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

Contents

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In case of loss of auxiliary power when the trip lockout function is in use, thecontacts of PO3 return to the same state as before the loss, provided that the batteryhas been inserted and is charged. If no battery has been inserted, the trip lockoutfunction is activated and the contacts of PO3 remain open when the auxiliary poweris switched on again.5.1.7. Trip counters for circuit-breaker condition monitoringThe trip counters for circuit-breaker condition monitoring provide history data,which can be used for circuit-breaker service scheduling. With this information, theservice cycle can be estimated for the future.The monitoring function consists of four counters, which count the number of tripsignals generated to the circuit breaker by the relay. Every time a stage generates atrip signal, the corresponding counter value is increased by one. The number of tripsis stored in the non-volatile EEPROM memory.There are separate counters for the different protection stages. The overvoltagestages (U>, U>> and U2 >), undervoltage stages (U<, U<< and U 1<) and residualovervoltage stages (U0> and U 0>>) have a common trip counter each, whereas thereis an own trip counter for the external trip.The counters can be read via the HMI or SPA parameters V9...V12 and cleared viaSPA parameter V166. When a counter reaches its maximum value, it rolls over.In case several stages trip during the same fault sequence, only thecounter of the stage which tripped first is increased by one.5.1.8. Indicator LEDs and operation indication messagesThe operation of the relay can be monitored via the HMI by means of LEDindications and text messages on the LCD. On the front panel of the relay there arethree indicator LEDs with fixed functionality:* Green indicator LED (ready)* Yellow indicator LED ( start/alarm)* Red indicator LED (trip)In addition, there are eight programmable LEDs and an indicator LED for frontcommunication. Refer to the Operator’s Manual for a more thorough presentation.The indication messages on the LCD have a certain priority order. If different typesof indications are activated simultaneously, the message with the highest priorityappears on the LCD.50REU 610 Voltage RelayTechnical Reference Manual1MRS755769