Operation

5.1Alarms

The Liebert LDM constantly monitors configured parameters for normal values. When the unit detects an alarm condition, it annunciates and displays alarm messages via the Monitor program (see 5.4 - Using the Monitor Tool).

Alarms must be manually reset after the alarm condition has been corrected and may be reset through Modbus.

To facilitate troubleshooting:

All alarms are stored in non-volatile memory to protect against erasure by a power outage.

Alarms are saved in an event log. The event log stores up to 128 events using a first-in, first-out format (FIFO).

All alarm thresholds for monitored parameters are adjustable by using the Configuration tool to match site requirements (see 5.5 - Using the Configuration Tool).

Table 6 shows the types of alarms for the various types of breakers, along with a description, factory default setpoints and allowable range for each.

Table 6

Alarm conditions and factory setpoints

 

 

 

 

 

 

 

 

 

 

Alarm

Description

Default setting

Range

 

 

 

 

Branch Breakers

 

 

 

 

 

 

 

 

Overcurrent Warning

Current exceeds 75% of breaker amps

15A

0-75%

 

 

 

 

 

Overcurrent Alarm

Current exceeds 80% of breaker amps

16A

10-80%

 

 

 

 

 

 

 

 

 

 

0%, which

 

Low Current Alarm

Minimum current level of a branch breaker

disables

0-70%

 

 

 

 

the alarm

 

Panelboard Main Breaker and SqD I-Line Panelboard

 

 

 

 

 

 

 

Phase Overcurrent Warning

Current exceeds 75% of breaker amps

170A

0-75%

 

 

 

 

 

Phase Overcurrent Alarm

Current exceeds 80% of breaker amps

180A

10-80%

 

 

 

 

 

Neutral Overcurrent Alarm

Current exceeds 95% of breaker amps

214A

10-200%

 

 

 

 

 

Ground Overcurrent Alarm

Current exceeds 5 amps

5A

1-50A

 

 

 

 

 

 

Overvoltage Alarm

At least one of the line-to-line voltages exceeds +6% of

0-50%

nominal

 

 

 

 

 

Undervoltage Alarm

At least one of the line-to-line or line-to-neutral voltages

0-50%

falls below -13% of nominal

 

 

 

 

 

Subfeed Breakers and I-Line Output Breakers

 

 

 

 

 

 

 

Phase Overcurrent Warning

Current exceeds 75% of breaker amps

170A

0-75%

 

 

 

 

 

Phase Overcurrent Alarm

Current exceeds 80% of breaker amps

180A

10-80%

 

 

 

 

 

 

 

 

 

 

0%, which

 

Low Current Warning

Minimum current level of a branch breaker

disables

0-70%

 

 

 

 

the alarm

 

Neutral Overcurrent Alarm

Current exceeds 95% of breaker amps

214A

10-200%

 

 

 

 

 

Ground Overcurrent Alarm

Current exceeds 5 amps

5A

1-50A

 

 

 

 

Summary Alarm

Detects and annunciates upon occurrence of any alarm

 

 

 

 

 

 

Panelboard Summary Alarm

Detects and annunciates upon occurrence of branch or

panelboard main breaker alarm

 

 

 

 

 

16

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Liebert LDM user manual Alarms, Alarm conditions and factory setpoints

LDM specifications

Liebert LDM (Liebert Digital Monitor) is an advanced thermal management solution, specifically designed to enhance the performance and reliability of critical infrastructure systems. This innovative product from Vertiv caters to the growing demand for efficient cooling solutions in data centers, telecommunication sites, and other facilities requiring precise environmental control.

One of the standout features of the Liebert LDM is its advanced monitoring capabilities. The device is equipped with numerous sensors that measure crucial parameters, including temperature, humidity, and airflow. These measurements help operators analyze the cooling efficiency of their systems and ensure optimal operating conditions. The real-time data provided by the Liebert LDM allows for proactive maintenance, reducing the risk of equipment failure due to overheating or improper humidity levels.

The Liebert LDM employs sophisticated algorithms to optimize cooling performance. Its ability to analyze data trends plays a vital role in preventing hot spots and ensuring uniform cooling throughout the facility. This technology enhances the overall efficiency of cooling systems, which translates into reduced energy consumption and lower operating costs.

Another key characteristic of the Liebert LDM is its modular design. This flexibility allows users to scale their monitoring capabilities based on the size and complexity of their cooling setup. Whether a small server room or a large data center, the Liebert LDM can be tailored to meet specific operational needs.

Integration is another core advantage of the Liebert LDM. It seamlessly connects with various management systems and can be monitored through user-friendly interfaces. This interoperability ensures that facility managers can easily track performance metrics and integrate the Liebert LDM into their existing operational protocols.

The construction of the Liebert LDM is designed with durability and longevity in mind. Built to withstand the rigors of commercial use, the device features robust housing and weather-resistant components. This resilience ensures that the Liebert LDM remains a reliable tool within critical environments.

In summary, the Liebert LDM is a sophisticated thermal management solution combining precision monitoring, energy efficiency, modular flexibility, seamless integration, and robust design. As technology evolves, maintaining optimal environmental conditions becomes increasingly crucial. The Liebert LDM addresses these challenges, ensuring that critical systems operate reliably and efficiently in the face of rising demands.