Replacing On-Street Equipment For Maintenance - Siemens ST950 Plus+ User Manual

ST950 Plus+ User Manual

Replacing On-Street Equipment for Maintenance

See Appendix A for details of approved spares.
Node Signals illuminate immediately following user action
As soon as certain user actions are accepted (e.g. 'Acknowledge' in the Fault Log), the Signals on the Node
will illuminate in whatever state is required for the Phase. As field support the user should either:
•
Trigger the action at a suitable point in the traffic sequence, e.g. Phase at Red with the traffic on
that approach already stationary
• It is therefore expected that the Plus+ Signal is bagged when it is fitted to a Pole (whether it is new
or existing) until it is checked. This applies to ALL signal included but not limited to RAG, Near-
Sides and Waits.
Removing Faulty Node when there is no Replacement
If a failed Node cannot be replaced and is going to be left (e.g. no spare available), the Node should be
disconnected (from its Bypass Module) to isolate the 48V supply from those Signals.
9.5.1 Replacement of a RAG Node.
The RAG (Red Amber Green) Node can be hot swapped, in most cases, as part of a maintenance
procedure.
Take note of 'Last Lamp'
When replacing Nodes, the technician should consider the 'Last Lamp'. If the 'Last Lamp' of any phase
will be extinguished due to the replacement of a Node, a compliance error will be registered by the
controller and the site (or stream; depending on configuration) will be extinguished.
The process of removal is as follows;
1. Open the Green Aspect door, on the traffic head that contains the relevant Node.
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