Installation

4.5Connecting a Current Transformer to the LIB Board

LIB can monitor eight 5-wire output/subfeed breakers. Two LIB boards are provided to support up to 16 output and/or subfeed breakers. If subfeed breakers are ordered with the unit, the phase CTs are installed and wired to the LIB. The neutral and ground CTs are also factory-supplied and wired to the LIB.

Since the CTs must be installed on the subfeed breaker’s neutral and ground cables, they cannot be installed in the factory. They are located in the bottom of the unit in front of the transformer.

CTs have an arrow, white dot or similar marking that depicts how to position the CT to ensure accu- rate readings. The arrow, white dot or similar marking must face the load when installing the CT on the ground and neutral cable. Route the neutral and ground cable through the core of the CTs and wire-tie the CT to the cable.

If subfeed breakers are installed in the field, up to five CTs may be installed to monitor a subfeed breaker (three phases, neutral and ground). The neutral and ground CTs may be omitted if monitor- ing of neutral and ground is not required.

The designators on the LIB are different from those on the PBVI board.

CT1 (Phase A white wire) begins on TB1 CT1+ and the black wire connects to CT1-.

The Ground CT for the first subfeed/output circuit breaker connects to TB4 CT35.

Four CTs

Ground CT

(three phases

 

and neutral)

 

Refer to the example below and Tables 3 and 4 for wiring configuration details.

Example: The above pictures show how to install CTs for a subfeed or I-Line output circuit breaker with neutral and ground being monitoring. The CTs should be wired as follows:

 

First Breaker

 

 

Second Breaker

 

 

 

 

 

 

 

CT1+

Phase A CT

 

White wire

CT5+

Phase A CT

White wire

 

 

 

 

 

 

 

CT1-

Phase A CT

 

Black wire

CT5-

Phase A CT

Black wire

 

 

 

 

 

 

 

CT2+

Phase B CT

 

White wire

CT6+

Phase B CT

White wire

 

 

 

 

 

 

 

CT2-

Phase B CT

 

Black wire

CT6-

Phase B CT

Black wire

 

 

 

 

 

 

 

CT3+

Phase C CT

 

White wire

CT7+

Phase C CT

White wire

 

 

 

 

 

 

 

CT3-

Phase C CT

 

Black wire

CT7-

Phase C CT

Black wire

 

 

 

 

 

 

 

CT4+

Neutral CT

 

White wire

CT8+

Neutral CT

White wire

 

 

 

 

 

 

 

CT4-

Neutral CT

 

Black wire

CT8-

Neutral CT

Black wire

 

 

 

 

 

 

 

CT35+

Ground CT

 

White wire

CT36+

Ground CT

White wire

 

 

 

 

 

 

 

CT35-

Ground CT

 

Black wire

CT36-

Ground CT

Black wire

 

 

 

 

 

 

 

If more output or subfeed CTs need to be installed, continue in the same pattern shown above.

Connect the Phase A CT for the second breaker on CT5 (white wire to CT5+, black to CT5-).

Connect the Ground CT for the second breaker to CT36 (white wire to CT36+, black to CT36-).

Continue the same pattern until all CT connections are used or there are no more output or sub- feed CTs to add.

12

Page 16
Image 16
Liebert LDM user manual Connecting a Current Transformer to the LIB Board, Four CTs Ground CT Three phases Neutral

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.