Table 33. Overload; Table 34. Instantaneous Overcurrent - Eaton Power Xpert C445 User Manual

Chapter 6—Motor Protection
Motor Thermal Overload
The Overload function models the thermal characteristics of
a motor and generates a Fault Trip event that de-energizes
the motor before motor damage will occur. This is intended
to protect the motor and power wiring from excessive
current. Trip curves are defined by applicable agency
standards. The trip class for any particular Overload class is
user adjustable.

Table 33. Overload

Fault
Code Protection Action
19 Thermal Overload Fault Trip
Fault Warning
Overload Reset
Threshold
Instantaneous Overcurrent
The Instantaneous Overcurrent protection monitors the
maximum phase current of the motor and will trip the motor
if the current exceeds the set threshold. The Instantaneous
Current protection is active when the motor is energized but
does have a separate Start delay to account for high starting
currents that are characteristic of high efficiency induction
motors.

Table 34. Instantaneous Overcurrent

Fault
Code Protection Action
7 Instantaneous Fault Trip
Overcurrent
Fault Warning
Fault Trip Delay
130 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com
Fault Action
Default
Status Units Note
Enabled amps C445MA2P2... 0.3
C445MA005... 1
C445MA032... 4
C445MA045... 6
C445MB072... 9
C445MC090... 11
C445MC136... 17
C445...ext
Disabled %
% C445...
Fault Action Settings
Modbus Units Min.
1012 % FLA 50
1013 % FLA 50
At powerup
Min. Max. Default
2.4 0.3
5 1
32 4
45 6
72 9
90 11
136 17
ext 800 ext
1 100 90
1 99 75
Delay (Seconds)
Max. Default Min.
400 400 1
400 400 200
0
Delay (Seconds)
Min. Max. Default
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Class 5 Class 40 Class 5
Max. Default Modbus
2000 2000 1015
5000 2000 1079
18000 0 1014