Technical data

1MRS751108-MUM
REX 521
21
Protection Relay
Technical Reference Manual, General
A0501900
Fig. 5.1.1.4.-1 Graphical I/O Setting Tool
5.1.1.5. Factory settings
The factory settings for the relay can be restored by selecting “Activate” from HMI
path Configuration\General\Software\Factory settings. After
this, the relay will reset itself immediately and start with the factory-set parameter
values.
When starting again, the relay display shows the text
:WARNING EEPROM -> FLASH
on the display. This means that the calibration parameters have been read from the
MIM card and copied to the non-volatile memory of the CPU card. After ten
seconds, the relay will reset itself again, and takes the correct calibration parameters
into use.
The unnecessary restoring of factory settings should be avoided
because all the parameter settings that are written earlier to the relay
will be lost, that is, overwritten with the default values. During
normal use this can cause a protection function to trip when the
settings are suddenly changed.