Liebert LDM user manual Installing a Solid-Core Current Transformer

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Installation

4.2Installing a Solid-Core Current Transformer

! WARNING

A solid-core CT cannot be installed on a wire while current is flowing through the wire. Damage to burden resistor and CT will occur. Power needs to be removed prior to installing and/or removing any CT. CTs should be installed by qualified electricians only.

The CT for the panelboard main input circuit breaker is hard-wired to the connectors. Removing CT wires from the connector requires a pin extraction tool. Contact Liebert Services at 1-800-LIEBERT (1-800-543-2378) for assistance.

NOTE

When replacing or installing a CT, ensure the replacement CT has a secondary rating of 1A— for example, 100:1, 200:1 or 500:1. Using a higher-rated CT—for example, 100:5 or 500:5—will damage the burden resistors on the PBVI board.

Typically the three-phase and neutral wires utilize a CT rating of 100:1, 200:1 or 500:1, while the ground wire utilizes a CT rating of 100:1.

Route the circuit wire through the core of the CT and wire-tie the CT to the cable. Refer to the manu- facturer’s documentation for proper orientation to ensure accurate readings. Generally, CTs have an arrow, white dot or similar marking to indicate how to position the CT.

For the Liebert LDM, CTs have a white dot that must face the source on the three-phase wires and must face the load on the neutral and ground wires.

NOTE

When installing CTs for a large branch circuit breaker or subfeed, verify which monitoring board is installed.

•A PBVI board can support one subfeed per panelboard (if neutral and ground will be monitored) or up to three subfeeds if neutral and ground are not monitored.

•One LIB can support up to eight output and/or subfeed breakers.

•Two LIB boards are provided to support up to 16 output and/or subfeed breakers.

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Contents Liebert Distribution Monitoring LDM Page Table of Contents Tables Safety Instructions Glossary of Abbreviations Following abbreviations are used in this manualProduct Overview Branch Circuit Monitoring Control Board BCB Major ComponentsPart Number Description Phase CT Ground CT Neutral CT Panel Board Voltage-Current Board PbviCT matrix for the Liebert LDM Power Supply Assembly with EMI Filter Large Interface Board LIBBranch Circuit Monitoring Sensor Module BSM Installing a BSM CT Module Assembly InstallationConnecting Panelboards a and B Installing a Solid-Core Current Transformer Connecting a Current Transformer to the Pbvi Board Pin WiringWiring configuration of large branch circuit breakers Configuration 1 Four Modules Connector P3 aConnector P4 B CT Table for Pbvi BoardLB11 LB12 LB13 Connecting a Current Transformer to the LIB Board Four CTs Ground CT Three phases NeutralFirst Breaker Second Breaker Wiring configuration for LIB CT Table for LIBWiring configuration for LIB2 Operation Parameters monitored for breakersAlarms Alarm conditions and factory setpointsLDM Setup Port Connection CommunicationModbus Connection Using the Monitor Tool Downloading the SoftwareStarting the Monitor Tool COM port ConnectMonitor Menu Options Panel Status and Real-Time ClockMonitor menu options Mode Buttons Monitor mode buttonsMain Breaker Status Breaker StatusUsing the Configuration Tool Starting the Configuration ProgramTo Connect via COM Port To Work in Offline Mode COM port Work OfflineMain Configuration Window Overview Overview of main Configuration windowLoad a Configuration File from Disk Install Configuration Changes in the UnitSave the Configuration File to Disk Select Panel to View Select Breakers to ViewPanel Breakers view Auxiliary Breakers view Edit the Panel Properties or Set a Password Edit the Liebert LDM Unit PropertiesEdit the Breaker Properties Parameter Description To make a changeAdd or Delete a Circuit Breaker Adding a Circuit BreakerAdding a Subfeed Breaker Delete a Breaker Upgrading the Firmware Operation Progress Failed = Specifications ElectricalTroubleshooting / Faqs Page Ne t ItiTi n That

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.

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