Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 249 of 265
Phases Inhibited or Blacked-Out
A
B C X Y Z A2 B2 F2
Phases With a 2nd Red
Lamp Fault Confirmed
A 1 1 1
B 1 1 1
C 1 1 1
X 1 1
Y 1
Z
A2 1
B2
F2
Figure 43 – Second Red Lamp Failure (Example 1)
Phases A, B and C belong to a part-time stream and therefore any failures on these
phases cause all three phases to be blacked-out so that the whole stream is
extinguished.
Phases X to B2 belong to a stream where pedestrian RLM is required. In this case,
red lamp failures on the vehicle phases (X, Y, A2) inhibit the appearance of the
conflicting pedestrian phases (Z, B2).
For Non-UK Controllers, rather than extinguishing the stream, ‘second red lamp
failures’ can be configured to cause the stream to immediately enter its part-time
state, which can be configured as vehicle flashing ambers for example.
If this is required, the ‘fail to part-time state’ facility should be enabled (see section
14.4) and the above table should be left blank. The controller then sends the stream
immediately to its part-time state (e.g. vehicle flashing ambers) regardless of
minimum green times, inter-green times, stage restrictions or the configured switch
off stage.
Note that this facility can be used even if the stream(s) are not required to switch off
a certain times of day, i.e. even if the part-time facility itself is not required for any
other reason.
38.2.3.2 Consideration for Multiple Part-Time Streams
When one stream is extinguished due to a second red lamp fault, it may be required
that other streams are also extinguished so that some streams are not left running
while one is extinguished.
In this case, the controller can be configured to extinguish all of the phases on the
other streams as well as the all of the phases in the same stream as the phase with
the red lamp fault. If in previous example, phases X to B2 had also been a part-time