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Operation
15
5.0 OPERATION
The Liebert LDM is a factory-installed option to provide monitoring of the main breaker, branch cir-
cuit breakers and subfeed breakers. It may be installed in the Liebert PPC Precision Power Center,
Liebert FDC, Liebert FPC and Liebert RDC Remote Distribution Cabinet.
Software available on Liebert’s Web site (see 5.3 - Downloading the Software) can be installed on a
desktop or laptop computer (PC) to monitor status and configure breaker parameters and alarm set-
points. These monitoring and configuration functions are described in 5.4 - Using the Monitor Tool
and 5.5 - Using the Configuration Tool.
The Liebert LDM monitors and displays the parameters listed in Table 5.
Circuit identification and status of each breaker are also displayed. Parameters are updated every
500msec.
Table 5 Parameters monitored for breakers
Parameters
Displayed and monitored for each:
Panelboard
branch
circuit breaker
Panelboard main
circuit breaker and
SqD I-Line panelboard
SqD I-Line
panelboard
circuit breaker
Subfeed
circuit
breaker
Voltage — ✔ ——
Line-to-line — ✔ ——
Line-to-neutral — ✔ ——
Phase Current ✔✔✔✔
Neutral Current — ✔✔✔
Ground Current — ✔✔✔
kVA — ✔✔✔
kW ✔✔✔✔
kW-Hours ✔✔✔✔
Percent Load ✔✔✔✔
Power Factor — ✔✔✔
Crest Factor — ✔✔✔
Voltage Total Harmonic Distortion (THD) — ✔✔✔
Current Total Harmonic Distortion (THD) — ✔✔✔