Liebert PSI XR user manual Normal Mode, Buck/Boost Mode, Battery Mode, Battery Recharge Operation

Operational Modes

5.0OPERATIONAL MODES

5.1Normal Mode

When the UPS is in Normal Mode, the Normal Mode Indicator illuminates green.

5.2Buck/Boost Mode

The Automatic Voltage Regulator (AVR) circuitry compensates for fluctuations in utility power, such as voltage surges and sags. When the Liebert PSI XR detects an abnormality, it raises the undervolt- age (boost) or lowers the overvoltage (buck) as needed. The AVR operates automatically and main- tains the output voltage to the connected equipment, without utilizing the batteries.

LED 1 flashes green and LED 9 illuminates steady green when the UPS is in Boost Mode. LED 2 flashes green and LED 9 illuminates steady green when the UPS is in Buck Mode (see 9.0 - Trouble- shooting for details).

5.3Battery Mode

The UPS switches to Battery Mode in the event of an extreme input voltage/frequency condition or utility failure.

When the UPS is in Battery Mode, the Battery Indicator illuminates amber and an alarm sounds at two-second intervals. As capacity decreases, fewer indicators remain illuminated.

When a Low Battery condition occurs, the Battery Indicator flashes amber and an alarm sounds at one-second intervals. Refer to Table 8 for approximate battery run times.

5.4Battery Recharge Operation

Once utility power is restored, the UPS resumes normal operation and the Battery Charger begins recharging the batteries.

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