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 52)

52 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 3 Protective Trip & Warning Functions
• Current Imbal is equal to or greater than 100% for a time period greater
than the programmed PL Trip Delay.
If the E3 Overload Relay trips on a phase loss, the:
• TRIP/WARN LED status indicator will flash a red 3-blink pattern,
• bit 2 in Trip Status, Parameter 14 will set to 1,
• bit 0 of Device Status, Parameter 21, will set to 1,
• trip relay contact will be open, and
• outputs will be placed in their Protective Fault state (if so programmed).
PL Inhibit Time, Parameter 33, allows the installer to inhibit a phase loss trip
from occurring during the motor starting sequence. It is adjustable from 0…250
seconds.
PL Trip Delay, Parameter 34, allows the installer to define the time period for
which a phase loss condition must be present before a trip occurs. It is adjustable
from 0.1…25.0 seconds.
Ground Fault Protection (E3
Plus)
In isolated or high impedance-grounded systems, core-balanced current sensors
are typically used to detect low level ground faults caused by insulation
breakdowns or entry of foreign objects. Detection of such ground faults can be
used to interrupt the system to prevent further damage or to alert the appropriate
personnel to perform timely maintenance.
The E3 Plus Overload Relay provides core-balanced ground fault detection
capability, with the option of enabling Ground Fault Trip, Ground Fault
Warning, or both. The ground fault detection method and range depends upon
the catalog number of the relay ordered.
IMPORTANTThe Protection Fault State of OUT A and OUT B is defined by:
• OUTA Pr FltState, Parameter 65,
• OUTA PrFltValue, Parameter 66,
• OUTB Pr FltState, Parameter 71, and
• OUTB Pr FltValue, Parameter 72.
IMPORTANTThe phase loss inhibit timer starts after the maximum phase of load current
transitions from 0 A to 30% of the device’s minimum FLA Setting. The E3
Overload Relay does not begin monitoring for a phase loss condition until
the PL Inhibit Time expires.