Siemens ST950 Plus+ User Manual page 138

ST950 Plus+ User Manual
removed by the Controller Switch in the main cabinet. Also note that the maintenance socket is
still powered when the controller switch is off, as is any equipment powered from Aux MCBs.
9.3.4 Main CPU Card LEDs
When the controller is initially powered up, it performs various internal checks before starting
normal operation. While these checks are being performed, the green heartbeat LED flickers and
the red system error LED remains illuminated on the CPU Card.
If these tests fail, it would point to a serious fault on the CPU Card and it should be replaced. The
error message is repeatedly written to the handset display at 1200 baud, and no other handset
operations can take place. See the ST950 Family Handset Handbook for full details.
If the SE (System Error) light is on, then the processor will have shut the system down and logged
a fault – check the fault log.
9.3.5 CIC Card LEDs
Refer to section 3.16.14 for information.
Each CIC card is equipped with 6 LEDs indicating the state of each CPU.
If a major fault is indicated (fault LED illuminated), check that the GSPI comms cable is correctly
fitted and the card address is set correctly. Additionally, check that the data communications to
the on-street equipment is functional (data comms or authentication issues) – ideally confirmed
by reviewing the controller Fault Log.
If the issue persists after removing any reported faults then consider replacing the CIC PCB.
If all the comms LEDs on the card are out, then check that the GSPI and/or the SPB comms cables
are correctly fitted.
If all lights are off, then suspect the +24V DC supply from the PSU has failed.
Check the +24V DC output from the PSU. If it is not present, remove the power plug into the CPU
Card and re-test – if it is then present, then suspect a short-circuit between the PSU and the
CTB/CIC .
Remove the high-speed serial cables in the controller to isolate the short-circuit.
If there is no +24V DC available at the PSU, then check the AC mains input to the PSU. If present,
replace the PSU and re-test.
If the lights are out on only one CIC then the power supply on that card may have failed – replace
the CIC then re-test. If the issue persists then CTB may require replacing.
9.3.6 I/O card LEDs
If a major fault is indicated, check that the GSPI comms cable is correctly fitted and the card
address is set correctly. If this does not solve the problem, replace the card.
If all of the LEDs on the card are out, then check that the GSPI comms cable is correctly fitted.
Also check other I/O cards in the system and the Intelligent Detector Backplanes.
If all lights are off to all IDBs and I/O cards, then suspect the +24V DC supply from the PSU has
failed.
ST950 Plus+ User Manual Page 138 of 176
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