American Power Conversion 450 user manual Operating Modes, Storage

Operating Modes

Shutdown Mode

In shutdown mode the UPS stops supplying power to the load, waiting for the return of utility power. If there is no utility power present, external devices (e.g., servers) connected to the computer interface can command the UPS to shut down. This is normally done to preserve battery capacity after the graceful shutdown of protected servers. The on-line and overload LEDs will blink alternately when the UPS is in shutdown mode.

Self-test

The UPS performs a self-test automatically when turned on, and every two weeks thereafter (by default). Automatic self-test eases maintenance requirements by eliminating the need for periodic manual self-tests.

During the self-test, the UPS briefly operates the loads on-battery. If the UPS passes the self-test, it returns to on-line operation.

If the UPS fails the self-test it immediately returns to on-line operation and lights the replace battery LED.

The loads are not affected by a failed test. Recharge the battery overnight and perform the self-test again. If the replace battery LED is still on, replace the battery using the procedure described in Replacing the Battery Pack, page 8.

Low Battery

When the UPS is operating on-battery and the energy reserve of the battery runs low, the UPS beeps continuously until the UPS shuts down from battery exhaustion or returns to on-line operation.

Cold Start

When the UPS is off and there is no utility power, use the cold start feature to apply power to the loads from the UPS’s battery.

Note: Cold start is not a normal condition.

∙Press and hold the on/off/test button until the UPS emits a constant tone.

∙Release the on/off/test button during the tone to start the UPS.

Storage

Storage Conditions

Store the UPS covered and upright in a cool, dry location, with its battery fully charged. Before storing, charge the UPS for at least four hours.

Extended Storage

At -15 to +30 °C (+5 to +86 °F), charge the UPS’s battery every 6 months.

At +30 to +45 °C (+86 to +113 °F), charge the UPS’s battery every 3 months.

7 990-5022A, Revision 2 6/99