Redundancy Module - Siemens ST950 Plus+ User Manual

ST950 Plus+ User Manual
In order to ensure high reliability, the Plus
so that failure of one 48V PSU will not extinguish the signals, improving the availability of the
Traffic Signals. An additional advantage is that the 48V PSU can, individually, be swapped out
without impacting junction running.
3.6.1 Parts
48V PSU including Main Kit 667/1/53057/000

Redundancy Module

3.7.1 Overview
The redundancy module is designed to be connected to two or three incoming 48V DC power
supplies, combining their power to produce a single 48V DC supply output for connection to a
single CIC/CTB. The module provides PSU redundancy by ensuring that if a PSU fails, the output is
maintained by the other supplies. The Redundancy Module combined with the 48V PSUs are
collectively known as the Power Bank.
The module provides load balancing to ensure that each connected supply provides an equal share
of power to the system, which maximises reliability. The selection as to whether two or three PSUs
are required for each CIC/CTB is managed by the Design Layout Tool. Each CIC/CTB is connected
to its own redundancy module.
LEDs on the redundancy module indicate the state of each of the incoming supplies. The supply
status information is also provided, via analogue signals to the connected CIC/CTB for the purpose
of monitoring and fault detection.
3.7.2 Redundancy Module Connections
ST950 Plus+ User Manual
system includes power supply redundancy, see below,
+
Figure 17 : Redundancy Module Wiring
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667/HE/53000/000
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