Introduction

1.0INTRODUCTION

The Liebert OpenComms™ EM is a compact, half-duplex device designed to monitor temperature, humidity, water detection and contact closure and notify personnel when those conditions exceed user-defined limits.

The OpenComms EM is available in several models, which vary in size and number and types of ports. All models have sensor ports to monitor temperature, humidity, water detection and contact closure, and all models have either an external or built-in temperature/humidity sensor:

EM

• has two sensor ports

Controller

• ships with an external sensor to detect temperature only (TMNET kit) or

 

both temperature and humidity (THCMNET kit)

has no serial ports

takes up zero U rack space

EM PDU • has two sensor ports

Controller • ships with an external sensor to detect temperature only (TMPDUNET kit) or both temperature and humidity (THCMPDUNET kit).

has two serial ports to monitor Liebert MP Advanced Power Strips

takes up zero U rack space

vEM-14 • has four sensor ports

Controller • has a built-in temperature and humidity sensor

has two serial ports to monitor Liebert MP Advanced Power Strips

has 10 dry contact inputs

takes up 1U rack space

Sensor Ports

The OpenComms EM has sensor ports capable of monitoring temperature, humidity, water detection and contact closure through sensors that may be purchased separately (see Table 3). The unit’s auto- sensing capability can determine which type of sensor is connected, making the unit ready to plug into your operation. Default settings for alarm limits may be changed through a Web interface.

Ethernet Ports

The unit has an Ethernet port for connection to a network, which provides access to the Web interface and the capability of receiving alerts when monitored conditions reach alarm status. The OpenComms EM may also be configured to send e-mail alerts and SNMP traps over the network.

Modem Port

A modem port provides the capability of sending pager messages to notify personnel of alarm condi- tions in the monitored area.

Web Interface

A Web interface makes it easy to view monitoring data in tabular and graphic formats, configure the device for alarm thresholds and set up automatic e-mail and pager notifications when a level in a monitored area crosses a predefined threshold.

Serial Ports (EM PDU / vEM-14 Controllers)

EM PDU and vEM-14 controllers have two serial ports that are ideal for monitoring Liebert Managed Power (MP) Advanced Power Strips. Power, voltage, current and temperature levels can be monitored with user-configured alarm thresholds. In addition, some MP Advanced Power Strip models allow each receptacle on the power strip to be turned on or off through the Web interface.

Typical Applications

An OpenComms EM is highly useful in monitoring:

Enclosures, particularly those housing electronic equipment such as servers or telephone switching equipment sensitive to temperature, humidity and power fluctuations

Process Areas, such as areas where environmentally sensitive chemical reactions occur

A closet or an area of a room where temperature levels are important, for example, an area that houses many servers, where you want to verify the area or closet doesn’t get too hot

1

Page 7
Image 7
Liebert EM manual Introduction

EM specifications

The Liebert EM is a state-of-the-art, modular and scalable cooling solution designed to meet the needs of today's data centers and IT environments. This innovative unit offers unmatched precision and flexibility, making it ideal for facilities that require meticulous temperature control and energy efficiency.

One of the main features of the Liebert EM is its modular design, allowing for easy expansion and customization based on the specific requirements of a facility. This scalability ensures that organizations can efficiently adapt to changing cooling demands without the need for significant infrastructure changes. The system can be configured in various capacities, making it suitable for spaces of different sizes and cooling needs.

Incorporating advanced technologies, the Liebert EM utilizes inverter-driven compressors, allowing for variable refrigeration capacity. This feature optimizes energy consumption, reducing operational costs while maintaining precise temperature control. The unit is designed with built-in smart controls that enable real-time monitoring and adjustments, ensuring enhanced performance and efficiency across the entire cooling system.

The Liebert EM also comes equipped with EC (Electronically Commutated) fans, which contribute to its energy efficiency by adjusting their speed according to the cooling load. This not only ensures adequate airflow but also minimizes energy waste, leading to lower overall operating costs.

Furthermore, the system features intelligent connectivity options that facilitate integration with existing building management systems. This capability allows for centralized monitoring and control, empowering facility managers to maintain optimal conditions and respond quickly to any fluctuations in temperature or humidity.

Safety and reliability are also paramount in the design of the Liebert EM. The unit includes comprehensive backup systems and redundancy features to ensure continuous operation even in the event of a component failure. This reliability is crucial for critical applications where downtime can result in significant losses.

In summary, the Liebert EM stands out as a versatile and high-performance cooling solution, equipped with advanced technologies that offer scalability, energy efficiency, and precise temperature control. Its modular design, coupled with intelligent control options, makes it an essential component for modern data centers looking to optimize their cooling infrastructure while ensuring reliability and reducing operational costs.