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.

Utility

 

Output

power

 

 

Rectifier

 

Inverter

 

Charger

Converter

 

 

 

 

Batteries

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.

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