Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 241 of 265
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38.1 Lamp Monitoring Facility
The Lamp Monitor provides a means to check that the signals (the lamps) are all
working and no failures have occurred.
The ST900 Family controller firmware includes the lamp monitoring facility, which
can be enabled by the configuration, and the standard ST900 controller hardware
includes all the sensors necessary to monitor all the lamps driven by the controller
as standard.
38.1.1 Lamp Monitor Fault Reports
38.1.1.1 Dim / Bright Changes
The lamp monitor monitors the lamp supply and thus confirms each dim/bright
changeover (see section 29.8).
Two faults can be confirmed by the lamp monitor, one for ‘no changes’ and the other
for ‘too many changes’ confirmed in 24 hours. While either fault is logged, the
signals are forced to the bright state. These are ‘historic’ faults and thus can be
cleared at any time by RFL=1.
38.1.1.2 LMU Reset
Whenever the lamp monitor is reset (and thus asked to clear any outstanding lamp
faults and relearn all the lamp loads), an event is entered into the historic rolling log.
38.1.1.3 Lamp Faults
There is one FLF fault flag associated with lamp failures, which will be set when
there is any confirmed lamp fault. The fault log data (accessed using the KLD
handset command) identifies the phase and colour of the lamp fault. As soon as all
lamp replacements are confirmed, this fault will be cleared and the system error LED
on the processor card will be extinguished (assuming no other faults are active)
without needing RFL=1.
If the associated RLM fault is configured as non-latching (see section 38.2.3.3), the
RLM fault will also be cleared automatically when the lamp replacement is confirmed
without needing RFL=1.