
T400 Controller Facilities Manual
667/EB/20200/000 Page 19-3 Issue 9
19.1 LAMP MONITOR + OTU (NOT RED LAMP MONITORING)
With the standard lamp monitoring, 5 outputs can be used from the LMU which are
activated as follows:
Fault Output 0 - Red lamp failure on any 3 aspect vehicle phase
Fault Output 1 - Activated if a second red lamp fails on any 3 aspect vehicle
phase where a red lamp has previously failed
Fault Output 2 - Any one lamp (red, amber, green, regulatory sign or wait
indicator) on an input being monitored fails
Fault Output 3 - Active if a second red lamp failure is pending on any 3
aspect vehicle phase where a red lamp has already failed
Fault Output 4 - Activated if a green lamp on any 3 aspect vehicle phase has
failed
Fault Outputs
Set During
Lamps Off
-
Fault Output 2
Fault Output 3
Fault Output 4
These LMU outputs connected directly to OTU to give required reply bits when LMU
outputs are activated.
These outputs have no effect on controller operation.
0
4
3
2
1
L.M.U. O.T.U.
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