SECTION 2 THEORY OF OPERATION

2.1GENERAL DESCRIPTION

The Liebert Series 300 Load Bus Sync (LBS) option works by monitoring the sync reference signals of two UPS modules, each equipped with a specially designed interface. The LBS remains dormant until the outputs of the UPS modules drift more than a predetermined amount out of sync. In the event of an out of sync condition, the LBS becomes active and brings the output of both UPS modules back in sync, and then resumes the dormant state.

2.2LOAD BUS SYNC CONTROLLER

The Series 300 LBS controller fits into a compact 20x24 inch enclosure. The front panel controls are simple and fault tolerant. They enable the operator to do the following:

A.Select whether the controller will function automatically or be “Off.”

B.Select which UPS, (System 1 or System 2) will become the Designated Master System (DMS). The other UPS module will become the Designated Slave System (DSS).

2.3SERIES 300 LBS MODULE INTERFACE

In order for the LBS controller to send and receive signals from the Series 300 modules, each module must have the proper interface installed. The Series 300 interface consists of two main components as follows:

A.The LBS Interface Panel

B.The LBS Adapter PWA

The LBS Interface Panel has many configurations to accommodate the many input and output voltages available on the Series 300 UPS. The LBS Adapter PWA has only one configuration, which is used with all Series 300 LBS installations.

The LBS Interface Panel performs the following functions:

A.Receives and scales sync signals from the LBS Controller.

B.Receives signals from the LBS Controller to determine whether to use internal sync or sync to the other UPS module.

C.Receives static switch disable signals from the LBS Controller.

D.Provides the LBS Controller with bypass voltage signals, output voltage signals and bypass available signals.

E.Provides the LBS Controller with 120 VAC control power.

The LBS Adapter PWA performs the following functions:

A.Receives and shapes sync signals for the LBS Interface Panel and routes the sync signal to the processor board.

B.Selects the sync source, either internal or from the other UPS based on signals that originate with the LBS Controller and passed on through the LBS Interface Panel.

C.Disables the static switch on the slave UPS when the slave UPS is acquiring sync with the master UPS.

Series 300 Load Bus Synchronization

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PRODUCT

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Liebert manual Theory of Operation, General Description, Load BUS Sync Controller, Series 300 LBS Module Interface
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300 specifications

The Liebert 300 is a high-performance precision cooling unit designed specifically for critical environments such as data centers, telecommunications facilities, and server rooms. This system ensures optimal temperature and humidity control, which are crucial for maximizing the performance and longevity of sensitive electronic equipment.

One of the main features of the Liebert 300 is its advanced cooling technology. It employs a direct expansion (DX) cooling system, which provides efficient cooling without the need for extensive ductwork. This design allows for easy installation and retrofitting in existing facilities. In addition, the unit is equipped with variable-speed compressor technology, enabling it to adjust cooling output based on real-time demands. This capability dramatically increases energy efficiency while maintaining the ideal operating conditions for critical equipment.

The Liebert 300 also incorporates intelligent controls and monitoring systems. With embedded microprocessor controls, users can manage and customize settings via a user-friendly display interface. Real-time monitoring of temperature, humidity, and airflow ensures that any fluctuations are promptly addressed. This system is also compatible with building management systems (BMS) to provide comprehensive oversight of all environmental conditions.

In terms of energy efficiency, the Liebert 300 meets or exceeds the latest industry standards, such as ASHRAE and ISO. Its eco-friendly refrigerants help reduce environmental impact, aligning with sustainability goals. Additionally, it features advanced heat recovery options, allowing for the reuse of thermal energy for heating processes or hot water generation.

The design of the Liebert 300 emphasizes not only performance but also reliability. Built with durable materials and robust construction, this unit is engineered to operate continuously under demanding conditions. Regular maintenance is simplified through its modular structure, allowing for easy access to components that may require servicing or replacement.

Overall, the Liebert 300 represents a comprehensive solution for precision cooling needs, integrating cutting-edge technology with user-focused design and energy-saving features. Its capability to adapt to changing environments and workloads makes it an essential component in maintaining the integrity and performance of critical infrastructure in today's technology-driven world. Whether for new installations or upgrades, the Liebert 300 stands out as a premier choice for ensuring optimal climate control in mission-critical applications.
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