Operation with Advanced Microprocessor Controls

Select Control Type

•Intelligent (Chilled Water only)

•Proportional (all unit types)

•Tunable PID (Chilled Water or SCR Reheats only)

The type of system control method used by the microprocessor can be selected from the front panel. The default setting is Intelligent, which approximates the actions that a human operator would take to maintain precise, stable control. The control logic uses Artificial Intelligence techniques including “fuzzy logic” and “expert systems” methods to maintain precise, stable control and increase reliability by reducing component cycles. Proportional is a standard control method that uses one gain factor (temperature sensitivity adjustment). Tunable PID (Proportional, Integral, and Derivative) uses three gain factors selected by the operator. PID allows precision tuning, but requires an experienced operator and seasonal adjustments. Note that if PID is selected, it is used for temperature control while humidity will continue to use Proportional control. Refer to 4.0 - System Performance with Advanced Microprocessor Controls for more detail on types of controls.

Setup Alarms

Selecting SETUP ALARMS will step to the following menu:

•SET TIME DELAYS

•ENABLE ALARMS

•ENABLE COMMON ALARM

•SET CUSTOM ALARMS

Each individual alarm can be programmed with a time delay from 0 to 255 seconds. Each individual alarm can be ENABLED or DISABLED and each individual alarm can be programmed to energize or not to energize the Common Alarm Relay.

Set Time Delays—By programming a time delay for an alarm, the system will delay the specified amount of time before recognizing the alarm. The alarm condition must be present for the amount of time programmed for that alarm before it will be annunciated. If the alarm condition goes away before the time delay has timed out, the alarm will not be recognized and the time delay timer will be reset. For software alarms such as Loss of Power, Short Cycle, and Low Suction Pressure, a time delay will only delay the annunciation of that alarm. The condition of the alarm is not applicable because the condition has already occurred. For these alarms the time delay should be left at the fac- tory default of 0. Table 5, below, shows the default time delays for each alarm.

Table 5

Alarm default time delays

 

 

Default Time

 

Alarm

Delay (seconds)

Humidifier Problem

2

High Head Pressure

2

Change Filter

2

Loss of Air flow

3

Custom Alarm #1

0

Custom Alarm #2

0

Custom Alarm #3

0

Custom Alarm #4

6

High Temperature

30

Low Temperature

30

High Humidity

30

Low Humidity

30

Low Suction Pressure

0

Short Cycle

0

Compressor Overload

2

Main Fan Overload

5

Loss of Power

0

9

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Liebert 3000 manual Select Control Type, Setup Alarms, Alarm default time delays, Default Time, Alarm Delay seconds
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3000 specifications

The Liebert 3000 is a cutting-edge power protection solution designed to provide reliable and efficient backup power for critical applications. This uninterruptible power supply (UPS) system is engineered to safeguard sensitive electronic equipment from power disturbances, ensuring uninterrupted operations in data centers, telecommunications, and industrial environments.

One of the standout features of the Liebert 3000 is its high-efficiency design. With an efficiency rating of up to 94%, the system minimizes energy loss, resulting in lower operational costs and a reduced carbon footprint. This is particularly important in today's environmentally conscious climate, as organizations strive to meet sustainability goals while maintaining top-tier performance.

The Liebert 3000 employs advanced technologies to enhance its functionality. It incorporates online double-conversion technology, which provides a continuous supply of clean and regulated power. This technology ensures that connected loads receive stable voltage and frequency, shielding them from voltage spikes, sags, and outages. Additionally, the UPS offers features such as automatic battery testing, which helps ensure peak battery performance and reliability.

Another key characteristic of the Liebert 3000 is its modular design, allowing for flexible scalability. This means that organizations can easily expand the capacity of their UPS system as their power needs grow, without the need for extensive system overhauls. The modular architecture also facilitates simplified maintenance and reduces downtime, as individual modules can be serviced without interrupting power to the critical load.

The system is equipped with comprehensive monitoring and management capabilities. The Liebert 3000 provides real-time data on power usage, battery status, and system performance, enabling facility managers to make informed decisions and proactively address potential issues. The integration of remote management tools allows for seamless monitoring from anywhere, providing peace of mind for operators.

Overall, the Liebert 3000 combines high efficiency, advanced technology, and flexible design to deliver a robust power protection solution. Its reliability and performance make it a preferred choice for organizations seeking to protect their critical infrastructure while enhancing operational efficiency and sustainability. As businesses continue to rely on technology for their everyday operations, the Liebert 3000 stands out as a dependable safeguard against the uncertainties of power quality.
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