Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 147)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 147
Chapter
7
Voltage Parameters
Introduction The E3 Plus model EC5 has the capability to protect against poor voltage quality
by offering voltage based protection. The user can prevent a contactor from
energizing if the voltage is either too high or too low. This model also provides
maintenance personnel with voltage based diagnostic information when
investigating an unplanned shut down. This chapter provides information for the
voltage monitoring and setup parameters for the E3 Plus Overload Relay model
EC5.
Phase Voltage Reporting Voltage Range
The E3 Plus model EC5 utilizes a true RMS algorithm to calculate the RMS
value of the voltage that exists on L1, L2, and L3. The relay is capable of sensing
voltages 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 or with 3 Potential Transformers)
• Open Delta (with 2 Potential Transformers)
• Delta with PT (with 3 Potential Transformers)
The following chart illustrates the reported voltage parameters based on the
chosen voltage mode. Parameters that do not have an "X" will report 0.
IMPORTANT The E3 Plus model EC5 will report 0 V if the voltage is below
50V L-L .
IMPORTANT The E3 Plus model EC5 is capable of reporting values greater
than 690V L-L and for frequencies less than 40 Hz or greater
than 80 Hz, but the accuracy of the value may be
compromised.
IMPORTANT The E3 Plus model EC5 calculates frequency based on the
voltage signal on L1.