Chapter 6—Motor Protection
Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com 133
Ground Fault
The Residual Ground Fault protection monitors the ground
current of the motor and will trip the motor if the ground
current exceeds the set threshold. The Ground Fault
protection is always active.
Table 40. Ground Fault
Note
1
ABC wiring recommended.
Note: Refer to Chapter 10 for information concerning the
External Ground Fault module and the Pulse Detect
Ground Fault feature.
Supply Protection
The C445 monitors the supply voltage to the motor for the
faults described below. These protections are only available
if the C445 Measurement Module has the voltage option.
Users can easily customize protection settings in the
protection menu of the Monitoring User Interface or of
Power Xpert inControl.
To enable/disable individual trip and warning protections,
navigate to Protections R General R Trip Enable / Warning
Enable.
To customize protection levels and delays for each protection
feature, navigate to the category of that protection in
Protections R Current / Voltage / Power / Frequency /
Ground Fault
When the Supply fault is enabled in Trip mode, the C445 will
trip if a Voltage fault is detected when the motor is running.
In this mode, a Start will be inhibited if the fault condition is
present. Starts will be allowed as soon as the fault condition
is cleared.
Users may also optionally inhibit starting based on presence
of a voltage fault. To inhibit starting based on voltage faults,
enable “Inhibit Start on Voltage Fault” in the Protections R
General menu.
Fault
Code Modbus
Fault Action Delay (Seconds)
Protection Action Units Frame Min. Max. Default Min. Max. Default Modbus
4 Ground Fault
(earth)
Fault Trip 1060 amps C445MA2P4… 0.12 2.4 1 1 60 5 1063
C445MA005… 0.25 5 3 1 60 5 1063
C445MA032… 1
1
9.6 3 1 60 5 1063
C445MA045… 1
1
13.5 3 1 60 5 1063
C445MB072… 3
1
21.6 3 1 60 5 1063
C445MC090… 3 27 3 1 60 5 1063
C445MC136… 34 40.8 34 1 60 5 1063
C445M…EXT 30% of CT
Primary
50% of CT
Primary
50% of CT
Primary
1 60 5 1063
Fault Warning 1061 2 1079
Fault Trip Delay At powerup 0 5 0 1062
Use Fault Trip
Inhibit
1064 Disable Enable Disable
Fault Trip Inhibit -
Run
1065 % 25 100 50 0 0 0
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