GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 67)

Power Management Control System
Appendix A – IED Descriptions
57
• Waveform capture
These parameters can also be viewed at the host
computer. Requests may be entered locally or from the
host.
The Meter has two relay outputs that can be
programmed to provide IED protection.
POWER LEADER Modbus Monitor
The POWER LEADER Modbus Monitor provides a
central station for viewing metering and status
information collected from multiple remote power
management IEDs. The Monitor may be mounted in
equipment or independently and offers two RS-485
ports for connection to one or two separate RS-485
networks. Up to two Modbus Monitors may be installed
on a single RS-485 network, providing multiple
locations to view data.
Features
• Easy-to-use, menu-driven user interface
• Large, high-visibility display
• Customizable display of data
• View the event log of the previous 50 events with
time and date stamp
• View PMCS log – displays last 50 events logged
by the PMCS Event Logger, regardless of which
network the events happened on
• Universal power supply accepts 100–240 Vac,
125–250 Vdc
POWER LEADER Repeater
The POWER LEADER Repeater regenerates signals on
long commnet segments and allows the range of the
commnet segment to be extended beyond the 1000-foot
limit. See Section 2–1 for configuration rules to create
extended-range commnet segments.
Power Quality Meter (PQM)
When continuous monitoring of a three-phase system is
required, the Power Quality Meter (PQM) is an ideal
choice. It provides metering for current, voltage, real
and reactive power, energy use, cost of power, power
factor, and frequency. Programmable setpoints and
four assignable output relays allow control functions to
be added for specific applications. These include basic
alarm on over/undercurrent or -voltage, unbalance,
demand-based load shedding, and capacitor power
factor-correction control. More complex control is
possible using the four switch inputs, which also can be
used for status, such as breaker open or closed and flow
information.
The PQM is a data-gathering IED for a plant-
automation system that integrates process, instrument,
and electrical requirements. All monitored values are
available via two digital RS-485 communication ports
running the Modbus protocol. If analog values are
required for direct interface to a PLC, any of the
monitored values can be output as a 4–20 mA signal to
replace up to four separate transducers. A process
variable can be measured using the analog input. An
RS-232 communication port can be connected to a PC
for simultaneous access of information by other plant
personnel via the front panel.
With increasing use of electronic loads, such as
computers, ballasts, or variable-frequency drives, the
quality of the power system is important. With the
PQM’s harmonic-analysis option, any phase current or
voltage can be displayed and the harmonic content
calculated. Knowing the harmonic distribution, you can
take action to prevent overheated transformers, motors,
capacitors, and neutral wires and nuisance breaker
trips. Redistribution of system loading can also be
determined. Waveform and chart recorder printouts
available from the PQM assist in problem diagnosis.
Applications
• Metering of distribution feeders, transformers,
generators, capacitor banks, and motors
• Medium- and low-voltage systems
• Commercial, industrial, utility
• Flexible control for demand load shedding,
power factor, etc.
• Power quality analysis
Measure/Control
• A, V, W, var, VA, varh, Wh, PF, Hz unbalance
• A, W, var, VA demand
• Load shedding
• Power factor control
Communication
• Ports: RS232 front, dual RS-485 rear
• Modbus RTU protocol
• Mini RTU: digital four in/four out
• Analog one in/four out
• Local/remote display of all values
Maintenance
• Harmonic analysis through 62nd harmonic with
THD and TIF