Siemens 7SD502, Instruction Manual

Page: 48 / 178

-ETHOD OF OPERATION 3$
6
# ' #
3OME INDICATORS AND RELAYS INDICATE CONDITIONS IT IS
NOT APPROPRIATE THAT THESE SHOULD BE STORED %QUALLY
THEY CANNOT BE RESET UNTIL THE ORIGINATING CRITERION
HAS BEEN REMOVED 4HIS MAINLY CONCERNS FAULT INDI
CATIONS SUCH AS AUXILIARY VOLTAGE FAULT ETC
! GREEN ,%$ INDICATES READINESS FOR OPERATION 4HIS
,%$ CANNOT BE RESET AND REMAINS ILLUMINATED WHEN
THE MICROPROCESSOR IS WORKING CORRECTLY AND THE UNIT
IS NOT FAULTY 4HE ,%$ EXTINGUISHES WHEN THE SELF
CHECKING FUNCTION OF THE MICROPROCESSOR DETECTS A
FAULT OR WHEN THE AUXILIARY VOLTAGE IS ABSENT
7ITH THE AUXILIARY VOLTAGE PRESENT BUT WITH A DE
TECTED INTERNAL FAULT IN THE UNIT A RED ,%$ ILLUMINATES
"LOCKED AND BLOCKS THE UNIT
)NFORMATION ON THE DISPLAY PANEL OR TO
A PERSONAL COMPUTER
%VENTS AND CONDITIONS CAN BE READ OFF IN THE DISPLAY
ON THE FRONT PLATE OF THE DEVICE !DDITIONALLY A PER
SONAL COMPUTER FOR EXAMPLE CAN BE CONNECTED VIA
THE OPERATION INTERFACE AND ALL THE INFORMATIONS CAN
THEN BE SENT TO IT
)N THE QUIESCENT STATE IE AS LONG AS NO NETWORK
FAULTS ARE PRESENT THE DISPLAY OUTPUTS SELECTABLE OP
ERATING INFORMATION USUALLY AN OPERATIONAL MEA
SURED VALUE IN EACH OF THE TWO LINES )N THE EVENT OF A
NETWORK FAULT SELECTABLE INFORMATION ON THE FAULT AP
PEARS INSTEAD OF THE OPERATING INFORMATION EG THE
PROTECTION FUNCTION WHICH HAS PICKED UP AND
ELAPSED TIME FROM FAULT DETECTION TO TRIP COMMAND
4HE QUIESCENT INFORMATION IS DISPLAYED AGAIN ONCE
THESE FAULT ANNUNCIATIONS HAVE BEEN ACKNOWL
EDGED 4HE ACKNOWLEDGEMENT IS IDENTICAL TO RESET
TING OF THE STORED ,%$ DISPLAYS AS IN 3ECTION
4HE DEVICE ALSO PROVIDES SEVERAL EVENT BUFFERS EG
FOR OPERATING MESSAGES CIRCUIT BREAKER OPERATION
STATISTICS ETC REFER 3ECTION WHICH ARE SAVED
AGAINST SUPPLY VOLTAGE FAILURE BY A BUFFER BATTERY
4HESE MESSAGES AS WELL AS ALL AVAILABLE OPERATING
VALUES CAN BE TRANSFERRED INTO THE FRONT DISPLAY AT
ANY TIME USING THE KEYBOARD OR TO THE PERSONAL COM
PUTER VIA THE OPERATING INTERFACE
!FTER A FAULT FOR EXAMPLE IMPORTANT INFORMATION CON
CERNING ITS HISTORY SUCH AS PICKUP AND TRIPPING CAN
BE CALLED UP ON THE DISPLAY OF THE DEVICE 4HE FAULT
INCEPTION IS INDICATED WITH THE ABSOLUTE TIME OF THE
OPERATING SYSTEM PROVIDED THIS FEATURE IS AVAILABLE
4HE SEQUENCE OF THE EVENTS IS TAGGED WITH THE RELA
TIVE TIME REFERRED TO THE MOMENT AT WHICH THE FAULT
DETECTOR HAS PICKED UP 4HUS THE ELAPSED TIME UNTIL
TRIPPING IS INITIATED AND UNTIL THE TRIP SIGNAL IS RESET
CAN BE READ OUT 4HE RESOLUTION IS MS
4HE EVENTS CAN ALSO BE READ OUT WITH A PERSONAL
COMPUTER BY MEANS OF THE APPROPRIATE PROGRAM
$)'3) 4HIS PROVIDES THE COMFORT OF A #24 SCREEN
AND MENUGUIDED OPERATION !DDITIONALLY THE DATA
CAN BE DOCUMENTED ON A PRINTER OR STORED ON A
FLOPPY DISC FOR EVALUATION ELSEWHERE
4HE PROTECTION DEVICE STORES THE DATA OF THE LAST FOUR
NETWORK FAULTS IF A FIFTH FAULT OCCURS THE OLDEST FAULT IS
OVERWRITTEN IN THE FAULT MEMORY 4HE LAST THREE NET
WORK FAULTS CAN BE READ OUT IN THE DISPLAY
! NETWORK FAULT BEGINS WITH THE FIRST RECOGNITION OF THE
FAULT BY PICKUP OF ANY FAULT DETECTOR AND ENDS WITH
THE LAST FAULT DETECTOR DROPOFF OF ANY PROTECTION FUNC
TION
)NFORMATION TO A CENTRAL UNIT OPTIONAL
)N ADDITION ALL STORED INFORMATION CAN BE TRANSMITTED
VIA AN OPTICAL FIBRE CONNECTOR TO A CONTROL CENTRE FOR
EXAMPLE THE 3)%-%.3 ,OCALIZED 3UBSTATION !UTO
MATION 3YSTEM ,3! 4RANSMISSION USES A STAN
DARDIZED TRANSMISSION PROTOCOL ACCORDING TO )%#
AND 6$%7:6%) !LTERNATIVELY THE
PROTOCOL IS ACCORDING $). SELECTABLE