UTY 618
5
RESTRICTED
November 1995
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Section 101: Powering Down the UPS
IMPORTANT
Before beginning, measure the voltage of each replacement battery. Each battery should
measure at least 12 V.
101-1.
If there is an external bypass switch, you may use it to bypass the UPS. Otherwise,
shut down the load equipment.
101-2.
Open the front door of the UPS. Turn the key switch to “OFF.”
101-3.
Disconnect AC input power to the UPS.
NOTE: Turning the key switch to “OFF” is not sufficient.
101-4.
If you have one or more external battery cabinets, shut off the DC disconnect
switches on all of the cabinets.
101-5.
Skip Section 102. Go to Section 200 on page 8.
Section 102: Using Battery Maintenance Mode
Battery maintenance mode allows a qualified technician to service the batteries without powering
down the loads connected to the
UNITY
/I unit. Battery maintenance mode should be used only
when the unit does not have an external bypass switch and is powering critical loads that cannot
be shut down while servicing the batteries.
IMPORTANT
In battery maintenance mode, the unit does not regulate voltage or provide back up power
in case of a power outage.
Before beginning, measure the voltage of the replacement battery. Each battery should
measure at least 12 V.
