3 OPERATION
3.1 Modes of Operation
NOTE: In all of the following modes, including Off mode:
The UPS always provides surge protection and input-breaker protection to the 5 battery backed-up
outlets and the 5 surge-only outlets. The UPS does not need to be On to provide this protection.
The surge-only outlets always have the same voltage level as the UPS input voltage, even when the
UPS is Off. The surge-only outlets are not voltage regulated, battery backed-up, or switched by the
UPS.
3.1.1 Off Mode
The UPS input is plugged into a stable, nominal source, but the battery-backed-up outlets are turned off.
The internal batteries are charging.
NOTE: The surge-only outlets will still have power.
3.1.2 On/Normal Mode
The UPS input is plugged into a stable, nominal source, and the battery-backed-up outlets are turned on.
The internal batteries are charging.
3.1.3 On/Automatic Voltage Regulation (AVR) Mode
The UPS input is plugged in, but the voltage source is abnormally low (brown-out). The UPS automatically
corrects the low voltage and allows the battery-backed-up outlets to be on with the normal, expected
voltage. The internal batteries are charging.
NOTE: The surge-only outlets will have the abnormally-low input voltage and equipment plugged into
these outlets may not work.
3.1.4 On/Battery Mode
The UPS input is not plugged in, or the voltage source has become extremely low or high and unusable.
The UPS automatically switches to the internal battery to provide normal, usable voltage to the battery-
backed-up outlets.
NOTE: The surge-only outlets will not have power.
3.1.5 Fault Mode
An error or fault condition has occurred. The battery-backed-up outlets are shut off.
NOTE: The surge-only outlets may still have power if the UPS input is plugged in.
3.1.6 Battery Self-test Mode
The UPS enters a cycle of approximately 10 seconds during which it tests the internal battery. The
battery-backed-up outlets are still temporarily powered by the internal battery. Self-test mode occurs at
the following instances:
•
At start-up turning the UPS On.
•
Automatically every 8 weeks as a self-check.
•
Manually by pressing and holding the power button for 3 seconds when the unit is On.
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| Liebert® PSA5™ Installer/User Guide |
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