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8
the UPS problem chart in the back of this manual.
OPERATION
The UPS loads may be controlled by the UPS power switch. Since the UPS powers up in the
Inverter mode, a functional test is provided every time it is turned on (or the TEST Button is
pushed). The battery charger operates with the power switch on or off.
If a low voltage condition (brownout), power outage or over-voltage occurs, the UPS will switch to
the Inverter mode, and the AC Normal LED will go out. The Backup LED and Alarm will operate
briefly after about 25 seconds, and then every 15 seconds. For long duration power outages, a
Low Battery Warning is provided about two minutes prior to low battery shutdown. The LED and
Alarm will operate every two seconds. At low battery shutdown the UPS will shut off automatically
to protect the internal batteries form excessive discharge. All LED's, alarm and output power will be
turned off. When commercial power returns, the UPS will return to the AC Normal mode; the Fault
LED and Alarm will operate continuously. Press the Test Button to effect an inverter test and
silence the alarm.
During normal AC mode function, the UPS will quietly protect the load from power surges, voltage
spikes and noise interference. Commercial power outages are usually of a short duration; thus
sounding of the alarm is delayed so as not to be a nuisance.
If the low voltage condition above can be corrected by the boost winding in all models except A300
and A425, the Boost LED will light, signifying the Boost mode is operative and the output voltage
has been corrected.
SYSTEM BATTERIES
The internal batteries used in the MINUTEMAN ALLIANCE UPS UNITS are sealed maintenance-
free, lead-acid batteries with electrolyte totally absorbed in the plates and separator material. For
maximum battery like, temperature should be kept as cool as practical indoors, and at proper trickle
charge voltage. Expected battery
life is 3 to 6 years at 85ºF. For optimum performance, batteries
should be replaced after about 3 years. Replacement batteries can be purchased
from Para
Systems or from your local distributor or dealer. If the UPS is to be stored, allow the batteries to
fully charge for 24 hours; then store in a cool, dry location. For extended storage, recharge the
UPS batteries for 24 hours every 4 months.
When the batteries are replaced, provide the used batteries to recycler for proper disposal and
reclamation of the lead.
BATTERY/SYSTEM CHECKOUT
To verify proper system function and battery condition, the user is encouraged to engage the test
switch periodically. Normal indications as specified should be observed. If the system goes
immediately to the low battery warning mode, the batteries should be replaced.