Liebert LDM user manual Large Interface Board LIB, Branch Circuit Monitoring Sensor Module BSM

Major Components

3.3Large Interface Board (LIB)

The LIB provides the voltage attenuators for Square D I-Line panelboard voltages. The LIB monitors the current for the I-Line panelboard. The panelboard input CTs are connected to the LIB board. There are 42 CT inputs provided. The current inputs require the use of 1A secondary CT.

! WARNING

Before connecting a large CT to the PBVI board, note the CT MUST have 1A secondary. Connecting a 5A secondary type CT will damage the board and the CT.

To ensure the proper current ratio and accuracy, the CTs should be purchased through Emerson Network Power. See Table 1 for details. Contact your local Emerson Network Power representative or call Liebert Services at 1-800-LIEBERT (1-800-543-2378).

There can be up to two LIB boards per control board for a maximum total of sixteen 5-wire output breakers.

3.4Branch Circuit Monitoring Sensor Module (BSM)

The BSM—more commonly referred to as the CT Module—is packaged in an epoxy-filled plastic assembly. There are two designs: one for 1" center-to-center GE panelboards and one for 3/4" center- to-center for Square D panelboards. Each contains twenty-one 50A CTs that are rated up to 50A RMS 50/60 Hz.

NOTE

The diameter of each CT hole is 0.354" (9mm). Wire diameter and thickness of insulation cannot be larger than the CT opening.

For the 42-breaker position in-line panel boards, the Square D CT Module is designed to interlock end to end to maintain alignment between the breaker poles and the CT Module.

3.5Power Supply Assembly (with EMI Filter)

The power supply assembly is 120-240VAC (range +6, -13%) 50/60 Hz input, 24VDC output to provide logic level power for the BCB.

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