Section 4 1MRK 500 124-UEN
Local HMI
80 Operation Manual
Distributed busbar protection REB500
The following alarms can be displayed:
• Busbar protection blocked
• Breaker failure protection blocked
• End fault protection blocked
• OCDT blocked Overcurrent protection blocked
• Pole discrepancy protection blocked
• Bay unit alarm
• Contacts blocked
• Inspection/Maintenance
• Inspection alarm
• Auxiliary voltage failed
• Trip transferred
• Circuit breaker alarm
• Isolator alarm
• Test generator active
• Contacts blocked
• HW configuration mismatch
• Pow.sup. fault
• Power supply 2 failed
• AC Fail
• Major error
• BU problem
• CU problem
• General alarm
Viewing the event list and disturbance records is recommended
should an alarm occur. The corresponding procedure is described in
3.5.7. “Disturbance recorder” respectively 3.5.8. “Event list”.
Avoid performing switching operations in the event of the
following alarms before the failure has been analyzed by
correspondingly trained personnel:
• Isolator alarm
• Switch inhibit
• Differential current alarm
• Inspection and maintenance
Non-observance of this precaution can cause mal-operation in
normal operation or a failure to trip in response to a fault.
Isolator alarm may only be acknowledged by appropriately
trained and authorized personnel. Non-observance of this precaution
can cause mal-operation in normal operation or a failure to trip in
response to a fault.
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