copyright © siemens plc 2009. all rights reserved. siemens cls led signal retrofit

Copyright © Siemens plc 2009. All rights reserved.

Siemens CLS LED signal retrofit

November-09 Traffic Solutions

Content

LED signal retrofit

Introduction Background Standard Siemens LED signal

The Siemens retrofit solution Scope Benefits Specific site examples Availability and typical pricing

Questions


Background

For new installation ELV is usually the best solution

Will deliver greater safety, lower installation costs and reduced carbon footprint compared to LV

However, there are thousands of sites already installed using LV incandescent signals

Much of this installed equipment is still serviceable

The cost of mass upgrade to ELV may be difficult to justify

The Siemens LED signal retrofit offers a cost effective solution to achieving lower running costs and reduced carbon footprint on many incandescent sites


Helios CLS with LMF

Standard Siemens CLS 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

HI signals

CLS Module

LMF Module


How does the LMF work?

Controller lamp monitoring typically uses the current consumed by a signal to indicate if it is on

Most existing controllers are designed to monitor incandescent lamps

Current is sinusoidal and predictable

Of sufficient value to be easily measured

To simplify hardware and software current is measured at defined points in the supply voltage waveform.

Lamp supply voltage

Current monitoring of incandescent lamps

Lamp supply current

Typical current measurement points


How does the LMF work?

LED signal currents are much lower than for incandescent lamps

Current waveforms are often poor and difficult to predict, particularly as the supply voltage changes

Cannot be monitored by standard controllers

The LMF is a highly intelligent unit which adds a current pulse to satisfy the controllers expectations

Should the LED module (or LMF) fail, all current is removed so that the controller can sense the signal failure

Lamp supply voltage

Current monitoring of LED signals

Typical current measurement points

LED supply current


Helios CLS with LMF

Standard Siemens CLS 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 HI

signals

Disadvantages Integral LMF adds significant cost LMF raises power consumption

above basic CLS LED levels Complicates retrofit on-street

CLS Module

LMF Module


The Siemens LED retrofit - Overview

Provides effective retrofit kits for existing incandescent signals

Helios Peek Elite

Eliminates the need for the LMF unit but retains full lamp monitoring facilities

Reduces cost Reduces power consumption

Is fully compatible with ST800 and ST900 intersection controllers


Helios CLS (retrofit)

The Siemens LED retrofit – Realised benefits

Reduced power compared with HI signals and standard Helios CLS

Fully RLM compatible and meets the timing requirements of TR2210 and TR2500

Can usually be added to existing controllers without re-configuration

Retains excellent optical performance delivered by Siemens Helios signals

Protects investment in existing installed infrastructure

Updated CLS Module

LMF Module no longer needed

Retrofit modules supplied complete with new door, lens and hoods

• Minimises installation time

• Ensures best possible optical performance


The Siemens retrofit in detail

New retrofit LED modules in signal body doors for:

Siemens Helios Peek Elite

Replacement lamp switch cards

Retrofit upgrade kit for ST800 and ST900 controllers

ST800 Firmware (PB800 issue 26*)

Filter kit

ST900 Firmware (PB801 issue 8*)

(PB815 issue 4*)

(*or later version)


Detailed implementation considerations

The retrofit covers most ST800 and ST900 (LV) sites fitted with Helios or Peek Elite signal heads

This retrofit facility is not available on the ST700, ST750 ST800P or any 30A controller sites

Generally it is not necessary to re-configure the controller

Changes to lamp monitoring implemented by handset command

The number of signals that can be driven on each phase is less than standard controllers

Signal Type Number of signals per phase

Helios CLS (NLM) Includes Vehicle and far-side Ped & Cycle Signals

8

Incandescent / Filament lamps 4*

Helios LED (old style LED) 4*

Helios CLS+LMF 4*

LED Near-Side Puffin / Toucan

LED Demand Indicators

LED Wait Indicators

These signals cannot be lamp monitored, but the

number of driveable signals is the same as for

standard controllers.

* For pedestrian signals with Wait indicators, this limit of 4 signals would normally consist of two reds and two waits.


Deciding which signals to upgrade

Vehicle Signals:

Helios Incandescent: Simple upgrade, subject only to a limit of 8 signals per phase.

Helios LED*: Simple upgrade, subject only to a limit of 8 signals per phase.

Helios CLS + LMF: Simple upgrade, subject only to a limit of 8 signals per phase.

Pedestrian Signals:

Near-Side Pedestrian Signals: No need to upgrade – already LED based and should left in place. These units cannot be lamp monitored by any existing or new LV controllers.

Far-Side Pedestrian Signals: The upgrade options are more complex and are determined by the presence of wait indicators and the desire to lamp monitor them.

* Old style with many discrete LEDs:

Lamp monitoring considerations influence the possible upgrade paths


Deciding which signals to upgrade – Pedestrian options

Option 1: Upgrade the red and green men and fit LED wait lamps.

In this arrangement lamp monitoring of the waits is not possible, and neither is monitoring of the pedestrian red whilst the wait signal is illuminated.

LED wait lamps are not monitorable by the controller, but offer low lower power consumption and reduced maintenance compared to their incandescent equivalents.

Option 2: Upgrade the red and green men and continue to use incandescent wait lamps.

Without re-configuration lamp monitoring of the waits is not possible, and neither is monitoring of the pedestrian red whilst the wait lamps are illuminated.

However reconfiguring the controller and the use of external toroidal current sensors will remove these limitations if lamp monitoring of the incandescent waits is still required

* Old style with many discrete LEDs:


Deciding which signals to upgrade – Pedestrian options

Option 3: Where only far sides signals and two incandescent waits are present, replace the Helios incandescent signals with Helios CLS + LMF.

In this arrangement lamp monitoring of both the LED signals and incandescent waits is possible without re-configuring the controller (as they both continue to look like incandescent signals to the controller!).

This is not a preferred option as it means a mix of standard Helios CLS + LMF and Helios NLM signals on the same site.

However it provides a solution where monitoring incandescent wait indicators is desired and a controller reconfiguration is not desired.

If the site to be upgraded has other signal arrangements, upgrade may still be possible with a controller re-configuration. Full details of all the possible signal

upgrade options that can be attained are to be found in section 5 of the product handbook (667/HB/32921/007).


The Siemens retrofit – potential power savings

Average power

Saving v High Intensity signals

21W

50%

8W

80%

9W

78%

Indicative power consumptions

Helios CLS(with LMF)

Helios ELVHelios CLSRetrofit (2)

Estimated annual power saving 2121 KWh 4242 KWh 8970 KWh

Typical Junctions annual power saving – compared with High Intensity signals

Small site – 7x 3 aspect heads, 2 x single aspect arrows

Medium site – 14 x 3 aspect heads, 4 x single aspect arrows

Large site – 30 x 3 aspect heads, 6 x single aspect arrows

4 Phase 8 Phase 12 Phase

Approximate annual carbon saving 1.2 Tonnes 2.3 Tonnes 4.8 Tonnes


Calculating your own power savings

Calculating site power savings is easy with a simple spreadsheet tool.

Also provides an indication of annual carbon savings

HI signals LED retrofit3 aspect 42 Annual power consumption (KW/h) 19981 43862 aspect 12 Annual carbon contribution (Tons) 10.79 2.37Single aspect 5

Power(KW/h)

Carbon(Tons)

Dimming in use (Y/N) Y 15595 8.42

Power cost(pence per unit) 12 Annual power cost savings

Siemens LV retrofit power / carbon saving calculator

£1,871

Enter number of HI signals to be replaced

Power and carbon savings

Overall annual savings


Availability and pricing

Helios retrofit modules are available immediately

Peek Elite retrofit modules will be available from March 2010

Installed price typically around £375*

Volume discounts achievable

5 year warranty

ST900 LED controller available which will directly drive and monitor Helios LED signals without LMF modules

For site / scheme specific pricing talk to your Regional Sales Manager

* 3 Aspect Signal


Summary

The Helios retrofit solution offers options for cost effective LED retrofits into existing signal heads

Uses high quality LED modules and signal head components

Offers significant power savings and carbon footprint reductions compared with traditional incandescent signals

Is fully RLM compatible Meets the requirements of

TR2210 and TR2500


Summary

Questions……..

copyright © siemens plc 2009. all rights reserved. siemens cls led signal retrofit

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