Rockwell Automation Allen-Bradley E300, User Manual

Page: 143 / 546

Rockwell Automation Publication 193-UM015D-EN-P - February 2015 143
Protective Trip and Warning Functions Chapter 6
Table 175 - Overload Reset Level (Parameter 248)
Ground Fault Filter
An E300 Electronic Overload Relay can filter ground fault currents for High
Resistance Grounded (HRG) systems from its current-based protection trip and
warning functions, which include:
•
Thermal overload
• Current imbalance
•
Jam
•
Stall
The Ground Fault Filter is useful for smaller-sized motors that trip unexpectedly
due to a controlled ground fault current that is significant relative to the current
draw of the electric motor. Ground Fault Filter (Parameter 131) allows you to
enable this filter.
Table 176 - Ground Fault Filter (Parameter 247
This filter only disables the effects of the ground fault current from the current-
based motor protection trip and warning functions. Current-based diagnostic
data is reported unfiltered when this feature is enabled.
Ground Fault Inhibit Time
Ground Fault Inhibit Time (Parameter 242) allows you to inhibit a ground fault
trip and warning from occurring during the motor starting sequence and is
adjustable from 0…250 seconds. The ground fault inhibit time begins when the
Current Present (bit 3) or Ground Fault Current Present (bit 4) is set in Device
Status 0 (Parameter 20).
Overload Reset Level (Parameter 248)
Default Value 0 = Disable
Minimum Value 0 = Disable
Maximum Value 1 = Enable
Parameter Type BOOL
Size (Bytes) 1
Scaling Factor 1
Units
Ground Fault Filter (Parameter 247)
Default Value 0 = Disable
Minimum Value 0 = Disable
Maximum Value 1 = Enable
Parameter Type BOOL
Size (Bytes) 1
Scaling Factor 1
Units