Self-Test Handset Output After Lamp Supply On - Siemens ST950 Handbook

Once initialised, the phase bus processor performs more thorough checks on the
Lamp Switch cards and may detect faults. These tests check the data lines and
board select lines using test latches on each card '(Lat)', the address lines to each
card '(Adr)' and the ADC test voltages '(ADC)'. If more than one test fails, 'Bad L/S
Cards' is displayed instead.
Checks the monitor validation signal:
M/V Test....Failed
Mon Val Failed
The monitor validation signal is generated by the Main Processor and travels down
the phase bus cables to each of the Lamp Switch cards, so a failure can be due to a
faulty Main CPU Card or Lamp Switch card. See FLF 2:252 for more details.
Step 1 Complete, Start Step 2:
At this point, the Self-Test has successfully checked-out the logic side of all the
Lamp Switch cards that it has found. It then displays a scrolling diagonal line on the
amber LEDs on these Lamp Switch cards to prove that it can address all the cards
correctly and to show that the first part of the Self-Test is complete.
If no LEDs illuminate on one of the Lamp Switch Cards, switch off the controller and
investigate; the controller has not detected that card.
In the scrolling pattern, on each Lamp Switch Card, either one or two amber LEDs
are illuminated at a time. On "LED Lamp Switch" Cards (see 667/HB/32921/007),
two LEDs are illuminated at the same time in pattern. On all other variants, only one
amber LED is illuminated at a time.
This pattern remains until the operator presses the level 3 button to confirm that the
pattern is scrolling correctly on all the cards fitted and that the Self-Test may switch
on the lamp supply and continue its tests.
11.6

Self-Test Handset Output After Lamp Supply On

Therefore, check that the diagonal scrolling pattern illuminates all the amber LEDs
on all the Lamp Switch cards fitted.
After the level 3 button is pressed or "Y" entered and confirmed, Self-Test switches
ON the lamp supply and will test each LSC output and monitor circuit by switching
each one ON in turn for just two mains cycles (40ms). This may visible on the traffic
signals as a bright flash, particularly with LED Signals.
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It is essential that the correct number of LSC cards have been detected
at this point as, following this, the Self-Test starts applying the lamp
supply to the LSC Cards.
Unrestricted
5
Neil Atkinson
ST950 ICM Handbook
Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Page 111 of 125
Status Issued
Date 18-Dec-2018
Document No. 667/HE/46950/000