ABB REJ 525 Operator's Manual

ABB REJ 525 Operator's Manual Manual pdf 21 page image

1MRS 752137-MUM Combined Overcurrent and Earth-Fault RelayOperator’s ManualREJ 525213.3. Protection relay indicationsThe operation of the relay can be monitored by means of two different kinds ofindications on the HMI:• LED indications: Start, Trip and Ready• A text message on the LCD.The basic protection functions are not affected by fault indications.3.3.1. Indicator LEDsWhen a protection stage starts, the yellow indicator LED will be lit. When aprotection stage trips, the yellow indicator LED will remain lit and the red indicatorLED will be lit. When a starting protection stage is blocked, the yellow indicatorLED will start to blink.3.3.1.1. Green indicator LED)LJ *UHHQLQGLFDWRU/('Two different functions are embedded in the READY indicator LED: power on andIRF (internal relay fault).• Indicator off:The auxiliary voltage is not connected.• Lit indicator:The relay is in normal operation, i.e. the CPU operates. No internal faults haveoccurred.• Blinking indicator:An internal relay fault has occurred. Refer to section Internal fault.3.3.1.2. Yellow indicator LED)LJ START indicator• Indicator off:No protection stage has started.GreenSTARTREADY TRIPYellowSTARTREADY TRIP