14-1EATON Powerware® 9390 UPS (100–160 kVA) Installation and Operation Manual S 164201554 Rev E powerware.comChapter 14 Maintaining the UPS SystemThe components inside the UPS cabinet are secured to a sturdy metal frame. All repairableparts and assemblies are located for easy removal, with very little disassembly. This designallows authorized service personnel to perform routine maintenance and servicing quickly.You must schedule periodic performance checks of your UPS system to keep it runningproperly. Regular routine checks of operation and system parameters enable your systemto function efficiently for many trouble-free years.14.1 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. Afterdisconnecting the utility power and the DC power, authorized service personnel shouldwait at least five minutes for capacitor bleedoff before attempting internal access to theUPS 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 openor protective panels removed. Do not make any assumptions about the electrical state ofany cabinet in the UPS system.Since each battery string is an energy source in itself, opening the battery circuit breakerdoes not de-energize the voltage within the battery string. DO NOT ATTEMPT TO ACCESSANY INTERNAL AREA OF THE BATTERY STRING YOURSELF. VOLTAGES ARE ALWAYSPRESENT IN THE BATTERY STRING. If you suspect that a battery string needs service, youshould contact your Eaton service representative.If the string requires service, refer to the battery manufacturer’s operating manual forinstructions on battery maintenance or contact your 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.
