Eaton 9395 550/275 UPS (225–550 kVA) Installation and Operation Manual 164201716 Rev 2 www.eaton.com/powerquality 9-1Chapter 9 UPS MaintenanceThe components inside the UPS cabinet are secured to a sturdy metal frame.All repairable parts and assemblies are located for easy removal, with very littledisassembly. This design allows authorized service personnel to perform routinemaintenance and servicing quickly.You must schedule periodic performance checks of your UPS system to keep itrunning properly. Regular routine checks of operation and system parameters enableyour system to function efficiently for many trouble‐free years.9.1 Important Safety InstructionsRemember that your UPS system is designed to supply power EVEN WHENDISCONNECTED FROM THE UTILITY POWER. The UPS module 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.W A R N I N G Servicing and maintenance should be performed by qualified service personnel only. LETHAL VOLTAGE PRESENT. This unit should not be operated with the cabinet doors open or protectivepanels removed. Do not make any assumptions about the electrical state of any cabinet in the UPSsystem.Because 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 you suspect that a battery string needsservice, contact an Eaton service representative.If the string requires service, refer to the battery manufacturer's operating manual forinstructions on battery maintenance or contact an Eaton service representative.Observe these precautions when working on or around batteries: Remove watches, rings, or other metal objects. Use tools with insulated handles. Wear rubber gloves and boots. Do not lay tools or metal parts on top of batteries or battery cabinets. Disconnect the charging source prior to connecting or disconnecting terminals. Determine if the battery is inadvertently grounded. If it is, remove the source of theground. Contact with any part of a grounded battery can result in electrical shock.The likelihood of such shock is reduced if such grounds are removed duringinstallation and maintenance. When replacing batteries, use the same number of sealed, lead‐acid batteries.Figure
