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15.2 Protective Functions
(1) Overload Protection
If the UPS output is overloaded by exceeding the current capacity of the inverter, such as
when a computer system boots up, the output selector switch automatically switches the
source of AC power from the inverter to the bypass circuit, without interruption. After a
certain period of time has elapsed, the source of power to the load is switched back to the
inverter without interruption (auto-return), as shown in §15.1(1).
Note: When item
⑩
“Overload recovery operation” in §10.1 “Setup Menu Item List” is set
to “Bypass”, the UPS switches to inverter power supply without interruption when
the overload is resolved.
Power supply route on failure of utility power Indications by LEDs
(2) Inverter Fault Protection
If a fault occurs in the inverter, the output selector switch activates automatically and
switches from inverter power to bypass power without interruption. The red ALARM
indicator lights, and the alarm buzzer sounds. The power supply route is the same as for
an overload. Press
to stop the buzzer.
LED indications when an inverter fault occurs
Note: What to do if an inverter fault occurs
Output from the UPS will stop if a power outage occurs during bypass operation due
to an inverter fault. Contact your supplier or a Sanyo Denki representative as soon
as possible.
Utility
power
Output
Converter
Inverte
r
Charger
Batteries
Rectifier