Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 35)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 36
Chapter
3
Protective Trip and Warning Functions
Introduction The purpose of this chapter is to provide detailed information regarding the
protective trip and warning functions of the EC4 Current Monitoring Relay. In
this chapter, you will find considerable mention given to programming
parameters as they relate to these functions. For complete descriptions of the
programming parameters, refer to Chapter 5 — Programmable Parameters.
Trip Enable Parameter 24, Trip Enable, allows the installer to enable or disable the desired
protective functions separately. The overcurrent, undercurrent, and
communication fault trip functions are enabled from the factory.
Warning Enable Parameter 25, Warning Enable, allows the installer to enable or disable the desired
warning functions separately. All warning functions are disabled from the factory.
Overcurrent Protection The EC4 Current Monitoring Relay provides UC/OC protection through true
RMS current measurement of the individual phase currents of the connected
loads. For
Undercurrent & Overcurrent Trip and Warning Level parameters, a
warning or trip will occur when the programmed conditions are satisfied.
IMPORTANT The EC4 Current Monitoring Relay requires undercurrent
(UC)/overcurrent (OC) to be enabled at all times. The EC4 Current
Monitoring Relay requires either UC/OC to be enabled at all times.
ATTENTION: The Trip Enable settings should not be altered during
machine operation, as unexpected behavior of the outputs could
occur. This may result in an unintended actuation of controlled
industrial equipment, with the potential for machine damage or
serious injury to personnel.