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WARNING
The UPS should only be entered after all breakers on the unit and breakers on all external battery
cabinets connected to the unit have been turned off. For maximum safety, the AC source feeding the
UPS should also be turned off.
If the load connected to the UPS must remain powered while maintenance is performed, the UPS
may be entered while the AC source feeding the UPS remains energized and the Bypass Switch is in
the ON BYPASS position. Under such circumstances, all breakers on the UPS should still be turned
off, but the AC source feeding the UPS will remain on. The upper part of the cabinet, specifically the
Transfer Switch, the INPUT VOLTAGE and OUTPUT VOLTAGE terminal blocks, the upper terminals
of the AC breaker, the small relay located to the right of the AC breaker, and all wiring
interconnecting these components, remains energized with hazardous voltage. Contact with this
hazardous voltage will result in an electrical shock that could result in death or injury; therefore, this
area must be avoided.
Instructions for Opening and Closing the UPS:
The only internal components that are intended to be
serviced by the end-user are the batteries. The end-user should contact the distributor or manufacturer
for repairs needed to any other components within the UPS. Even though the batteries may be serviced
by the end-user, he/she is encouraged to contact the distributor or manufacturer prior to attempting
replacement of batteries. Before opening the unit, make sure you read and understand all of the
warnings in this section. Either turn the Transfer Switch clockwise to the ON BYPASS position (if the
load is to remain energized) or counter-clockwise to the OFF position. Turn off all breakers on the UPS
and all external battery cabinets connected to the UPS. If, and only if, Transfer Switch was moved to
the OFF position, turn off AC feeder breaker to the UPS, for additional safety. After all front panel LEDs
go off, unlock the front panel. Push each latch in and turn 1/4 turn to open the front door.
DO NOT
try to
enter the unit any other way (such as from the side or back panels of the unit) as such an action may
result in risk of
Electric Shock.
After completing servicing inside the unit, close the door, and lock unit
by turning latches and keys 1/4 turn back to their original position. Remove keys from lock and put
away in a safe place. Turn on breakers that were turned off prior to opening the unit. If Transfer Switch
is in the ON BYPASS position, turn it counter-clockwise to the ON UPS position. If Transfer Switch is in
the OFF position, turn it clockwise two positions to the ON UPS position.
8.3 REMOVING AND REPLACING BATTERIES
UPS Batteries:
The batteries are the only component within the UPS that should ever need service.
Batteries have a finite life of approximately 3 to 5 years. Since your UPS has a design life in excess of
20 years, your batteries will probably need to be replaced several times during the life of your system.
Your unit is equipped with either 18 or 20 sealed lead-acid maintenance-free batteries, each having a
nominal voltage of 12 volts and a capacity of either 38 or 65 amp-hours. These batteries are wired in
series to form a battery bank that has a total nominal voltage of 216 volts (18 batteries) or 240 volts (20
batteries). The part number of your UPS determines the battery configuration for your system. The part
number has the format UPSnnnnn/3-xx-y, where nnnnn is the volt-ampere/watt rating of your system
(10000, 15000, 20000, 25000, or 30000), xx is the number of batteries wired in series (18 or 20), and y
is the cabinet size (1 or 2). Size 1 cabinets have 6 trays of batteries with 3 batteries per tray. Size 1
cabinets with 20 batteries have an additional tray of 2 batteries. Refer to figure 11A for a diagram
indicating the wiring of a size 1 cabinet with 20 batteries. Size 2 cabinets have 9 (18 battery systems)
or 10 (20 battery systems) trays of 2 batteries each. Refer to figure 11B for a diagram indicating the
wiring of a size 2 cabinet with 20 batteries.