ALL ABOUT POSITION OF AXLE COUNTER TRACK DEVICES

         Main component of Axle Counter is track devices which detect the movement of train wheels over it.

Now the first question is where should  we fixed this device if we are using it for Block Proving    ( Along with UFSBI or BPAC).You will not get the answer of this question in any book.

One thing is clear, it must be between Advance Starter and Home Signal.First find out  Block Overlap of that station.For Colour light signalling,block overlap is 180m.

Therefore we will measure 180m from Home Signal towards station and mark the position for installation. While marking this position make sure that Axle detectors should be at least 13 m from Advance Starter towards HOME SIGNAL so that Axle counter fail whenever Train crosses ADVANCE STARTER and enter Block Section.


CONCLUSION- Axle detectors must be placed between HOME SIGNAL and opposite ADVANCE SIGNAL at a distance 180 m from HOME SIGNAL and 13m from ADVANCE SIGNAL.


Please remember following things
1) Install these devices on same rail on both stations.
2) Sleepers must be properly packed with ballast where Axle detectors are fixed.
3) Rail must not worn out , where we are fixing Axle detectors. 
4) For making holes in rail, please use standard Zig, supplied from CEL company. Please do not use any local Zig otherwise you will be inviting failures.

There are two sets of transmitter and receiver coil. First set is made of 21 khz and second set is made of 23 khz. Please make sure that 21 khz transmitter is facing to 21 khz Receiver and 23 khz transmitter to 23 khz Receiver.


So there are Two transmitter coils and two receiver coils.Cables coming out from these coils will be terminated in the Full location box.Length of each cable is 10m and this cable is called Shielded Cables.


This location box should be installed as close as possible to track devices. This distance should not be more than 10 m.       I will discuss colour coding of these cables in my next post.


Four things you must ensure that while carrying these cables to location box.


1) Both the transmitter cables must be in one HDPE Pipe and both the Receiver coils must be in another HDPE pipe.
2)  Distance between  These pipes must be at least 400 m.
3)  Cables should be straight in HDPE pipe.
4) Extra cables coming from detectors should be made of zig zag shape and it should be kept inside Location Box.


If you follow these things in installation, there are less chances of failure.


This system will detect the wheel with diameter greater than 400 mm and standard wheel flange.Please remember both Diameter of wheel and length of wheel flange must be in exact range, then only Axle detectors will detect wheel.


For push trolley, if the length of wheel flange is less than 22 mm.  Detectors will not detect and your Axle counter will not fail from push trolley.( Which is required)


If your Axle counter if failing from PWAY trolley,  measure length of flange of trolley and advice them to cut flange and make it less than 22 mm. This will reduce your failure.


Rail Deflector- To protect the detectors from any damage from hanging part of train, rail deflector plates are mounted on both sides of Axle detectors.  Distance between Axle detectors and deflector plates should be 30 cm to 40 cm and these plates must be installed between two sleepers.









In my next post I will discuss more about CEL SSDAC.You can post me any of your queries about signalling.I will definitely answer.

Comments

Post a Comment

Popular posts from this blog

CRS , CST and PCE sanction

  Validity of CST sanction   is six months .Required when we are doing any changes in existing interlocking.e.g commissioning of BPAC Validity of CRS and PCE sanction are same (01 year). PCE sanction is required only for closing the LC gate.Earlier it was with CRS, now delegated to PCE. ESP,SIP,SWRD,PD and SWR required to be attached with PCE sanction.  CRS sanction is must when do any change in interlocking,e.g.any new line is opened. Validity of CRS sanction is 01 year. CRS permission is required in following cases. a) Additions/extensions or alterations to the existing block, Signalling and interlocking installations b) Change in Block, Signalling and Interlocking installations. c) New stations temporary or permanent. d) Interlocking of level crossings, catch siding and slip sidings etc. CST Sanction   CST Sanction required in following works 1) Provision of Telephone at already Manned level crossings. 2) Provision of electrical & mechanical lifting barrier including emergency
Read more

Railway Establishment and Stores

  Max LAP approved one time - 180 days .( if available in his account). Max LHAP approved one time - 24 months ( if available in his account). Leave not due - Max 360 days in service. Can be sanctioned on medical grounds  Compensatory casual leave granted to Group C &D employees other than supervisory staff for attending on Sundays and holidays. Special casual leave    It is sanctioned for participation in sporting events/events of national importance,for scouting duties and family welfare. Special casual leave can be granted in following cases. Administration of operative society members. Participation in scouts . Participation in sports activities  Participation in railway union activities etc In bandh,curfew and national calamity. A railway Servant,who has taken CL for half a day on the afternoon of a working day due to unexpected sickness or compelling grounds and he has no CL at his credit, may as an exception to general rule,be permitted to combine half a day’s CL with regu
Read more

Telecom

                                                    Basics of Telecom Mobile Communication   Emergency Communication  Emergency Communication is provided by following means a) Emergency Socket b) 5/25 Watt VHF sets c) GSM - R ( very less percentile) d) Mobile phones available with driver, guard and staff. Disadvantage of above mode of Emergency Communication - Section controller is not able to contact train crew in moving train It can be initiated only in static condition SOS facility is not available Weight of emergency control phone is fairly heavy. GSM - R is used at very less percentile. To avoid these Shortcoming MTRC ( Mobile train radio communication) is implemented. Accidents, unusual situation, robbery in train, Locomotive failure and chain pulling etc. Features of MTRC  - Driver to Control Guard to Control Driver to station master Driver to guard Guard to train crew Train crew to gateman of gates enroute. MTRC uses GSM-R technology. MTRC has been designed on EIRENE ( European
Read more