User Manual

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 137
Monitoring Parameters Chapter 6
Ground Fault Current
Reporting
Current Range
The following chart illustrates the minimum and maximum reporting ground
fault current values for a given ground fault current range.
➊ The E3 Plus Overload Relay will report 0 A if the ground fault current is below 50% of the minimum ground fault
current setting for a given range.
➋ The E3 Plus Overload Relay is capable of reporting values greater than the maximum values shown, but the
accuracy of the value is compromised.
➌ The accuracy specified is only applicable to non-distorted sinusoidal currents.
➍ 20…100 mA for resistive loads only. For motor loads, consult your local Rockwell Automation sales office or
Allen-Bradley distributor.
Frequency Range
The E3 Plus Overload Relay is capable of sensing variable frequency ground fault
currents ranging from 20…250 Hz.
Exception: Any E3 Plus Overload Relay using an external ground fault sensor is
limited to 50/60 Hz detection.
Diagnostic Parameters
The E3 Overload relay provides a number of motor diagnostic parameters to
assist maintenance personnel with information to minimize unplanned down
time. The relay also provides a number of preventative maintenance diagnostics
to maximize the life of an electric motor.
Table 3: Ground Fault Current Reporting Summary
Ground Fault
Current Range
Minimum
Reporting
Current ➊➌
Maximum
Reporting
Current ➋➌
E3 Plus Cat. No. /Series
20…100 mA➍ 10 mA 180 mA 193/592-EC3 and -EC5 — Series C
and later
100…500 mA 50 mA 900 mA 193/592-EC3 and -EC5 — Series C
and later
200 mA…1.0 A 100 mA 1.80 A 193/592-EC3 and -EC5 — Series C
and later
1.0…5.0 A 500 mA 9.00 A 193/592-EC2 and -EC5 — Series A
and later