Eaton Powerware 9390-160/100 Installation And Operation Manual page 161

Chapter 14
The components inside the UPS cabinet are secured to a sturdy metal frame. All repairable
parts and assemblies are located for easy removal, with very little disassembly. This design
allows authorized service personnel to perform routine maintenance and servicing quickly.
You must schedule periodic performance checks of your UPS system to keep it running
properly. Regular routine checks of operation and system parameters enable your system
to function efficiently for many trouble-free years.
14.1 Important Safety Instructions
Remember that your UPS system is designed to supply power EVEN WHEN
DISCONNECTED FROM THE UTILITY POWER. The UPS module interiors are unsafe until
the DC power source is disconnected and the electrolytic capacitors are discharged. After
disconnecting the utility power and the DC power, authorized service personnel should
wait at least five minutes for capacitor bleedoff before attempting internal access to the
UPS module.
Since each battery string is an energy source in itself, opening the battery circuit breaker
does not de-energize the voltage within the battery string. DO NOT ATTEMPT TO ACCESS
ANY INTERNAL AREA OF THE BATTERY STRING YOURSELF. VOLTAGES ARE ALWAYS
PRESENT IN THE BATTERY STRING. If you suspect that a battery string needs service, you
should contact your Eaton service representative.
If the string requires service, refer to the battery manufacturer's operating manual for
instructions on battery maintenance or contact your Eaton service representative.
Observe these precautions when working on or around batteries:
EATON Powerware 9390 UPS (100–160 kVA) Installation and Operation Manual S 164201554 Rev E powerware.com
®
Maintaining the UPS System
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 protective panels removed. Do not make any assumptions about the electrical state of
any cabinet in the UPS system.
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.
W A R N I N G
14-1