ST950S Plus+ Installation and Commissioning Manual
Figure 96. Acknowledge Replacement RAG
Note:
If the complete signal head is being replaced, disconnect the dropper cable from the pole
top board and pull through before removing the complete signal head assembly. The new
signal head can be installed in its place. The controller will recognise the Bypass having been
changed and will require an ‘Acknowledge’.
Important:
When replacing a signal head, the orientation and location must be confirmed, by using the
Lamp Test facility for example.
10.5.2. Replacement of Wait/PDU Board
The Wait/PDU board is used in three variations of Node, namely Wait Indicator, PDU (Pedestrian
Demand Unit) and as part of the Nearside combined. In most cases, the Wait/PDU board can be hot
swapped as part of a maintenance procedure.
The process of removal and replacement is similar in all three cases.
1. Remove power and communications by disconnecting the ByPass connector. In the case of a
Combined Nearside there are two ByPass connections, one of which will be to the Nearside
Indicator Board. In this case both connections will need to be un-made.
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