
The DSP normal operation supervision verifies:
*
DSP SW watchdog
It is based on a flag-toggle mechanism. The DSP is faulty if it does not toggle a
flag for 1 second.
*
MC-DSP communication
The DSP is faulty if the number of consecutive fault requests reaches a pre-
defined counter (15). Note that, during normal operation, the DSP measurements
are requested every 100ms which means that the worst fault-time detection of a
DSP fault is 1.5 sec.
The following table describes signalling/handling of the DSP faults:
Faults/Errors
Signalling
Level
DSP version
HMI error message "
WRONG DSP VERSION
"
SPA event
“
102E23
”
1
DSP Analogue Inputs
calibration factors
HMI error message "
CALIB. DSP FAULT
"
SPA event
“
102E22
”
1
DSP configuration
HMI error message "
CONFIG. DSP ERROR
"
SPA event
“
102E21
”
1
DSP watchdog
DSP communication
HMI event "
Reset!! DSP fail
"
SPA event
“
0E38
”
2
COM module (optional extension)
The COM module is an optional module that can be installed in the REF 542plus
housing. Its supervision is done only if the COM module is detected at start-up or
configured by REF542CONF. The supervision verifies correct COM module
configuration start-up and correct COM working status during normal operation.
The COM start-up supervision verifies:
*
COM module version
*
COM configuration data version
*
COM module type
The COM start-up supervision verifies that the configured COM module type
matches with the one detected.
The following fault situations can happen:
*
The COM module type detected is different from the one configured in
REF542CONF
*
The COM module has been configured in REF542CONF but it is not
installed in the REF 542plus housing
*
The COM module has been configured in REF542CONF but it has not been
detected due to an internal COM module fault (the detection timeout is 30
sec.)
*
The COM module has been detected but it has not been configured
122
REF 542plus
REF 542plus
Multifunction Protection and Switchgear Control Unit
Operator's manual
1MRS755869
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