Eaton 9390 UPS (100–160 kVA) Installation and Operation Manual 164201604 Rev E www.eaton.com/powerquality 13-1Chapter 13 Maintaining the UPS SystemThe components inside the UPS cabinet are secured to a sturdy metal frame that issupported by the UPS magnetics. This design allows authorized service personnel toremove repairable components with very little disassembly. All repairable parts andassemblies are located in the front of the UPS, allowing all routine maintenance andservicing to be performed with front panel access.Schedule periodic performance checks of your UPS system to keep it runningproperly. Regular routine checks of operation and system parameters will enable yoursystem to function efficiently for many trouble‐free years.13.1 Important Safety InstructionsRemember that your UPS system is designed to supply power EVEN WHENDISCONNECTED FROM THE UTILITY POWER. The UPS cabinet interiors are unsafe untilthe DC power source is disconnected and the electrolytic capacitors are discharged.After disconnecting the utility power and the DC power, authorized service personnelshould wait at least five minutes for capacitor bleedoff before attempting internalaccess to the UPS module.D A N G E RThis UPS contains LETHAL VOLTAGES. All repairs and service should be performed by AUTHORIZEDSERVICE PERSONNEL ONLY. There are NO USER SERVICEABLE PARTS inside the UPS.W A R N I N G Servicing and maintenance should be performed by qualified service personnel only. LETHAL VOLTAGE PRESENT. DO NOT operate with the cabinet doors open or safety shields removed. Donot make any assumptions about the electrical state of any cabinet in the UPS system. See “Safety Warnings” on page 2-1.Since each battery string is an energy source in itself, opening the Battery CircuitBreaker does not de‐energize the voltage within the battery string. DO NOT ATTEMPTTO ACCESS ANY INTERNAL AREA OF THE BATTERY STRING YOURSELF. VOLTAGES AREALWAYS PRESENT IN THE BATTERY STRING.If the string requires service, refer to the battery manufacturer's operating manual forinstructions on battery maintenance, or contact your Eaton service representative.Figure
