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Siemens CLS LED signal retrofit
Copyright © Siemens plc 2009. All rights reserved.
Content
LED signal retrofit
Introduction
 Background
 Standard Siemens LED signal
The Siemens retrofit solution




Scope
Benefits
Specific site examples
Availability and typical pricing
Questions
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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
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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
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Helios CLS with LMF
LMF Module
CLS Module
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How does the LMF work?
Controller lamp monitoring typically
uses the current consumed by a signal
to indicate if it is on
Current monitoring of incandescent
lamps
Lamp supply voltage
Most existing controllers are designed
to monitor incandescent lamps
 Current is sinusoidal and
predictable
Typical current
measurement points
 Of sufficient value to be easily
measured
To simplify hardware and software
current is measured at defined points in
the supply voltage waveform.
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Lamp supply current
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How does the LMF work?
LED signal currents are much lower
than for incandescent lamps
Current monitoring of LED signals
Current waveforms are often poor and
difficult to predict, particularly as the
supply voltage changes
Lamp supply voltage
 Cannot be monitored by standard
controllers
Typical current
measurement points
The LMF is a highly intelligent unit
which adds a current pulse to satisfy
the controllers expectations
LED supply current
Should the LED module (or LMF) fail,
all current is removed so that the
controller can sense the signal failure
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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
Helios CLS with LMF
LMF Module
CLS Module
Disadvantages
 Integral LMF adds significant cost
 LMF raises power consumption
above basic CLS LED levels
 Complicates retrofit on-street
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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
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The Siemens LED retrofit – Realised benefits
Reduced power compared with HI
signals and standard Helios CLS
Helios CLS (retrofit)
Fully RLM compatible and meets the
timing requirements of TR2210 and
TR2500
LMF Module no
longer needed
Can usually be added to existing
controllers without re-configuration
Updated
CLS Module
Retains excellent optical performance
delivered by Siemens Helios signals
Protects investment in existing installed
infrastructure
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Retrofit modules supplied
complete with new door, lens
and hoods
• Minimises installation time
• Ensures best possible
optical performance
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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)
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Detailed implementation considerations
The retrofit covers most ST800 and
ST900 (LV) sites fitted with Helios or
Peek Elite signal heads
The number of signals that can be
driven on each phase is less than
standard controllers
This retrofit facility is not available on
the ST700, ST750 ST800P or any
30A controller sites
Generally it is not necessary to reconfigure the controller
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
LED Near-Side Puffin / Toucan
LED Demand Indicators
 Changes to lamp monitoring
implemented by handset
command
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Signal Type
LED Wait Indicators
4*
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.
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Deciding which signals to upgrade
Lamp monitoring considerations influence the possible upgrade paths
Vehicle Signals:
Pedestrian Signals:
Helios Incandescent: Simple upgrade,
subject only to a limit of 8 signals per
phase.
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.
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.
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:
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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:
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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).
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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
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4 Phase
8 Phase
Estimated annual power saving
2121 KWh
4242 KWh
8970 KWh
Approximate annual carbon saving
1.2 Tonnes
2.3 Tonnes
4.8 Tonnes
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12 Phase
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Calculating your own power savings
Calculating site power savings is easy with
a simple spreadsheet tool.
 Also provides an indication of annual
carbon savings
Siemens LV retrofit power / carbon saving calculator
Enter number of HI signals
to be replaced
3 aspect
2 aspect
Single aspect
42
12
5
Power and carbon savings
Annual power consumption (KW/h)
Annual carbon contribution (Tons)
Overall annual savings
Dimming in use (Y/N)
Y
Power cost
(pence per unit)
12
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Annual power cost savings
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HI signals
19981
10.79
LED retrofit
4386
2.37
Power
(KW/h)
15595
Carbon
(Tons)
8.42
£1,871
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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
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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
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Summary
Questions……..
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Siemens CLS LV LED signal retrofit
Copyright © Siemens plc 2009. All rights reserved.

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