6V/12-28V/5A X 2
0.1A-2Nos 3-6V/ 0.1A-2Nos 24-32/ 5A-2Nos 24-32V/ 5A- 24-32/5A TO POINT
2-12V
12-40V/ 1A-2Nos 12-40V/ 1A-2Nos BLOCK TELE UP. BLOCK TELE DN. 2-12V/ 5A-2Nos 12-40V/1A X North
BPAC
2
2Nos 02 Nos MACHINE
BLOCK LINE UP. BLOCK LINE DN. FOR SPARE CELLS BPAC south Relay Ext-2

11. RDSO APPROVED FIRMS ARE
 M/S AMARA RAJA POWER SYSTEM
 STATCON POWER CONTROL SYSTEM
 HBL NIFE POWER SYSTEM

12.  IPS comes with three panels namely
1. FRBC or SMR panel
Five rectifier modules
Rated modules 110V-20A, 2.7kW
output of the panel is connected to battery
bank
and other panels
2. DC distribution panel
It can accommodate Max. of 39 converters
it consists of different rating of DC-DC
converters
3. AC distribution panel
Combinations of inverters, step-down
transformers and CVT

13. Layout of 3 Panels, Class ‘B’ Protection Box & ASM Box
ALL FAIL SIGNALS
I/P SUPPLY FROM
PANEL
Class ‘B’ ASM
Protection BOX
AUTO
C/O
SMR PANEL DC PANEL AC PANEL
Battery
LOADS

14.  System should be installed with sufficient
space at rear and front side minimum of
one meter.
 Keep the cabinets side by side with a
spacing about one foot between them
 Grout the cabinet to floor
 Draw the 10sq.mm copper wires from
IPS panels to power panel.
 Earthing of IPS

15. Earthing of IPS panel
 The Earthing Value should be less than 2 Ω as measured by megger.
 If the Megger is not available at site, then we should measure the N-
E Voltage of Mains Supply on class B protection Box. It should be less
than 5V.
SMR PANEL DC PANEL AC PANEL
MCD50-B MCD125-
FUSE VDE B NPE
32A/63A
X1 X2 X3 X4
L N N L
FROM TO
IPS
MAINS
CUSTOMER
EARTH
TYPICAL PROTECTION SCHEME SHOWING LIGHTNING &
SURGE PROTECTION AT INPUT OF POWER SUPPLY

16.  DC-DC converters, signal transformer voltages
should be adjusted to required voltages.
 According to load current, number of DC-DC
converters should be selected as N+1
redundancy. It means if any one converter fails
our circuit should not go to failure mode.

17.  DC CIRCUITS
 POSITIVE : RED , NEGATIVE :BLACK
 AC CIRCUITS
 PHASE : BLUE , NEUTRAL :YELLOW
 EARTH :GREY/GREEN

20.  FIXED AT ASM OFFICE.
 INDICATES HEALTHY OF COMPLETE IPS
SYSTEM.
 AFTER COMMISSIONING OF IPS. LETTER TO
BE SERVED TO ASM ,REGARDING SMP
WORKING TILL CORRECTION IS MADE IN
SWR.
 IN PANEL BLOCK TELE PHONE SUPPLY FOR
CONVERTERS ARE AVAILABLE.

21.  Start generator:
 50% DOD or Approx. 109V
 Emergency start generator:
 60% DOD or Approx 107V
 System shut down:
 70% DOD or Approx 105V
 Call S&T staff:
 Failure of FRBC, Converters, Inverters,
CVT’s & Transformers.
 PF contacts are available for DATA
LOGGERS.

23.  SMR Maintenance
 SMRs are fully alarmed and operate in an active loop
sharing arrangement. However , some regular checks can
be an early warning of problems waiting to happen.
 Current sharing (Applicable , when number of modules is
more then one number)
 Under normal conditions the currents contributed by every
rectifier should be within +/-2 Amps of each other. It is
possible however, for internal loop parameters to change
to such an extent that a unit does not share to the extent
that it should.

24. S No CHECK POINT ACTION REQUIRED FREQUENCY
1. Converter O/P Check if the O/P voltages are set as Once in 15
voltage per requirement. If not, correct them days
2. Paralleling of Switch OFF main Converter and Once in a
Converters observe if the stand-by is taking the month
load.
3. Paralleling of Switch OFF Stand-by Converter and Once in a
Converters observe if the main is taking the month
load.
4. Converter Check if all the converters are Once in 3
Mechanical inserted properly months
Alignment
5. Converter Cleaning Remove one by one and clean the Once in 3
converter using a soft cloth . Gently months
blow some air from top or Bottom to
remove the dust inside.

25. SNo Check Point Action Required Frequency
1. O/P voltages of Check if the O/P voltages are set Once in 15
Inverters, CVTs as per requirement. If not , check days
Step- Down for fuses
Transformers
contactors.
as per requirement
2. Inverter O/P current Check if the DPM is showing the Once in 15
signal current as per original days
settings.
3. Auto changeover Check for this changeover Once in a
between Inverters and operation as described in month
Bypass CVT instruction manual
4. Connector Mechanical Check if all the connectors of Once in a
Alignment various sub systems are month
inserted properly
5. Sub System Cleaning Remove one by one and clean Once in 3
them using a soft cloth . Gently months
blow some air to remove the dust
inside.

26. Low Maintenance Battery IRS 88/93
 Cleaning of all cells around top cover and terminals periodically.
 Applying petroleum jelly over the terminals.
 Periodically recording of all cell voltages and their specific gravity.
 Periodically checking of electrolytic level of cells.
 Periodically recording of all cell voltages with Battery Charger
switched OFF.
 Boosting of Sick cell using Sick cell Charger.
 Replacement of non-reparable cell in a bank by fresh charged cell.
Cleanliness
 Apart from these instructions regular cleaning of IPS and battery
room should be done. Cleaning of dust collected inside the IPS
panels (SMPS, DCDP & ACDP) should be done with the help of
blower once in a month.

27. EFFECT OF DUST ON WORKING OF IPS
Since IPS uses double side PTH PCB’s having high
component density and compact module construction
 It needs clean environment around it. It is true for any
modern electronic equipment.
• The floor should be pucca with mosaic/tiles or with
PVC flooring.
• There should be windows with glass doors so that they
can be closed.
• Doors and windows should have gaskets.
• There should be provision for exhaust fan and
dampers on outside.
• The windows should preferably have wire mesh or
Netlon type jali.

28.  Measure the voltage of each individual cell while
the battery is at REST.
 Variation of 0.05V between cells and variation of
20 points in the specific gravity indicates
imbalance in the bank. Battery bank needs
equalizing charge.
 In IPS equalizing charging can be done by
operating manual start EQ in CSU.

29.  HOUSED IN SMR
PANEL
 LVDS TRIP; 98 V
 TERMINALS SHOULD
BE SHORTED DURING
THE CONTACTOR
RELAY FAILURE

30. SLNO PROBLEMS ACTION TAKEN
1 CLS PANEL MCB TRIPPING SMR CURRENT LIMITED TO
MAX 10A
2 LVDS OPEN LVDS SHOULD BE IN AUTO
3 BLOCK TELEPHONE HEAVY DISCONNECTED BLOCK
HUMMING TELEPHONE CONVERTER
4 D2 SIGNAL BLANK,AND HOME AC SUPPLY FEEDING TO
SIGNAL FOR LOOP LINE NOT SIGNALS WERE EXTENDED
OBEYED ON IPS SUPPLY BACKUP TO D2’s AND HOME
SIGNAL ROUTE
INDICATORS.

31.  ELECTRONIC SWITCH MAY BE AVAILABLE PARALLEL
WITH LVDS TO MAKE USE IN EMERGENT CONDITIONS.
 UNIFIED CAPACITY OF CONVERTERS 12V – 32V/5 AMP
 HIGHER CAPACITY TRANSFORMER ,CVT
 REMOTE DIALINIG FEATURE MADE COMPULSERY.
 SUFFICIENT LENGTH OF CABLE TO BE MADE
AVAILABLE BETWEEN SMR TO BATTERIES.
 Cable entry hole to be provided on top of
modules.
 Extra converter slot made available in dcdp
for circuit expansion.