Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 91)

Rockwell Automation Publication 193-UM015B-EN-P - June 2014 91
Protective Trip and Warning Functions Chapter 5
Table 71 - Overload Reset Level (Parameter 248)
Ground Fault Filter
An E300 Electronic Overload Relay has the capability to filter ground fault
currents for High Resistance Grounded (HRG) systems from its current-based
protection trip and warning functions which includes:
• 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 the user
to enable this filter.
Table 72 - 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 will be reported unfiltered when this feature is enabled.
Ground Fault Inhibit Time
Ground Fault Inhibit Time (Parameter 242) allows the user 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