Liebert LDM user manual Operation, Parameters monitored for breakers

Operation

5.0OPERATION

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.

Table 5 Parameters monitored for breakers

		Displayed and monitored for each:
	Panelboard	Panelboard main	SqD I-Line	Subfeed
	branch	circuit breaker and	panelboard	circuit
Parameters	circuit breaker	SqD I-Line panelboard	circuit breaker	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)	—	✔	✔	✔

Circuit identification and status of each breaker are also displayed. Parameters are updated every 500msec.

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