Residual Ground Fault - Eaton Power Xpert C445 Safety Manual

Residual Ground Fault

Residual Ground Fault
The Residual Ground Fault protection monitors the ground
current of the motor and will trip the motor if the ground cur-
rent exceeds the set threshold. The Ground Fault protection is
always active.
Protections —> Ground Fault —> Residual GF
Ground Fault
Fault
Code Protection Action
4 Ground Fault Fautl Trip
(earth)
Fault
Warning
Fault Trip
Delay
Use Fault
Trip Inhibit
Fault Trip
Inhibit Run
Ú
If the C445 relay is commissioned to monitor an
AC motor, the current must be fed on all three
poles in order to prevent early tripping. DC motors
cannot be monitored.
WARNING
IMPROPER FAULT DETECTION
Residual Ground fault will not protect people from harm
caused by ground current .
Ground fault thresholds must be set to protect the
motor and related equipment .
Ground fault settings must conform to national and
local safety regulations and codes .
Failure to follow these instructions can result in death
or serious injury .
14 Safety Manual MN042004EN March 2017 www.eaton.com
Fault
Modbus Action Units Frame
1060 amps C445MA2P4...
C445MA005...
C445MA032...
C445MA045...
C445MB072...
C445MC090...
C445MC136...
C445M...EXT
1061
1064
1065 %
Delay (Seconds)
Min. Max. Default Min.
0.12 2.4 1 1
0.25 5 3
1 9.6 3
1 13.5 3
3 21.6 3
3 27 3
34 40.8 34
30% 50% 50%
of CT of CT of CT
Primary Primary Primary
At
powerup 0
Disable Enable Disable
25 100 50 0
Max. Default Modbus
60 5 1063
2 1079
5 0 1062
0 0