Siemens ST950 Handbook page 3

If you are not certain that the entire system is ELV, you must switch off
the Mains Supply to the controller and lock the Master Switch in the 'off'
position.
If the controller uses an Expansion Cabinet, and in the exceptional
circumstances that the expansion cabinet also needs a mains supply (to
be avoided wherever possible), then the supply to the expansion cabinet
must also be switched off and the master switch in the expansion cabinet
locked in the off position.
To ensure and guarantee isolation the double pole master switch should be opened.
When re-commissioning signals, the following sequence is recommended to ensure
that the correct signal startup sequence is followed:
Switch OFF the controller at the main switch
Switch ON the lamps at the Manual Panel on/off switch
Switch ON the controller at the main switch
More specific safety information is given in the text of the handbook, where it relates to
particular activities or situations.
For Hardware Fail Flash (HFF) Controllers Only (non UK only):
If the controller needs to be changed to HFF after being installed (non UK only) the
following procedure must be followed:
Ensure that the power to the controller is switched off
Move the "Flash" switch (S3) on the CPU Card to its non-HFF position
Run the Controller Self-Test and confirm that it indicates that the controller
hardware is set up for HFF. Note that the signals will not flash when the controller
is powered because the switch on the CPU Card is in the non-HFF position
Switch off the power to the controller
Move the switch on the CPU Card to its HFF position
Switch on the power to the controller and ensure that the correct traffic signals
flash as the controller starts
There are various RJ45 connectors used to connect to peripheral card
within the ST950 family of controllers. Most are not Ethernet ports and
should not be connected to other equipment, including PCs.
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
Sopers Lane, Poole, Dorset, BH17 7ER
Page 3 of 107
Status Issued
Date 16-Jul-2015
Document No. 667/HB/46000/000
Mobility is a division of Siemens Plc