41MRS 755539Feeder Protection RelayOperator’s Manual - ANSI VersionREF 6103.3.1. Target LEDs ..................................................................... 293.3.1.1. Green target LED ................................................ 293.3.1.2. Yellow target LED ............................................... 293.3.1.3. Red target LED ................................................... 303.3.1.4. Programmable target LEDs ................................ 303.3.2. Target messages .............................................................. 303.3.3. Operation target messages .............................................. 313.3.3.1. Disturbance recorder target ................................ 323.3.3.2. Targets for internal relay faults (IRFs)and warnings ...................................................... 323.4. Detachable plug-in unit ................................................................ 353.4.1. Identifying the product ...................................................... 353.4.2. Detaching and installing the plug-in unit ........................... 363.4.3. Inserting and changing the battery ................................... 374. Commissioning and maintenance ......................................... 394.1. Commissioning instructions ......................................................... 394.2. Maintenance instructions ............................................................. 404.2.1. Relay verification .............................................................. 404.2.2. Preventive parts replacement ........................................... 414.3. Measurements verification ........................................................... 414.4. Function test ................................................................................ 414.5. Digital input test ........................................................................... 424.6. Arc detection test ......................................................................... 424.7. Testing of protection functions ..................................................... 434.7.1. Testing of the short-circuit protection ................................ 434.7.2. Testing of the ground-fault protection ............................... 445. Spare parts ............................................................................... 455.1. Plug-in unit ................................................................................... 455.2. Battery ......................................................................................... 456. Repair ....................................................................................... 467. Ordering information .............................................................. 478. References ............................................................................... 489. Abbreviations ........................................................................... 49