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

ABB REU 610 Technical Reference Manual Manual pdf 51 page image

515.1.7. Trip counters for circuit-breaker condition monitoringThe trip counters for circuit-breaker condition monitoring provide historydata, which can be used for circuit-breaker service scheduling. With thisinformation, the service cycle can be estimated for the future.The monitoring function consists of four counters, which count the number oftrip signals generated to the circuit breaker by the relay. Every time anelement generates a trip signal, the corresponding counter value is increasedby one. The number of trips is stored in the non-volatile EEPROM memory.There are separate counters for the different protection elements. Theovervoltage elements (59P-1, 59P-2 and 47), undervoltage elements (27P-1,27P-2 and 27D) and residual overvoltage elements (59N-1 and 59N-2) have acommon trip counter each, whereas there is an own trip counter for theexternal trip.The counters can be read via the HMI or SPA parameters V9...V12 andcleared via SPA parameter V166. When a counter reaches its maximumvalue, it rolls over.In case several elements trip during the same fault sequence,only the counter of the element which tripped first is increasedby one.5.1.8. Target LEDs and operation target messagesThe operation of the relay can be monitored via the HMI by means of LEDtargets and text messages on the LCD. On the front panel of the relay thereare three target LEDs with fixed functionality:* Green target LED (ready)* Yellow target LED (pickup/alarm)* Red target LED (trip)In addition, there are eight programmable LEDs and an target LED for frontcommunication. Refer to the Operator’s Manual for a more thoroughpresentation.The target messages on the LCD have a certain priority order. If differenttypes of targets are activated simultaneously, the message with the highestpriority appears on the LCD.The priority order of the operation target messages:1. CBFAIL2. Trip3. Pickup/Alarm1MRS755972 Voltage RelayTechnical Reference Manual - ANSI VersionREU 610