Section 3 OverviewAbout this chapterThis chapter presents a general overview of the Operator's manual.3.1 Operator overviewThe Human machine interface (HMI) on the IED provides an ideal mechanism for theday to day operation and even advanced use of the IED. The keypad, LCD and LEDson the front of the IED are what constitute the HMI. Troubleshooting, apparatuscontrol, monitoring, setting and configuring are all possible via this interface. Throughthe screens and menu elements available, as well as the keypad, the user is able tonavigate throughout the menu structure and move from screen to screen. Thisdocument is, to a great extent, arranged in the same way as the IED software isstructured and describes all aspects of operation via the HMI.The operator can document disturbances so that their causes can be analyzed andevaluated for future reference. For example, the fault currents and voltages at the timeof the fault can be documented. The operator can also retrieve data about protectedobjects, providing further information for fault analysis. This implies viewing the meanvalue of current, voltage, power and frequency or primary and secondary measuredphasors. The operator can check the IED status at any time.In some cases the operator may need to change the way the IED operates. This mightinclude changing the active setting group or a parameter value. This must always bedone strictly according to applicable regulations because un-authorized changes maylead to severe damage of the protected object especially if a fault is not properlydisconnected.3.2 Identify the IEDTo identify the IED, open the diagnostics menu. The identity of the IED along withother data is found under:Main menu/Diagnostics/IED status/Product Identifiers1MRK506276-UUS B Section 3Overview17Operator's manual
