ABB Triguard SC300E Safety Manual

Also see for Triguard SC300E: User manual

Contents

ABB Triguard SC300E Safety Manual Manual pdf 35 page image

Issue 5 - September 2006 Page 35 of 65run through its off-line diagnostics to re-check its health, which is indicated by the front lightssequencing and the green health light being turned on.When this has completed, the front LED’s are extinguished for approximately 3 seconds andthen are illuminated, the processor is now ready to be warm started into the system.The warm start command instructs the two operating processors to allow the warm startingprocessor to read their memory. The warm starting processor first reads the system data andprogramme code which is static and finally, when this is completed, its requests the twooperating processors to halt for approximately 0.5 seconds whilst it reads the varying data. Thisbeing completed all three processors resume full operation.In the event that an error is found in the warm starting processor during this sequence and itfails to warm start, the two operating processors continue on without the third processor.On the successful culmination of the system repair the error clear should now be operated toclear the error history to enable new faults to be readily interpreted.6.2.3.3 Bus Buffer ModuleThe spare bus buffer module should be visually checked against the user documentation. Thefaulty bus buffer module can now be removed and replaced by the spare module. The errorhistory clear should now be operated to allow any new faults that occur to be readily diagnosed.6.2.3.4 Power Supply ModuleThe spare power supply module should be visually checked.The faulty power supply should first be switched off using the front panel switch beforeunscrewing the chassis fixing screws and then removed.The spare module should then be plugged in and powered up. The error history clear shouldnow be operated to allow any new faults that occur to be readily diagnosed.6.2.3.5 History ClearDuring a maintenance repair activity the history error report should first be printed before thefault bits are cleared by use of the error clear facilities within TriBuild. This action is important asby clearing the errors all historical errors are lost and any new errors that occur will be readilydiagnosed. Also clearing the error bits will ensure that if a time constraint timer is configured inthe application, this will be reset, after one complete LFD test cycle, until the next error appears.6.2.4 Sequence of RepairCertain faults, for example Power Supply, Main Processor and Bus Interface Module, will giverise to both alarms associated with the fault as well as additional alarms. For example whenone of the dual power supply modules in a chassis fails additional to the power supply failurealarm, each I/O module within the chassis will be reporting that one of its power supplies hasfailed and indicate a health problem. It is therefore important to repair the SC300E in a logicalorder or sequence.The following order should be followed assuming fault indication for each item is given: -Priority1 Chassis Power Supply Units2 Main Processor Units MPP3 Bus Interface Units MBB4 I/O Modules5 Field ConnectionAfter each repair the history should be cleared and the next item to appear dealt with.