Maintenance Mode; Output Test; Self Monitoring; Internal Relay Failure (Irf) - Siemens 7SR45 Argus User Manual

3.16 Maintenance Mode

3.16.1

Output Test

The output test allows the user to operate the output relays.
Any functions assigned in binary output matrix (except protection healthy) will appear in the output test.
The output tests will operate only for the binary outputs which are assigned to that function.

3.17 Self Monitoring

The relay incorporates a number of self-monitoring features.
Supervision includes monitoring of power supply signals, code execution watchdog, memory checks by
checksum, RTC check and battery health checks. The 'Protection Healthy' LED is illuminated when the internal
power supply signals are healthy.
Self monitoring is performed when the relay boots and runs periodically.

3.17.1 Internal Relay Failure (IRF)

The internal relay failure feature monitors the healthiness of the relay and supervises the following scenarios in
the presence of CT power and IRF event will be generated.
1. Unexpected (Watch Dog) Error
In case of an unexpected behaviour of 7SR45 Relay, IRF condition will be signalled and the relay restarts.
If this error is observed frequently, the relay should be sent to the factory.
2. Internal Supply Voltage Error
The relay monitors the internal supply voltage and in case of an error, IRF condition will be signalled.
The protection functions are blocked during this condition.
3. Card Error
In case of I/O card failure, the error message is displayed and IRF condition will be signalled.
The relay performance is not guaranteed and it should be sent to the factory.
4. MLFB Error
If the device information data is not correct during the start up, the error message will be displayed and IRF
condition will be signalled.
In case of MLFB error the relay will not be functional and the relay should be sent to the factory.
5. Calibration Error
The relay checks for the integrity of the calibration data during the start up and displays a message in case of
an error and IRF condition will be signalled.
The user can acknowledge the error message via HMI only and the default calibration data will be applied to
the relay and IRF condition will be cleared.
The relay will be functional only when the calibration error message is acknowledged. In this case, the relay
performance is not guaranteed and it should be sent to the factory for calibration.
6. Setting Error
The relay checks for the integrity of the settings during the start up and displays a message in case of an
error and IRF condition will be signalled.
The user can acknowledge the error message via HMI only and the default settings will be applied to the
relay and IRF condition will be cleared.
The relay will be functional only when the setting error message is acknowledged.
NOTE:
In case of Card Error and MLFB Error, the relay will not be functional and the relay should be sent
to the factory.
The following table displays the error messages and the error codes in the Instrument Mode.
© 2017 Siemens Protection Devices Limited
7SR45 Description of Operation
Chapter 1 Page 32 of 34