Eaton PDI JCOMM, Installation And Operation Manual

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Eaton PDI JCOMM Enclosure Installation and Operation Manual P-164001107—Rev 01 39
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Acquisition board The central component of a BCMS; PCB containing BCMS software, including points list, that accumulates
monitoring data from CTs, computes derived information, declares alarms, and presents power monitoring
information to displays and to building management systems.
BCMS Branch Circuit Monitoring System.
BCMS device Power distribution elements monitored by a single points list (or Modbus register map) and addressed by a
single Modbus address. Example: a panelboard is a BCMS device because it is monitored with one points
list and has one Modbus address. An acquisition board can monitor three BCMS devices—two panelboards
and one set of subdistribution feeds.
BMS Building management system
CRU Customer-replaceable unit.
CT Current transformer.
Modbus RTU An industrial communications protocol.
Modbus TCP Modbus protocol with TCP, which allows higher transmission speeds.
PDU Power Distribution Unit.
points list Modbus register map.
RPP Remote Power Panel
RTU Remote terminal unit; see Modbus RTU.
scale factor
Ratio of current measured with a current transformer (or voltage by the acquisition board) and an
independent measure given by a power meter; used in calibrating BCMS CT measurements.
SNMP Simple Network Management Protocol.
subdistribution A large circuit from a PDU that does not feed that PDU’s panelboards, but rather runs to another unit,
typically an RPP.
THD Setup option for measuring total harmonic distortion.