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2. For Proper Operation
2.1 Input Power Requirements
(1) Make certain that the AC input voltage and frequency correspond to the specified equipment
rating (100V, 110V, 115V, 120V, within -20% and +15%, and 50 or 60 Hz
±
5%: Active Filter
and Economy Mode*).
* The frequency variation range is set to
±
3% when the UPS is shipped from the factory.
If the frequency variation range of input power supply is
±
5%, select
±
5% as described in item
③
“Frequency sync range” of 10.1 “Setup Menu Item List”. Because the frequency sync range is the same
for both input and output, an input frequency error occurs when the frequency sync range exceeds the
setting value, preventing the UPS from switching to active filter mode or economy mode operation.
(2) The current capacity of the AC power supply must satisfy the requirements of the UPS
(0.96 kVA or more). (Breaker capacity of 20 A or more is recommended.)
2.2 Installation Precautions
(1) Carefully consider the leakage current when a leakage circuit breaker is installed on the
input side. The maximum leakage current of the UPS is 3mA.
(2) Keep the UPS at least 1 m (about 40 inches) away from CRT displays. Other devices which
may be sensitive to magnetic flux should be kept away from the UPS, as it emits a slight
amount of magnetic flux.
(3) The UPS employs a fan for forced-air cooling. Provide at least 20 cm (about 8 inches)
clearance at the front and back of the UPS to permit free airflow at the air intake and
exhaust vents. Also, for maintenance purposes, a space of at least 1 m (about 40 inches) will
be needed at the front of the UPS and a space of at least 50 cm (about 20 inches) will be
needed at the back of the UPS.
When mounting the UPS in a rack, use a rack which allows ventilation and provide at least
20 cm (about 8 inches) clearance from the front and back of the rack to permit free airflow at
the air intake and exhaust vents. Also, for maintenance purposes, a space of at least 1 m
(about 40 inches) will be needed at the front of the rack, and a space of at least 50 cm (about
20 inches) will be needed at the back of the rack.
For details, see §6.3 “Installation Space”.
(4) When the AC input power is single-wire grounded, always connect the ground phase to the S
terminal (phase) side on the UPS.
(5) As far as possible, do not ground the output (load) side. If you must make a single-wire
grounded connection, always connect the ground phase to the V terminal (phase) side on the
UPS. (This is to prevent short-circuiting by the ground.)
2.3 Usage Precautions
(1) Never short-circuit the output terminals, or connect a load which draws short-circuit current.
Doing so causes protective functions to activate or fuses to open, preventing output.
(2) Unsuitable load devices
Do not connect laser printers, plain paper fax machines, copy machines, or overhead
projectors as load devices. Such devices typically include heating elements that draw high
current. This may cause an overload that could prevent battery backup operation when an
outage occurs, and could damage the UPS.
(3) Power supply environment
If the UPS is used in an environment subject to long and frequent power outages (more than
once a week), the batteries may not receive sufficient charge, which could result in
foreshortened battery life and premature battery failure.
(4) If the UPS is not operated for a long period, the batteries may require recharging. Operate
the UPS with no load to recharge the batteries as indicated in the following table, according
to the storage temperature. If the batteries in the UPS are left uncharged, their service life
will be greatly foreshortened.
Storage Temperature Charge Interval No-Load Operation
25°C (77°F) Once every 6 months At least 20 hours
30°C (86°F) Once every 4 months At least 20 hours
40°C (104°F) Once every 2 months At least 20 hours