ABB REU 610 Technical Reference Manual

Also see for REU 610: Installation manual Technical reference manual Operator's manual Technical reference manual Operator's manual

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ABB REU 610 Technical Reference Manual Manual pdf 19 page image

195.1.1.6. Non-volatile memoryThe relay can be configured to store various data in a non-volatile memory, whichretains its data also in case of loss of auxiliary voltage (provided that the battery hasbeen inserted and is charged). Operation indication messages and LEDs, disturbancerecorder data, event codes and recorded data can all be configured to be stored in thenon-volatile memory whereas setting values and trip counters are always stored inthe EEPROM. The EEPROM does not require battery backup.5.1.1.7. Self-supervisionThe self-supervision system of the relay manages run-time fault situations andinforms the user about an existing fault. There are two types of fault indications;internal relay fault ( IRF) indications and warnings. Internal relay faults preventrelay operation. Warnings are less severe faults and continued relay operation withfull or reduced functionality is allowed.Internal relay fault (IRF)When the self-supervision system detects a permanent internal relay fault, the greenindicator LED starts to flash. At the same time, the IRF contact (also referred to asthe IRF relay), which is normally picked up, drops off. The text INTERNAL FAULTand a fault code appear on the display.# -9 - -&9=A040278Fig. 5.1.1.7.-1 Permanent IRFWarningIn case of a less severe fault (warning), the relay continues to operate except forthose protection functions possibly affected by the fault. At this type of fault, thegreen indicator LED remains lit as during normal operation, but the text WARNINGwith a fault code or a text message indicating the fault type appears on the LCD. Incase of a warning due to an external fault in the trip circuit detected by the trip-circuit supervision, SO2 is activated (if SGF1/8=1).Voltage RelayTechnical Reference ManualREU 6101MRS755769