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ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 18 of 176
667/HE/53000/000
Issue 2
Unrestricted
The RAG Node is provided with a cover to give some mechanical protection and has several status
LEDs. which indicate the operational status of the Node. The RAG Node PCB is conformally coated
to provide additional protection and improve reliability.
A Bypass Module is included which plugs into the RAG Node. The Bypass Module allows for the
continuation of the Plus
+
communications and operation even if a RAG node has been
disconnected (PL4)
for example in the case of a ‘
hot
’
swap. The Bypass Module also provides
addressing functions in order to assist the controller in the management of Nodes.
Controller Monitoring
The controller monitors the status of all nodes and if any phase loses all signals (equivalent to
the failure of an aspect drive in a conventional controller), the controller will register a
compliance failure and extinguish all signals on controller, or the affected stream if configured.
Impact of Bypass Removal
The bypass module must
NOT
be removed and/or swapped from a RAG assembly without
consulting the Technical Support team in the first instance.
The RAG Node provides:
•
Drive and monitoring circuits for up to 4 Plus
+
LED signals (Red, Amber, Green and a
separate green arrow),
•
Drive and monitoring circuits for up to 2 Plus
+
Regulatory Signs,
•
An above ground detector power supply providing 24V DV (@0.5A),
•
Four TOPAS 2523 compliant digital inputs with an additional one which is configured to
be used as a solar cell input.
Two TOPAS 2523 compliant digital outputs which may be used for linking or other similar
functions.
Reference section 4.2 for more details.
48V is Not Lamp Supply
The 48V supplies to the Nodes may remain on even if fault conditions require the Signals to be
switched OFF. The 48V supply that is distributed through the network is not considered a 'Lamp
Supply' and this is a fundamental difference between Plus+ and 'conventional' traffic controllers.
The Nodes guarantee the signals are off as requested, even though there is 48V to the Nodes.