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3.2 Panel Board Voltage-Current Board (PBVI)
The PBVI board monitors two panelboards and provides the voltage attenuators for the two panel-
board voltages. The two sets of panelboard main breaker CTs are connected to the PBVI board.
Connections for the 18 large branch CTs are located on the PBVI board. The nine CTs on the A side of
the board are normally associated with the A-side voltages for power calculations. The B-side CTs are
normally associated with the B-side voltages. A cross-configuration tool allows changing that associa-
tion for subfeeds.
The 18 large branch CT inputs can also be used to monitor up to three subfeed circuit breakers. This
is configured using the Configuration tool (see 5.5 - Using the Configuration Tool). The CTs from
the B side of the PBVI are cross-configured to the A side so that the three sub-feeds appear within the
A-side panelboard register space. The 18 large branch breakers require CTs with 1A secondary.
!
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).
Table 1 CT matrix for the Liebert LDM
Part Number Description Phase CT Ground CT Neutral CT
528415G1-L 3 pole 100A Subfeed Breaker 5W CT Kit 23" Frame 100:1 100:1 200:1
528415G2-L 3 pole 125-225A Subfeed Breaker 5W CT Kit 23" Frame 200:1 100:1 500:1
528415G3-L 3 pole 250-400A Subfeed Breaker 5W CT Kit 23" Frame 500:1 100:1 500:1
531461G6-L 3 pole 0-100A I-Line & Subfeed Breaker 5W CT Kit 47" Frame 200:1 100:1 200:1
531461G9-L 3 pole 125-225A I-Line & Subfeed Breaker 5W CT Kit 47" Frame 200:1 100:1 500:1
531461G12-L 3 pole 250-400A I-Line & Subfeed Breaker 5W CT Kit 47" Frame 500:1 100:1 500:1
531461G18-L 3 pole 0-225A I-Line Breaker 3W CT Kit 47" Frame 200:1 — —
531461G19-L 3 pole 250-400A I-Line Breaker 3W CT Kit 47" Frame 200:1 — —
528461G13-L 1 pole 0-100A Branch Breaker CT Kit 100:1 — —
528415G14-L 2 pole 0-100A Branch Breaker CT Kit 100:1 — —
528415G15-L 3 pole 0-100A Branch Breaker CT Kit 100:1 — —