Siemens ST950 Handbook page 25

4.1.1 Regulatory Signs Monitoring
The controller comes equipped and wired with a lamp monitoring sensor as
standard that can monitor up to seven fluorescent tube regulatory signs. If the
junction contains more than seven signs in total, additional current monitoring
sensors must be fitted and the feeds to the signs split so that not more than seven
signs are monitored through one sensor. (Note that at present the controller cannot
monitor LED regulatory signs.)
The red wire from the sensors should be connected to the 'Sens' inputs at the rear
of the first Lamp Switch card (see Figure 16), Sens33 is the first monitoring
channel, Sens34 is the second etc. If more than 28 signs are present, additional
sensors may be added to the second Lamp Switch card (if fitted).
The white wires should be joined together and connected to the 'COMMON' input
(pin b16 of the connector).
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Copyright © Siemens Mobility Limited 2018. All Rights Reserved.
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Neil Atkinson
ST950 ICM Handbook
Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page 25 of 125
Status Issued
Date 18-Dec-2018
Document No. 667/HE/46950/000