N KASHINATH CSTE/P/S.RLY. TPWS PROJECT Provided on Chennai Central/Chennai Beach - Gummudipundi...
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Transcript of N KASHINATH CSTE/P/S.RLY. TPWS PROJECT Provided on Chennai Central/Chennai Beach - Gummudipundi...
N KASHINATHCSTE/P/S.RLY
TPWS PROJECT
Provided on Chennai Central/Chennai Beach - Gummudipundi section of Chennai division
Section length- 50 RKMs
Date of commencement- 24.02.05
Date of commissioning- 02.05.08
Total EMU rakes covered- 41 rakes
TPWS BENEFITSEnsures safe movement of trains under
its supervision
Prevents over-running of the movement authority (MA)
Automatically brings the speed of train within permitted limits in case of over speeding
Prevents train from entering danger zone if the driver fails to control while approaching a ‘RED’ signal.
e
JB
e
Switchable Balise
e
Fixed Balise
JB
LEU Cabinet
Existing Signal
Location Box
A
CO
TRACK-SIDE EQUIPMENT LAYOUT DIAGRAM
Infill Balise
Existing SignalNoteJB-Balise Junction BoxLEU-Lineside Electronic Unit Not to scale
Data Cable
OBC
BTM Brake Valves
On Board-Cubicle
Wheel Sensor
JB Wheel Sensor
JB
Antenna
ON BOARD EQUIPMENT LAYOUT DIAGRAM
OBC-On Board ComputerBTM-Balise Transmission Module
JB-Junction Box
DMI
RE-TRAINING OF MOTORMEN
• After commissioning a second round of training organised for improving their confidence
• New motormen were also covered
• Operating instructions of TPWS to motormen revised and made more comprehensive
PERFORMANCE MONITORING
Ansaldo staff stationed at both ends of the section
To ensure switching ON of TPWS
Monitoring condition of TPWS at commencement and end of journey
Motormen recording en-route failures in the EMU log book for onward transmission to TPC.
FAILURE ANALYSIS• On-board computer logs periodically
downloaded
• Logs analyzed using specially developed sorting software
• Problem noticed on Track-side and On-board system solved to the extent possible
• Track-side system became fully stable
ON-BOARD PROBLEMS PENDING RESOLUTION
On-board system sometimes not booting
System Failure (SF) sometimes while booting
SDMI on the run sometimes going blank
Brake application due to speed bouncing on SDMI
Brake application in the non-driving rear motor coach
MITIGATING UNRESOLVED PROBLEMS
• Experts called from Ansaldo France, Australia, Italy and Hong Kong
• They carried out detailed observations in field
• Error logs of OBC studied
• Error logs sent to their countries for analysis by specialists
CAUSES IDENTIFIED
BTM-Antenna communication failureError in Train Interface Unit (TIU)Error in Odometric (speed sensing)
systemBack EMF from Electro Pneumatic (EP)
brake relay and solenoid valve coilsBugs in SDMI software and hardware in-
adequaciesRear coach on-board system getting shut
down during run in Sleep Mode
BTM-ANTENNA COMMUNICATION FAILURE
• Due to antenna impedance mismatch
• Standing Wave Ratio (SWR) found more than the tolerance limit of 1.2 to 1.4
• Interference from EMI
CORRECTIVE ACTION• Antenna protection cover modified
• BTM to Antenna Tx/Rx cables shielded with copper braids firmly connected to body
• PROFIBUS and CTODL cables between OBC & BTM shielded with copper braids
• BTM configuration files modified
TRAIN INTERFACE UNIT ERROR
• Communication problem between CBOP and MTORE cards in OBC
• Noise/Ripples in the 110V DC supply to OBC from the EMU battery
• Causing intermittent on-board system failure
CORRECTIVE ACTION
Cables between CBOP and MTORE cards changed to screened twisted pair cables
Power filter provided at the input of 110V DC to OBC
All OBC rack wiring changed as per modification plan sent by Ansaldo, France
ODOMETRIC SYSTEM ERROR
• Interference from EMI
• TPWS traction control relay generating wide spectrum of noise
• High resistance between EMU body and the bogie
CORRECTIVE ACTION
Cable between OBC and Speed sensor shielded with copper braids firmly connected to body
TPWS traction control relay shifted outside OBC cubicle
EMU body to bogie firm connection provided
BACK EMF FROM EB VALVE AND EP RELAY COILS
• EB and SB relays found affected by EMI
• Back EMF of EB solenoid valve coil and EP brake relay coils found high
• Problem became more acute during braking
CORRECTIVE ACTION
• EB solenoid valve coils terminated with 180/200V MOVRs
• EB & SB relay bodies firmly connected to EMU coach body
• Surge suppressor provided at the EP brake coil
BLANKING OF SDMI ON RUN
Basic hardware and software inadequacies
Residual bugs in SDMI software
Interference from EMI
Ripples in 110V DC input power supply
CORRECTIVE ACTION
SDMI software upgraded to next higher version v1.6.4
OBC-SDMI communication cable connector cover changed from plastic to metallic
OBC-SDMI and SDMI power supply cables shielded with copper braids firmly connected to coach body
Power filter provided at the SDMI-110V DC input point
REAR COACH ON-BOARD GETTING SHUT DOWN ON RUN
• Due to errors in various subsystems the on-board gets shut down.
• On-board shutting down activates EB command
CORRECTIVE ACTION
• Brake interface circuit modified to bypass EB command in Sleep Mode.
• Prevent the On-Board in sleep mode from getting shut down by the modifications discussed earlier.
PLAN OF ACTION FOR MODIFICATIONS
• One by one motor coach to be taken OFF service & handed over to Ansaldo
• Initially 4 coaches were got modified
• Their performance closely monitored for 4 weeks
• Found substantial improvement in performance of these 4 coaches
PLAN OF ACTION FOR MODIFICATIONS…contd
Balance coaches also decided to be modified
Ansaldo initially took 3-4 days for modifying a coach
Ansaldo asked to reduce it to 2 days by working in two shifts
17 coaches modified till date
EXPECTATIONSMost of the coaches are expected to be
modified by 31.05.2010
Improved performance levels expected to meet the operational requirements
Could lead to acceptance of TPWS for safe running of EMUs
Top management requested to be patient for the results