CHAPTER 1: OVERVIEW
PQMII POWER QUALITY METER – INSTRUCTION MANUAL 1–5
1.2 Standard Features
1.2.1 Metering
True RMS monitoring of Ia, Ib, Ic, In, Van, Vbn, Vcn, Vab, Vbc, Vca, voltage/current
unbalance, power factor, line frequency, watts, vars, VA, Wh, varh, VAh, and demand
readings for A, W, vars, and VA. Maximum and minimum values of measured quantities are
recorded and are date and time stamped.
A 40-character liquid crystal display is used for programming setpoints and monitoring
values and status.
1.2.2 Alarms
Alarm conditions can be set up for all measured quantities. These include overcurrent,
undercurrent, neutral current, current unbalance, voltage unbalance, phase reversal,
overfrequency, underfrequency, power factor, switch inputs, etc. The alarm messages are
displayed in a simple and easy to understand English format.
1.2.3 Communications
The PQMII is equipped with one standard RS485 port utilizing the Modbus or DNP
protocols. This can be used to integrate process, instrumentation, and electrical
requirements in a plant automation system by connecting several PQMII meters together
to a DCS or SCADA system. A PC running the EnerVista PQMII Setup Software can change
system setpoints and monitor values, status, and alarms. Continuous monitoring
minimizes process downtime by immediately identifying potential problems due to faults
or changes from growth.
The PQMII also includes a front RS232 port which can be used for the following tasks:
• data monitoring
• problem diagnosis
•viewing event records
•trending
• printing settings and/or actual values
• loading new firmware into the PQMII
1.2.4 Future Expansion
Flash memory is used to store firmware within the PQMII. This allows future product
upgrades to be loaded via the serial port.
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