Liebert LDM user manual Connecting a Current Transformer to the Pbvi Board, Pin Wiring

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Installation

4.3Connecting a Current Transformer to the PBVI Board

If subfeed breakers are ordered with the unit, the phase CTs are installed and wired to the PBVI. The neutral and ground CTs are also factory-supplied and wired to the PBVI board.

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 on the cable to ensure accurate 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.

On large branch circuit breakers, ground and neutral is not monitored.

There are two 18-pin terminal blocks on the PBVI for large branch circuit breakers and/or subfeeds— one for Panelboard A and one for Panelboard B.

The circuit board is marked with a triangle ▼ to indicate Pin 1.

•Pin 1 should be used for the white wire of CT1 (Phase A)

•The black wire should be connected to Pin 2.

•The same pattern will follow for the remaining CTs.

After all CTs are installed, use the Configuration tool to label and set alarm parameters. To configure the Liebert LDM, see 5.5.11 - Add or Delete a Circuit Breaker.

If the Power Distribution Center is supplied with optional isolated ground, the isolated ground circuit can be monitored by the Liebert LDM.

•Connect the isolated ground CT to Pins 17 and 18 on the two 18-pin terminal blocks on the PBVI.

•Connect the isolated ground CT white wire to Pin 17 and the CT black wire to Pin 18.

CTs for the

CT for neutral

Five CT

three phases

and ground

connection

Refer to the following example and Table 2 for wiring configuration details.

Example: When installing a subfeed breaker where the three phases, neutral and ground will be monitored, the CTs should be wired as follows:

Pin

Wiring

1

Phase A CT

White wire

2

Phase A CT

Black wire

3

Phase B CT

White wire

4

Phase B CT

Black wire

5

Phase C CT

White wire

6

Phase C CT

Black wire

7

Neutral CT

White wire

8

Neutral CT

Black wire

9

Ground CT

White wire

10

Ground CT

Black wire

If neutral and ground will not be monitored, Pins 7-10 may be used instead for a second subfeed (Phase A and Phase B CTs).

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Contents Liebert Distribution Monitoring LDM Page Table of Contents Tables Safety Instructions Following abbreviations are used in this manual Glossary of AbbreviationsProduct Overview Major Components Branch Circuit Monitoring Control Board BCBPanel Board Voltage-Current Board Pbvi Part Number Description Phase CT Ground CT Neutral CTCT matrix for the Liebert LDM Large Interface Board LIB Power Supply Assembly with EMI FilterBranch Circuit Monitoring Sensor Module BSM Installation Installing a BSM CT Module AssemblyConnecting Panelboards a and B Installing a Solid-Core Current Transformer Pin Wiring Connecting a Current Transformer to the Pbvi BoardConfiguration 1 Four Modules Connector P3 a Wiring configuration of large branch circuit breakersConnector P4 B CT Table for Pbvi BoardLB11 LB12 LB13 Four CTs Ground CT Three phases Neutral Connecting a Current Transformer to the LIB BoardFirst Breaker Second Breaker CT Table for LIB Wiring configuration for LIBWiring configuration for LIB2 Parameters monitored for breakers OperationAlarm conditions and factory setpoints AlarmsCommunication LDM Setup Port ConnectionModbus Connection Downloading the Software Using the Monitor ToolStarting the Monitor Tool COM port ConnectPanel Status and Real-Time Clock Monitor Menu OptionsMonitor menu options Monitor mode buttons Mode ButtonsMain Breaker Status Breaker StatusStarting the Configuration Program Using the Configuration ToolTo Connect via COM Port To Work in Offline Mode COM port Work OfflineOverview of main Configuration window Main Configuration Window OverviewInstall Configuration Changes in the Unit Load a Configuration File from DiskSave the Configuration File to Disk Select Breakers to View Select Panel to ViewPanel Breakers view Auxiliary Breakers view Edit the Liebert LDM Unit Properties Edit the Panel Properties or Set a PasswordParameter Description To make a change Edit the Breaker PropertiesAdding a Circuit Breaker Add or Delete a Circuit BreakerAdding a Subfeed Breaker Delete a Breaker Upgrading the Firmware Operation Progress Failed = Electrical SpecificationsTroubleshooting / Faqs Page Iti Ne tTi n That

LDM specifications

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