Operation with Advanced Microprocessor with Graphics Control

3.5Operating Status

The Operating Status is intended to provide the user with displayed information about what the con- trol is calling for the system to do.

NOTE

There may be some time lapse before a specific component matches the displayed number.

For example: The display indicates the chilled water valve is 68% open. On a new call for cooling, it takes several seconds for the valve to travel from full closed to 68% open. So when the display reads 68%, it may take a few seconds for the valve to actually open 68%. Also, if the display indicates a com- pressor is operating but the compressor has not turned on yet, it may be off because of the short cycle control (see 4.4.1 - Short Cycle Control).

3.6View/Set Control Setpoints

Control setpoints can be reviewed and/or changed through the display. Refer to the following table to see the list of default setpoints and their allowable ranges.

Table 8

Default setpoints and ranges

 

 

 

 

 

 

Setpoint

Default

Range

 

 

 

Temperature Setpoint

72°F

40 to 90°F (5 to 32°C)

 

 

 

Temperature Sensitivity

2.0°F

1 to 9.9°F (0.6 to 5.6°C)

 

 

 

Humidity Setpoint

50%

20 to 80% RH

 

 

 

Humidity Sensitivity

5%

1 to 30% RH

 

 

 

High Temperature Alarm

80°F

35 to 95°F (2 to 35°C)

 

 

 

Low Temperature Alarm

65°F

35 to 95°F (2 to 35°C)

 

 

 

High Humidity Alarm

60%

15 to 85% RH

 

 

 

Low Humidity Alarm

40%

15 to 85% RH

 

 

 

 

3.7System Setup

Selecting SYSTEM SETUP will step to the following menu:

SETUP OPERATION

SELECT OPTIONS

CALIBRATE SENSORS

CALIBRATE VALVE ACTUATOR

SELECT CONTROL ALGORITHM (chilled water or SCR Reheats only)

SELECT HUMIDITY SENSING MODE

SET STATUS DISPLAY

CHANGE PASSWORDS

3.7.1Setup Operation

The SETUP OPERATION menu permits the review and/or adjustment of the unit configuration. This may include:

Cold Start Delay

This feature, also referred to as Positive Start or Winter Start Kit, allows for the low pressure switch to be ignored for the programmed time during a cold start of the compressor. Entering a “0” for this time will bypass this feature. A “1” will bypass the low pressure switch for one minute, a “2” for two minutes, etc. The programmed value can be from 0 to 3 minutes. This delay is factory set to 0 for water cooled, glycol cooled, and GLYCOOL units. Typically, only air cooled units need a “Winter Start” time.

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Liebert 3000 manual Operating Status, View/Set Control Setpoints, System Setup, Cold Start Delay

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.

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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.

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