Table 35. Overload; Table 36. Instantaneous Overcurrent - Eaton Power Xpert C445 User Manual

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 35. 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 36. Instantaneous Overcurrent

Fault
Code Protection Action
7 Instantaneous Fault Trip
Overcurrent
Fault Warning
Fault Trip Delay
Fault Action
Default
Status Units
Enabled amps
Disabled %
%
Fault Action Settings
Modbus Units
1012 % FLA
1013 % FLA
At powerup
Power Xpert C445 Global Motor Management Relay MN042003EN—October 2016 www.eaton.com
Note Min. Max.
C445MA2P2... 0.3 2.4
C445MA005... 1 5
C445MA032... 4 32
C445MA045... 6 45
C445MB072... 9 72
C445MC090... 11 90
C445MC136... 17 136
C445...ext ext 800
1 100
C445... 1 99
Min. Max. Default
50 400 400
50 400 400
Chapter 6—Motor Protection
Delay (Seconds)
Default Min. Max.
0.3 Class 5 Class 40
1
4
6
9
11
17
ext
90
75
Delay (Seconds)
Min. Max. Default
1 2000 2000
200 5000 2000
0 18000 0
Default
Class 5
Modbus
1015
1079
1014
139