User Manual

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 159
Chapter 8
Power Parameters
Introduction
The E3 Plus model EC5 offers power based motor protection. This model also
provides maintenance personnel with power based diagnostic information when
investigating an unplanned shut down or performing energy management. This
chapter provides information for the power monitoring and setup parameters for
the E3 Plus Overload Relay model EC5.
Phase Power Reporting
Power Range
The E3 Plus model EC5 provides power based diagnostic information that
includes real power (kW), reactive power (kVAR), apparent power (kVA), and
power factor (PF). The relay also provides energy based diagnostic information
that includes kWh, kVARh, kVAh, kW Demand, kVAR Demand, and kVA
Demand. The relay is capable of sensing power and energy ranging from 0V L-L
to 690V L-L for frequencies ranging from 20 Hz to 250 Hz. The relay supports
the following voltage systems:
• Single Phase (2 Wire)
• Delta (Direct Connection)
• Wye (Direct Connection)
• Open Delta (with 2 Potential Transformers)
• Delta with PT (with 3 Potential Transformers)
The E3 Plus model EC5 is intended to be used in applications that represent
quadrants I and IV of the power circle shown in Explanation of Power Parameter
Signs