Ups Maintenance; Important Safety Instructions - Eaton 93PM User And Installation Manual

7 UPS maintenance

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.

7.1 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 bleed-off before
attempting internal access to the UPS module.
CAUTION
• 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.
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 service representative.
If the string requires service, refer to the battery manufacturer's operating manual for instructions on
battery maintenance or contact your 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 the ground.
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 during installation and maintenance.
• When replacing batteries, use the same number of sealed, lead-acid batteries.
• Proper disposal of batteries is required. Refer to your local codes for disposal requirements.
72 30-200 kW
User's and Installation Guide
P-164000249
Revision 2