Vertiv™ | Liebert® LDMF™ Distribution Monitoring User Manual | 3
2.0 PRODUCT OVERVIEW
The Liebert LDMF monitors the main panelboard circuit breaker and individual panelboard
branch circuit breakers. The measurements are used to report the voltage, current and alarm
conditions for each breaker. The Liebert LDMF utilizes branch circuit sensor modules and
individual current transformers (CT) to monitor current. In addition, the Liebert LDMF monitors
options like subfeed and output circuit breakers and provides a full array of power parameters
and alarms.
The Liebert LDMF is available as an option for the Liebert PPC
™
, Liebert FDC
™
, Liebert FPC
™
,
Liebert RX
™
and Liebert RDC
™
.
The Liebert LDMF system can communicate with a Building Management System (BMS) and
Liebert SiteScan
®
Web via optional Liebert IntelliSlot
™
cards or Liebert SiteLink
®
interface.
The Liebert LDMF consists of a monitor board, interface board, optional local display and Branch
Sensor Modules (BSM).
The Liebert LDMF is capable of receiving input from current branch sensor modules. The sensor
module (BSM) contains 100A current transformers (CTs) encapsulated in an epoxy-filled plastic
enclosure designed to be mounted next to the panelboard. Sensor modules are designed to work
3/4" or 1"-spaced panelboards. If a sensor module CT fails, connections are provided for up to six
replacement CTs. The optional CTs can be attached directly to the load cable feeding the failed
CT.
Higher-rated CTs may be used for monitoring optional subfeed circuit breakers. For subfeed
breakers, such as main panelboard breakers, the Liebert LDMF monitors not only the three-phase
current but also the ground and neutral current. These subfeed circuit breakers are in addition to
the panelboard circuit breakers that can be monitored through the BSM. The Liebert LDMF can
accommodate 18 individual large current transformers.
If your Liebert power center is supplied with a Square D
®
I-Line
™
panelboard, the Liebert LDMF
can monitor it as well as its output breakers. A PM4 Large Interface Board (PLIB) replaces the
panelboard PM4 Interface Board (PIB) and can monitor up to 42 CTs. Each PLIB can monitor
eight four-wire or five-wire I-Line and/or subfeed breakers including ground and neutral current.
There are two (2) PLIBs per monitor board that can monitor up to 16 five-wire I-Line and/or
subfeed breakers.
The Liebert LDMF system includes three Liebert IntelliSlot ports for remote communication.
Optional Liebert IntelliSlot cards can provide the following remote communications:
• IS-WEBS card for SNMP/WEB with RJ-45 connection to Ethernet LAN
• IS-485S card for Modbus 485, 2-wire connection
• IS-IPBMS card for Modbus IP, with RJ-45 connection to Ethernet LAN
• IS-UNITY-DP card for HTTP/HTTPS, Vertiv Protocol, e-mail, SMS, SNMP v1/v2c/v3, BACnet IP/MSTP and
Modbus TCP/RTU output using a serial RS-485 two-wire connection
In addition to Liebert LDMF remote communications, an optional local display offers easy-to-use
viewing of electrical data for various branch breakers as well as alarm details such as the type and
source of each alarm.
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