Liebert PowerSure PS250-50S - Manual (Page 6)

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Option Switch 3 & 4: Low Voltage Limit Select – Low voltage limit is the
voltage level at which battery operation starts. You may set the low voltage limit
of the UPS to 180V, 190V, or 200V. The factory setting is 190V. This option
reduces excessive battery usage in brownout conditions. Make sure your
computer equipment can operate at 180 VAC before selecting the lowest limit
(most will). Refer to the tables below to change switch settings:
BATTERY TEST BUTTON
The Battery Test Button (5) on the 400 and 600 VA models tests the condition of
the battery. If the charge is sufficient, the UPS lights the Battery Light (2), runs
on battery power for 15 seconds, then returns to mains power. If the battery fails
the test, the Check Light (3) illuminates and the UPS immediately returns to
mains power. The Check Light remains lit while on mains power. A battery in
unacceptable condition requires recharge or replacement of the battery.
Pressing the Battery Test Button (5) also silences alarms.
BATTERY CARE AND USE
STORAGE: If the unit is not in continued use, plug in the UPS every 4 to 6
months for 12 hours to recharge the battery. Warranty is void if the battery
discharges below the minimum battery cutoff point. To prevent such discharge,
DO NOT leave UPS ON for more than two days without plugging it in.
BATTERY LIFE & REPLACEMENT: Excessive battery use, storage at high
ambient temperatures, and lengthy periods in a discharged state greatly reduce
battery life. Your UPS maximizes battery life by limiting the depth of battery
discharge. You may replace the UPS battery yourself, but if you feel unqualified,
refer battery replacement to qualified personnel. Contact your local dealer or call
Liebert for a replacement battery.
WARNING: To replace batteries, turn OFF UPS and unplug it from mains supply.
CAUTION: Observe proper precautions. When replacing batteries, use the same
number and type of batteries. Proper battery disposal required. Refer to local
codes for disposal requirements. Do not open or mutilate battery. Released
electrolyte is harmful to skin and eyes and is toxic.
250 VA MODEL
VOLTAGE SWITCH #3 SWITCH #4
200V OFF N/A
190V ON OFF
180V ON ON
400/600 VA MODELS
VOLTAGE SWITCH #3 SWITCH #4
200V ON N/A
190V OFF OFF
180V OFF ON