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-ETHOD OF OPERATION
6%
6
# ' #
-ONITORING FUNCTIONS
.UMERICAL PARALLELING DEVICE 6% INCORPORATES
COMPREHENSIVE MONITORING FUNCTIONS WHICH COVER
BOTH HARDWARE AND SOFTWARE
(ARDWARE MONITORING
4HE UNIT IS SUPERVISED FROM THE MEASUREMENT INPUTS
TO THE COMMAND RELAYS $ETAILS ARE AS FOLLOWS
-EASURED QUANTITIES
4HE MEASURED VOLTAGES WHICH ARE RELEVANT FOR
PARALLELING ARE TWICE FED TO THE DEVICE WITH RE
VERSED POLARITY 7ITHIN THE DEVICE THEY ARE TRANS
FORMED IN TWO DIFFERENT CHANNELS ARE LED VIA TWO
DIFFERENT SAMPLE AND HOLD ELEMENTS TWO DIFFER
ENT ANALOGDIGITAL CONVERTERS TO TWO DIFFERENT BUFF
ER REGIONS THEY ARE CONTINUOUSLY CHECKED FOR
PLAUSIBILITY AND CONTINUITY $ISCREPANCIES CAUSE
BLOCKING OF THE DEVICE AND AN ALARM )F THE VOLT
AGES ARE SEPARATED RIGHT FROM THE VOLTAGE TRANS
FORMERS THE VOLTAGE CONDUCTORS ARE INCLUDED IN
THIS SUPERVISION
)F TWO PHASE TO PHASE VOLTAGES ARE CONNECTED
THE DEVICE CHECKS THE PHASE ROTATION TOO &AULTS
CAUSE BLOCKING OF THE UNIT AND AN ALARM
!UXILIARY AND REFERENCE VOLTAGES
4HE PROCESSOR MONITORS THE AUXILIARY VOLTAGES FOR
THE MULTIPLEXER AND OFFSET AND REFERENCE VOLTAGES
FOR THE !$# !NALOG$IGITAL #ONVERTER 4HE DE
VICE IS BLOCKED AS SOON AS IMPERMISSIBLE DEVI
ATIONS OCCUR PERMANENT FAULTS ARE ANNUNCIATED
&AILURE OR SWITCH OFF THE AUXILIARY VOLTAGE AUTO
MATICALLY PUTS THE SYSTEM OUT OF OPERATION THIS
STATUS IS INDICATED BY A FAIL SAFE CONTACT 4RAN
SIENT DIPS IN SUPPLY VOLTAGE OF LESS THAN MS WILL
NOT DISTURB THE FUNCTION OF THE DEVICE
4RIP CIRCUITS
4HE COMMAND RELAYS ARE CONTROLLED BY TWO COM
MAND CHANNELS AND ONE ADDITIONAL RELEASE CHAN
NEL $ISCONTINUITIES AND SHORT CIRCUITS IN THE RELAY
CONTROL CIRCUITS ARE MONITORED
-EMORY MODULES
! CYCLIC CHECKSUM IS FORMED FOR THE PROGRAM
MEMORY %02/- THE PARAMETER ASSIGNMENT
MEMORY %%02/- AND THE WORKING MEMORY
2!- AND COMPARED WITH THE STORED CHECKSUM
4HE CHECKSUM OF %%02/-S IS CALCULATED DURING
EACH NEW PARAMETER ASSIGNMENT PROCESS
3OFTWARE MONITORING
&OR CONTINUOUS MONITORING OF THE PROGRAM SE
QUENCES A WATCHDOG TIMER IS PROVIDED WHICH WILL RE
SET THE PROCESSOR IN THE EVENT OF PROCESSOR FAILURE OR
IF A PROGRAM FALLS OUT OF STEP &URTHER INTERNAL PLAUSI
BILITY CHECKS ENSURE THAT ANY FAULT IN PROCESSING OF
THE PROGRAMS CAUSED BY INTERFERENCE WILL BE RECOG
NIZED 3UCH FAULTS LEAD TO RESET AND RESTART OF THE PRO
CESSOR
)F SUCH A FAULT IS NOT ELIMINATED BY RESTARTING FURTHER
RESTARTS ARE INITIATED )F THE FAULT IS STILL PRESENT AFTER
THREE RESTART ATTEMPTS THE SYSTEM WILL SWITCH ITSELF OUT
OF SERVICE AND INDICATE THIS CONDITION BY DROP OFF
THE AVAILABILITY RELAY THUS INDICATING EQUIPMENT
FAULT AND SIMULTANEOUSLY THE ,%$ "LOCKED COMES
ON
4HE DUAL CHANNEL PROCESSING OF THE MEASURED VAL
UES ACCORDING TWO DIFFERENT MEASURING METHODS IN
CONJUNCTION WITH AUTONOMOUS FIRMWARE MODULES AS
DESCRIBED IN 3ECTION MEET THE EXTREME SAFETY RE
QUIREMENT 4HE LOGICAL CLOSING COMMAND OF EACH
CHANNEL IS ANNUNCIATED AND LOGGED
Содержание 7VE51
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