40/42V Elv Controller - Siemens ST950 Handbook

4.12

40/42V ELV Controller

The ST950 ELV 40/42V Controller uses the same firmware and hardware modules as
the 48V controller, except for a unique lamp supply transformer to generate the lower
lamp supply voltages required by 40V and 42V signals. To configure the ST950 ELV
controller to operate with these lower supply voltages and 40V signals, select the
'ELV40V46059.8DF' default data file and the appropriate 40V LED signal types in the
IC4 configuration tool.
4.12.1 40/42V Lamp Supply Transformer
The 40/42V lamp supply transformer provides both 40V and 42V Bright and Dim lamp
supply voltages. 40V signals have been characterised for use with the 40/42V
Controller. The Controller is supplied wired for 40V, and has primary connections that
enable connection to the Main supplies shown below:
Nominal Voltage
250V
240V
230V
220V
120V
110V
Table 16 – ST950 ELV 40V Lamp Supply Transformer
* Refer to the ST950ELV Installation and Commissioning Handbook 667/HE/45950/000
for the recommended input tap for a specific mains voltage.
The limited voltage ranges of the 40V signals result in the Mains tolerance being +10/-
13%, as in EN50556 'Road traffic signal systems'.
The nominal secondary voltages are as follows:
42V Bright Lamp supply, 31V Dim Lamp supply
40V Bright Lamp supply, 27V Dim Lamp supply
24V Detector supply
Logic supplies for LSLS cards (one supply per LSLS card)
There is no 48V Regulatory Sign supply.
The transformer has an earthed screen to reject common mode disturbances on the
Mains supply.
Security classification
Version
Last Editor
Document Name
Copyright © Siemens plc 2015. All Rights Reserved.
Minimum Voltage*
218V
209V
201V
192V
105V
96V
Unrestricted
4
Paul Cox
ST950 General Handbook
Mobility Division, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
Maximum Voltage*
275V
264V
253V
242V
132V
121V
Page 62 of 107
Status Issued
Date 16-Jul-2015
Document No. 667/HB/46000/000
Mobility is a division of Siemens Plc