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 The benefits of ELV traffic systems Controller Signal heads Pedestrian street furniture Increased electrical safety Also potential for reduction in use of ladders Offered the first realistic opportunity for wide scale deployment of complete ELV systems ‘on-street’ Lower installation costs Delivered many benefits compared with existing LV solutions Reduced carbon footprint Page 2 April - 09 Often reduces significantly the number of street cables required Helios ELV signals consume 80% less power than their incandescent equivalents 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 UK / Industry / Mobility / Traffic Solutions 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% Facilitated the improvement of accurate lamp current monitoring Essential to cope with reducing LED signal powers Controller was also to be designed to be compliant with CLC / TS 50509 Page 4 Star Earth at controller Over current detection Residual current quench FET switch Dual channel current monitors Dual channel voltage monitors Repeated for each of 32 outputs per Lamp Switch -48V April - 09 UK / Industry / Mobility / Traffic Solutions 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 UK / Industry / Mobility / Traffic Solutions The benefits of compliance with CLC/TS 50509 33V Guaranteed Dim 27.5V Up to 250M in the ST900 ELV 15V Maybe Dim or Off Guaranteed Off LED signal limits as defined by CLC/TS 50509 Excessive cable run Maybe Bright or Dim 22V April - 09 Signal may dim incorrectly 38V Allows longer cable runs Page 6 Signal stays bright Guaranteed Bright 48V Long cable run This simple solution allows more voltage to be lost before the signals begin to experience false dimming 58V Signal stays bright 57% of bright supply compared to 66% Effects of excessive volt drop Short cable run CLC / TS 50509 sets a lower dim threshold than defined for LV based systems Supply voltage as seen by the LED signal UK / Industry / Mobility / Traffic Solutions 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 Growth of ELV systems (% of UK intersection controllers shipped as ELV) Actual 75% Forecast Forecast to continue But with no dedicated ELV Pedestrian Controller available, Traffic Managers have struggled to follow an ‘ELV only’ installation policy 50% 25% (Excl TfL) 06/07 07/08 08/09 09/10 Financial Year Page 7 April - 09 UK / Industry / Mobility / Traffic Solutions 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 Effect of development costs Example: Assume sales of 500 ELV pedestrian controllers per year: (Development costs to be recovered in three years) Example 1 Example 2 Development cost: £900K £300K Recovery per year: £300K £100K Additional cost per controller: £600 £200 Ensuring product reliability is not compromised by need to minimise costs Page 8 April - 09 UK / Industry / Mobility / Traffic Solutions 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 UK / Industry / Mobility / Traffic Solutions 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 UK / Industry / Mobility / Traffic Solutions 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 UK / Industry / Mobility / Traffic Solutions Standard Siemens LED signal Helios CLS with Lamp Monitoring Facility (LMF) Helios CLS with 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 LMF Module CLS Module Disadvantages Integral LMF adds cost LMF raises power consumption above basic LED levels Page 12 April - 09 UK / Industry / Mobility / Traffic Solutions The Siemens retrofit 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 Page 13 April - 09 UK / Industry / Mobility / Traffic Solutions The Siemens retrofit - Benefits Impact on controllers: Helios CLS (retrofit) 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 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 Indicative power consumptions Helios CLS (with LMF) Helios ELV Helios CLS Retrofit (2) Average power 21W 8W 9W Saving v High Intensity signals 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 Page 15 4 Phase 8 Phase Estimated annual power saving 2163 KWh 4328 KWh 9093 KWh Approximate annual carbon saving 1.2 Tonnes 2.4 Tonnes 4.9 Tonnes April - 09 12 Phase UK / Industry / Mobility / Traffic Solutions Summary 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……. Page 16 April - 09 UK / Industry / Mobility / Traffic Solutions ELV – The total solution? Copyright © Siemens plc 2009. All rights reserved.