Siemens ST950 Handbook page 33

A basic controller with dimming is rated at 18W, 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 Controller
2 x Siemens SLD4 Detectors
Total Average Controller Power is:
Therefore, for the theoretical junction for a single 24 hour period:
151W for 12 hours – signals in bright
51W for 12 hours – signals in dim
30W for 24 hours – Undimmed Regulatory Sign
21W for 24 hours – Controller and Detectors
Total Average Junction Power Consumption per day is:
This is equivalent to an Average Power Consumption of: 152W
Note 1: The power used by the regulatory signs (which are not dimmed) for estimation
of running costs is approximately 30W. For fusing purposes the regulatory signs are
rated at 76 VA due to the inductive nature of the load they present to the supply.
Note 2: 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 3: 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 Generic code. The Elexon Home page can be found here:
http://www.elexon.co.uk/Pages/home.aspx
3.7.1 Detector Power Supplies
The Loop Detectors in the ST950 are all powered from 24V AC provided from either 2A
or 6A transformer depending on the number and type of Detectors fitted. The maximum
number of each type of detector that can be supported by each type of transformer is
shown in the table below.
Security classification
Version
Last Editor
Document Name
Copyright © Siemens plc 2015. All Rights Reserved.
Unrestricted
4
Paul Cox
ST950 General Handbook
Mobility Division, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
18W
3W
21W
1812Wh
612Wh
720Wh
504Wh
3648Wh
Page 33 of 107
Status Issued
Date 16-Jul-2015
Document No. 667/HB/46000/000
Mobility is a division of Siemens Plc