EMR-5000
IM02602012E
Self Supervision
The
System-OK contact (SC relay, life-contact)
cannot be configured. The system contact is a Form “C” contact that
picks up when the device is free from internal faults. While the device is booting up, the
System OK relay (SC)
remains
dropped-off (unenergized). As soon as the system is properly started (and protection is active), the System Contact
picks up and the
System LED
is activated accordingly.
The devices are continuously monitored and supervised by different methods during normal operation as well as during
the start-up phase.
Results of this supervision may be:
Messages appearing within the event recorder;
Indications within the display or PowerPort-E;
Corrective measures;
Restart of the device; or
Any combination of the above results.
In case of failures that cannot be corrected immediately, 3 restarts within 20 minutes are accepted before the device will
be deactivated. In such a case, the device should be removed for service to ensure continuous correct operation. The
Eaton Customer Service contact information and address can be found at the front of this manual.
In case of any failures, the recorders of the device should be left untouched to ensure an easy diagnosis and proper
repair at the factory. Besides the records and visible indications to the customer, there is internal information about
failures. These allow Eaton service personnel at the repair facility to make a detailed analysis of files with failure
reports.
Self supervision is applied by different functions at different cyclic or non-cyclic timings to the following parts and
functions of the device:
•
Faultless cyclic execution of the software;
•
Functional capability of memory boards;
•
Consistency of data;
•
Functional capability of hardware sub-assemblies; and
•
Faultless operation of the measuring unit.
Faultless cyclic operation of the software is supervised by timing analysis and checking results of different functions.
Errors of the software (watchdog function) lead to restarting the device and switching off the
System-OK contact (life
contact). In addition, the “System-OK” LED will blink red after 3 unsuccessful attempts to restart the device within a
time period of 20 minutes.
The main processor cyclically monitors the operation of the signal processor and initiates corrective actions or restart of
the device in case of faulty operation. Data and files are generally secured against unintended overwriting or faulty
changes by check-sums.
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