HARTING’s Kevin Canham takes us through new connectivity solutions for rail applications. Stand E115 R
olling-stock manufacturers are facing a number of new challenges resulting
from the increasing number of electrical and electronic components that are being installed on board trains to meet customer expectations and exploit the capabilities of advanced technologies. The requirements of areas such as passenger information and entertainment, safety, automatic passen- ger counting and onboard computer sys- tems require a step function enhancement in connection technology to offer the ap- propriate combination of communication speed and functionality.
To meet the need for high-speed signal and data transmission, users have turned to Ethernet technology to deliver viable solu- tions. Trains are now using a central Eth- ernet ‘backbone’ which supports structured Ethernet networks and requires Ethernet switches to carry out the necessary routing.
The Ethernet backbone runs throughout the entire length of the trains, intercon- necting equipment such as CCTV cameras, video recorders, digital video encoders and LED system status displays. Typically, a fast Ethernet backbone using industrial 5- or 8-port Ethernet switches is installed on each train, with power supplied from a 110/24 V DC/DC converter. Frames from analogue cameras inside the train can be routed through digital video encoders and the Ethernet network to the digital record- ers. Additional information such as activa- tion signals from the emergency brake han- dles can also be sent to the onboard sys- tems over the Ethernet using unmanaged Ethernet switches and M12 connectors.
For the inter-car link in the Ethernet net- work, HARTING connector products such as Han-Modular®
, Han Quintax®
electromagnetic interference to be avoided between the power and signal lines, which are routed very close to one another. The EMI immunity of the HARTING system has been demonstrated during system testing.
Inter-car connection cables can be routed on the exterior or interior of rail vehicles. HARTING offers well-engineered systems for both situations. Cables that are routed externally must offer IP 68 protection. En- closed connector housings are not neces- sary on internal cabling, where the connec- tion between the cars is enclosed in a dia- phragm. HARTING has developed a spe- cial solution for these applications, which is based upon an ‘open’ Han®
24 HPR hood and which offers a number of advantages. and Han®
EEE inserts in HPR upper and lower hous- ings are typically fi tted onto the power and signal cables which are routed through rail approved fl exible conduits. In some cases, top-entry upper housings are used which mate with lower housings that are mounted on existing angle plates to optimise cable routing. The wires are sleeved inside the hoses to minimise the risk of abrasion. A rotating threaded conduit connection is used to accommodate the dynamics of the application.
In these applications, it is important for 122 | rail technology magazine Apr/May 11
In rail engineering, Ethernet connection technology faces challenges that are con- siderably tougher than those found in of- fi ce technology. Environmental infl uences and the added power transmission require- ments create unique challenges. These challenges have been addressed by a new industrial connector module – the Gigabit module - designed for applications involv- ing high data transfer rates in harsh envi- ronments. Protected by a die-cast metal housing, the new module allows signal and power contacts to be combined in the same unit and combines robustness with excel- lent transmission characteristics.
FOR MORE INFORMATION
The new module forms part of the Han- Modular®
industrial connector system, and joins a wide range of existing modules for
T: 01604 827500 E:
sales@harting.co.uk W:
www.harting.co.uk
electrical, optical and pneumatic signals. As an open connector system that is being continuously expanded, the Han-Modular® series allows customised connector con- fi gurations to be assembled to meet indi- vidual user requirements, and is proving invaluable in addressing the new and com- plex challenges of the rail industry.
HARTING was the fi rst company in the world to be awarded the relevant IRIS quality certifi cate: the leading interna- tional standard covering components for the rail industry. The company has also produced a detailed rail application guide in the form of a 244-page booklet: ‘HART- ING Users’ Guide: Transportation’, which covers all aspects of connectivity as applied to rail applications.
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