Digital Axle Counter CEL

 Axle counter is a device ,used to detect presence of train over on a specified portion of track.This specified portion can be any Platform line, Point zone area or Block section.

The digital axle counter produced by CEL is very popular in Raillway because it is easy to learn,Easy to maintain and easy in fault finding. It is widely called SSDAC in railway.I am giving block diagram of SSDAC below.



1)  In this system one set of axle counter is provided at Entry End and other set is provided at Exit End.Both sets are connected to each other through Quad Cable.Only two conductors of quad (Half Quad) are required.

Now I will tell you what are the components of one set of axle counter.

First part of SSDAC is TX and Rx coils mounted on rail.

Second part is SSDAC unit in the Location Box.



Third part is VR-PR Box in the Location near the SSDAC unit.It has two relays VR and PR.If the section is clear VR will pick up.VR relay will drop only when there is train in the section or SSDAC has failed due to any technical problem.

Fourth is Rest box in the ASM room.

In my next blog I will explain in detail about all the components of SSDAC. 

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