322 Rockwell Automation Publication 193-UM015E-EN-P - October 2015
Chapter 6 Protective Trip and Warning Functions
Ground Fault Type
The E300 relay has two options available to measure ground fault current.
Ground Fault Type (Parameter 241) allows you to select the internal option or
the external option with the appropriate measurement range.
Table 239 - Ground Fault Type (Parameter 241)
Ground Fault Maximum 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.
When enabled, Ground Fault Maximum Inhibit (Parameter 248), inhibits a
ground fault trip from occurring when the ground fault current exceeds the
maximum range of the core-balance sensor (approximately 6.5 A).
ATTENTION: The E300 relay is not a ground fault circuit interrupt or for personal
protection as defined in Article 100 of the NEC.
ATTENTION: The E300 relay is not intended to signal a disconnecting means to
open the faulted current. A disconnecting device must be capable of
interrupting the maximum available fault current of the system on which it is
used.
Ground Fault Type (Parameter 241)
Default Value 1 = Internal 0.500…5.000 A
Range
1 = Internal 0.500…5.000 A
2 = External 0.020…0.100 A
3 = External 0.100…0.500 A
4 = External 0.200…1.000 A
5 = External 1.000…5.000 A
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units
To Next Page
Loading...
Need help?
General
