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 54)

54 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 3 Protective Trip & Warning Functions
• GF Inhibit Time has expired, and
• GF Current is equal to or greater than the GF Trip Level for a time period
greater than the GF Trip Delay.
If the E3 Plus Overload Relay trips on a ground fault, the:
• TRIP/WARN LED will flash a red 4-blink pattern,
• bit 3 in Parameter 14, Trip Status, will set to 1,
• bit 0 of Parameter 21, Device Status, will set to 1,
• trip relay contact will open, and
• outputs will be placed in their Protection Fault state (if so programmed).
GF Inhibit Time, Parameter 35, allows the installer to inhibit a ground fault trip
from occurring during the motor starting sequence and is adjustable from 0…250
seconds.
GF Trip Delay, Parameter 36, allows the installer to define the time period a
ground fault condition must be present before a trip occurs and is adjustable from
0.0…25.0 seconds.
Parameter 37, GF Trip Level, allows the installer to define the ground fault
current at which the E3 Plus Overload Relay will trip and is adjustable from:
• 1.0…5.0 A (Catalog Number 193/592-EC2_ _)
• 20.0 mA…5.0 A (Catalog Number 193/592-EC3_ _ & 193/592-EC5_ _)
Ground Fault Trip Inhibit
Ground faults can quickly rise from low-level arcing levels to short circuit
magnitudes. A motor starting contactor may not have the necessary rating to
interrupt a high magnitude ground fault. In these circumstances it is desirable for
an upstream circuit breaker with the proper rating to interrupt the ground fault.
IMPORTANT The Protection Fault State of OUT A and OUT B is defined by:
• OUTA Pr FltState, Parameter 65
• OUTA Pr FltValue, Parameter 66
• OUTB Pr FltState, Parameter 71
• OUTB Pr FltValue, Parameter 72
IMPORTANT The ground fault inhibit timer starts after the maximum phase load
current transitions from 0 A to 30% of the device’s minimum FLA Setting
or the GF Current is greater than or equal to 50% of the device’s minimum
GF Current Setting. The E3 Overload Relay does not begin monitoring for
a ground fault condition until the GF Inhibit Time expires.
NOTE: The GF Trip Inhibit feature is only available in E3 Plus Overload Relays Series
B and later.