Protection
Alarms
SKF Multilog On
-Line System IMx-M
2 - 21
User Manual
Table 2-2: Trip multiply activation logic for combined measurement.
Trip multiply activation logic for Combined measurement
Ch X
Ch Y
Combined measurement (of Ch
X and Ch Y)
Not activated
Not activated
Not activated
Activated
Not activated
Activated
Not activated
Activated
Activated
Activated
Activated
Activated
Alarm Status Propagation
Whe
n the status of a measurement channels, system status, relay status or other
system critical events occurs the internal status registers are updated and the new
status information is made available on the communication bus of the rack. This way
the status information propagates in the rack and then out of the rack to other systems.
Alarm status, relay activation changes and system status are all reflected on the
internal communication bus and the other modules can respond appropriately to the
status.
The status changes also causes both the PRM and RLM to create Protection Events and
Relay Events which will be communicated to the CMM in which they will be stored (See
Event Log).
Figure 2 - 15.
Propagation of Alarm Status and Events.
PRM: The alarm status information update process
1.
Measurement performed
2.
Measurement value evaluated against configured alarm levels and hysteresis
3.
Alarm status information updated and made available
4.
LED indicators in front panel updated