Liebert Distribution Monitoring LDM - Manual (Page 10)

Major Components
6
3.3 Large 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.
There can be up to two LIB boards per control board for a maximum total of sixteen 5-wire output
breakers.
3.4 Branch 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.
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.
3.5 Power 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.
!
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).
NOTE
The diameter of each CT hole is 0.354" (9mm). Wire diameter and thickness of insulation
cannot be larger than the CT opening.