ELV – The total solution?

Copyright © Siemens plc 2009. All rights reserved.

The growth of ELV traffic systems

ST900 ELV system launched to great acclaim at Traffex 2007  Controller   Signal heads Pedestrian street furniture Offered the first realistic opportunity for wide scale deployment of complete ELV systems ‘on-street’ Delivered many benefits compared with existing LV solutions

The benefits of ELV traffic systems

 Increased electrical safety  Also potential for reduction in use of ladders  Lower installation costs  Often reduces significantly the number of street cables required  Reduced carbon footprint  Helios ELV signals consume 80% less power than their incandescent equivalents Page 2 April - 09

UK / Industry / Mobility / Traffic Solutions

ST900 development challenges

The ‘ELV Project’ started over two years earlier in 2005 Was initially intended to be just a minimal update to the ST800  Simply change the lamp switches to work at 48V!

Detailed research showed that this would not yield the best solution  Voltage losses in the system would limit street cable lengths  Future reduction in LED signal power would be difficult to manage Page 3 April - 09

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ST900 development challenges

A new concept was needed, resulting in a revolutionary design employing a ‘DC’ lamp supply

ELV drive and monitor schematic

Enabled the use of FET switches  Reducing variable voltage loss in the controller by 80% Star Earth at controller Facilitated the improvement of accurate lamp current monitoring Over current detection  Essential to cope with reducing LED signal powers FET switch Controller was also to be Dual channel current monitors designed to be compliant with -

48V

CLC / TS 50509 Residual current quench Dual channel voltage monitors Repeated for each of 32 outputs per Lamp Switch Page 4 April - 09

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The benefits of compliance with CLC/TS 50509

Unlike incandescent lamps, modern LED signals are very tolerant of varying supply voltages  Light output is maintained over very large voltage swings But they have a defined voltage at which they will switch to dim Signals may incorrectly switch to dim if their supply voltage falls too low!

 During times of low mains supply coupled with long cable runs Page 5 April - 09

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The benefits of compliance with CLC/TS 50509

CLC / TS 50509 sets a lower dim threshold than defined for LV based systems  57% of bright supply compared to 66%

58V 48V

This simple solution allows more voltage to be lost before the signals begin to experience false dimming  Allows longer cable runs  Up to 250M in the ST900 ELV

38V 33V 27.5V

22V 15V Effects of excessive volt drop

Guaranteed Bright Maybe Bright or Dim Guaranteed Dim Maybe Dim or Off LED signal limits as defined by CLC/TS 50509 Guaranteed Off Supply voltage as seen by the LED signal Page 6 April - 09

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The growth of ELV traffic systems

The technical innovation embodied in the ST900ELV has proved to be highly successful Growth in demand has been outstanding  Forecast to continue But with no dedicated ELV Pedestrian Controller available, Traffic Managers have struggled to follow an ‘ELV only’ installation policy

50% 25% Growth of ELV systems (% of UK intersection controllers shipped as ELV) 75%

Actual Forecast

06/07 07/08 08/09

Financial Year (Excl TfL)

09/10

Page 7 April - 09

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Challenges creating an ELV pedestrian controller

Price pressure in the stand-alone pedestrian market  Must be cost effective but still offer the full range of ELV benefits  Both product and development costs must be considered Maintaining support for both LV and ELV solutions Ensuring product reliability is not compromised by need to minimise costs

Effect of development costs Example:

Assume sales of

500

ELV pedestrian controllers per year: (Development costs to be recovered in three years) Development cost:

Example 1

£900K Recovery per year: £300K

Additional cost per controller: £600 Example 2

£300K £100K

£200

Page 8 April - 09

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The Siemens solution – The ST750 family

Offers LV/ELV mix (as per ST700) and also a complete ELV solution In common with the ST900, the ST750 family is provided in two distinct TR2500 compliant types  ST750  ST750 ELV ST750 is based on the ST700 ST750 ELV uses the latest ELV technology employed in the ST900 ELV Page 9 April - 09

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The ST750 ELV

The benefits of the Siemens ST900 ELV traffic system

 Built in lamp monitoring including nearside and LED wait indicators  ‘DC’ drive with advanced switching supporting extended cable runs  Support for very low power signals  Electronic protection of all outputs to minimise damage in the event of cable faults Page 10 April - 09 New cabinet layout, building on the success of the ST900ELV  Both small and large sizes available Offers all the same benefits as the ST900ELV Retains familiar IC4 configuration tool  Newly upgraded to include many new emulation features You can see the ST750 ELV controller and the new IC4 system on the Siemens stand C10

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ELV – The total solution?

ELV can now be total solution for new installations  Will deliver greater safety, lower installation costs and reduced carbon footprint But there are thousands of sites installed using LV incandescent signals  Much of this installed equipment is still serviceable  The cost of mass upgrade may be difficult to justify The benefits of lower running costs and reduced carbon footprint can still be achieved with the new Siemens Helios retrofit solution Page 11 April - 09

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Standard Siemens LED signal

Helios CLS with Lamp Monitoring Facility (LMF) Benefits:  Robust Helios signal body   SIRA high phantom lens Lamp monitoring compatibility with all Siemens controllers  Reduced power compared with standard high intensity signals Disadvantages  Integral LMF adds cost  LMF raises power consumption above basic LED levels Page 12 April - 09

Helios CLS with LMF LMF Module CLS Module UK / Industry / Mobility / Traffic Solutions

The Siemens retrofit

Page 13 April - 09

Objectives

Eliminate the need for the LMF unit  Reduces cost  Reduces power consumption Provide effective retrofit kits for existing Helios signals  LV and ELV options

(Option for Peek Elite being considered)

Be fully compatible with ST800 and ST900 intersection controllers

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The Siemens retrofit - Benefits

Impact on controllers:  New lamp switch cards  New firmware Benefits:  Able to be added to existing controllers without re-configuration  Retains all benefits of the existing Helios traffic signals  Protects investment in installed infrastructure  Fully RLM compatible and meets the timing requirements of TR2210 and TR2500  Reduced power compared with HI signals and standard Helios CLS Page 14 April - 09

Helios CLS (retrofit) LMF Module no longer needed Updated CLS Module Retrofit modules supplied complete with new door, lens and hoods

•

Minimises installation time

•

Ensures best possible optical performance UK / Industry / Mobility / Traffic Solutions

The Siemens retrofit – potential power savings

Average power Saving v High Intensity signals Indicative power consumptions Helios CLS (with LMF) Helios ELV Helios CLS Retrofit (2) 21W 8W 9W 50% 80% 78% Typical Junctions annual power saving – compared with High Intensity signals Large site – 30 x 3 aspect heads, 6 x single aspect arrows Medium site – 14 x 3 aspect heads, 4 x single aspect arrows Small site – 7x 3 aspect heads, 2 x single aspect arrows Estimated annual power saving Approximate annual carbon saving 4 Phase 8 Phase 2163 KWh 1.2 Tonnes 4328 KWh 2.4 Tonnes 12 Phase 9093 KWh 4.9 Tonnes

Page 15 April - 09

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Summary

Page 16 April - 09 ELV is the ideal solution for new installations For existing sites, significant carbon savings can be achieved by upgrading to LED signals using the Helios retrofit option Together these two solutions offer real opportunities for significant power and carbon savings

Questions…….

UK / Industry / Mobility / Traffic Solutions

ELV – The total solution?

Copyright © Siemens plc 2009. All rights reserved.