SELLA CONTROLS wins a contract from ESG Rail for the provision of a device that physically prevents the over-speeding of trams

SELLA CONTROLS have been awarded a contract from ESG Rail, who has been contracted to develop, supply, install and commission a physical prevention of overspeeding (PPOS) device for the London tram fleet. This protection system will operate independently of the other tram monitoring systems and will stop a vehicle if it is found to be travelling at excessive speed within pre-defined locations.

Transport for London (TfL) began work on the feasibility of introducing this new safety measure, which has not been introduced on any UK trams before, shortly after the tragic overturning at Sandilands, Croydon, in November 2016. It is one of the recommendations set out by the Rail Accidents Investigation Branch (RAIB) following the tragic tram overturning and is expected to be fully operational by the end of 2019.

SELLA CONTROLS will provide the equipment necessary for the PPOS system to be installed on all of London’s trams. The system consists of a PPOS controller (EKE Trainnet) fitted to each tram, together with a Tracklink III Reader. Tracklink III beacons will initially be installed at a select number of high risk areas on the routes but will have the flexibility to be introduced elsewhere on the network.

In the event of a tram over speeding in a speed restricted area, the PPOS controller will interrupt the power to the PPOS safety relay. This will result in full service brake application and will bring that vehicle to a controlled stand-still.  This event will be alarmed at the London Tram control room via 3G/4G connection. SELLA CONTROLS will be providing the server and workstation for handling the alarms and storing the data. In addition SELLA CONTROLS are also responsible for providing a new Depot Wi-Fi system which will be used to download PPOS data from each tram as it enters the depot.

Mark Davis, TfL’s General Manager of London Trams, said: “We will never forget the tragedy at Sandilands and from day one have focused our attention on preventing this type of incident from ever happening again. Awarding the contract for a new automatic braking system Is a first for trams in the UK, and not only will it improve safety for customers in London, but we hope it will lead the way for other tram operators across the country. We will work hard this year to have the new system, which will automatically apply the brakes if a tram is exceeding the speed limit, in full operation by the end of this year.”

SELLA CONTROLS to supply a new PLC control system for Locomotives at British Steel’s Scunthorpe site

SELLA CONTROLS is pleased to announce that we have recently been awarded a contract by British Steel to design and supply a new PLC control system for the Hunslet Shunting Locomotives at its Scunthorpe site.

SELLA CONTROLS have a long association with these locomotives. In 1990 we supplied a fail-safe radio control system to RFS Engineering who had the contract to convert the locomotives to radio control operation. As part of this contract a Square-D SY/MAX PLC was installed for interfacing the radio control and manual controls to control the loco. Some 10 years later, in 2000, SELLA CONTROLS won a contract from British Steel to upgrade the radio control system and extensively re-program the Square-D PLC for new control functions.

The Square-D PLC has become impossible to maintain and repair as it has been obsolete for many years. As part of this contract SELLA CONTROLS will be replacing the Square-D PLC with a Siemens S7 PLC and will be providing new functionality including event recording.

The contract is for the supply, design and integration of the S7 PLC and wiring plus new software for the first loco. Providing it all goes well there will be further orders as British Steel slowly upgrades its other Hunslet locos.

 

Happy New Year

In 2019 SELLA CONTROLS celebrate 45 years of being ‘In Control’ with the issue of new jackets to all staff.