Last Editor Paul Cox - Siemens ST950 Handbook

Total Average Controller Power
Total average controller power is calculated as follows:
Average Controller power + Average Detector Power.
A low inrush ST950ELV controller is rated at 25W, and for the purposes of this
calculation Siemens SLD4 detectors require 1.5W per card. See section 3.6.1.
Therefore for our theoretical junction (Figure 5) the total average controller power is:
1 x ST950ELV Low Inrush Controller
2 x Siemens SLD4 Detectors
Total Average Controller Power is:
Therefore, for the theoretical junction for a single 24 hour period:
154W for 12 hours – signals in bright
51W for 12 hours – signals in dim
7W for 24 hours – Undimmed Regulatory Sign
28W for 24 hours – Controller and Detectors
Total Average Junction Power Consumption per day is:
This is equivalent to an Average Power Consumption of: 137.5W
Note 1: The controller power should also include any additional equipment supplied by
the controller. This may include, for example, OTU or Auxiliary detector power supply.
Note 2: Many customers may now prefer to use the Elexon codes for each individual
device within the site to determine power consumption for Billing purposes when using
an un-metered supply. Some older devices may not have an Elexon code in which
case there is a Genetic code. The Elexon Home page can be found here :
http://www.elexon.co.uk/Pages/home.aspx
The controller power should also include any additional equipment supplied
by the controller.
Security classification Unrestricted
Version 4
Last Editor Paul Cox
Document Name ST950 General Handbook
Copyright © Siemens plc 2015. All Rights Reserved.
Mobility Division, Traffic Solutions
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1848Wh
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168Wh
672Wh
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Page 52 of 107
Status Issued
Date 16-Jul-2015
Document No. 667/HB/46000/000
Mobility is a division of Siemens Plc
25W
3W
28W