Modes of Operation

7.3Battery Mode

The UPS switches to Battery mode in the event of an extreme input voltage/frequency condition or complete mains failure. The battery system supplies power through the Inverter (1000VA & 1440VA) or through the DC-to-DC converter to the Bi-Directional Converter (2200VA & 3000VA) to generate power for the connected equipment.

When the UPS is in Battery mode, the Battery Indicator illuminates green and an alarm sounds every 10 seconds. As capacity decreases, fewer indicators remain illuminated. Figure 15 shows the UPS in Battery mode with 61% - 80% battery capacity remaining.

Figure 15 Battery mode at 61 – 80% battery capacity

Battery Indicator illuminated

When a low battery condition occurs, the Battery Indicator flashes green and the alarm sounds every half-second. The default low battery warning is two (2) minutes but can be configured via MultiLink. For more information, refer to 11.0 - Troubleshooting.

Figure 16 Low Battery mode

Battery Indicator flashes green

For approximate battery run times, refer to Table 5 - Battery run times. These run times are approximates based on resistive load and an ambient temperature of 25°C (77°F). To increase this time, turn Off non-essential pieces of equipment, such as idle computers and monitors, or add exter- nal battery cabinets.

! CAUTION

Turning Off the UPS while it is in battery mode will result in loss of output power.

7.4Battery Recharge Operation

Once mains power is restored, the UPS resumes normal operation. At this time, the Battery Charger begins recharging.

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Liebert PSITM Battery Mode, Battery Recharge Operation, Battery Indicator illuminated, Battery Indicator flashes green

PSITM specifications

The Liebert PSITM is an advanced power protection system designed to ensure the reliability and efficiency of critical systems in data centers, industrial applications, and mission-critical environments. As the demand for uninterrupted power supply continues to grow, the Liebert PSI serves as an indispensable asset.

One of the main features of the Liebert PSI is its online double-conversion technology. This method guarantees a continuous supply of clean and stable power to connected loads by converting incoming AC power to DC, then back to AC. This process eliminates power disturbances such as voltage sags, surges, and harmonics, ensuring that sensitive equipment operates without interruption.

In addition to its robust power protection capabilities, the Liebert PSI offers scalable solutions to meet varying power requirements. Ranging from 5 kVA to 40 kVA, it can be configured for single or three-phase operation. This flexibility allows businesses to tailor the system to match their specific needs, whether they are expanding data center operations or simply upgrading existing infrastructure.

Another notable characteristic of the Liebert PSI is its energy efficiency. The unit is designed to operate with a high efficiency of up to 94%, which not only reduces operational costs but also minimizes the environmental impact. Moreover, it features an eco-mode that optimizes energy use during non-critical operations without sacrificing reliability.

The Liebert PSI is equipped with advanced communication and management capabilities. It includes an intuitive LCD display for real-time monitoring, enabling users to access vital information about the unit's performance and status. Additionally, it supports various communication protocols such as SNMP and Modbus, allowing for seamless integration into existing management systems.

Furthermore, the Liebert PSI is designed with an emphasis on modularity, allowing for easy upgrades and maintenance. This modular approach reduces downtime and enhances serviceability, ensuring that the system remains reliable throughout its lifecycle.

In summary, the Liebert PSITM stands out as a comprehensive power protection solution that combines cutting-edge technology, energy efficiency, and user-friendly features. Its commitment to safeguarding critical systems against power disturbances makes it a vital component in the infrastructure of any modern data center or industrial setting.