Thomas & Betts 9395 - Manual (Page 70)

UPS 225 - 275 kVA
User’s and Installation Guide
1027212
Revision B
70
8 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.
8.1 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.
WARNING
• 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. •
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