Table 38. Current Phase Loss; Table 39. Undercurrent - Eaton Power Xpert C445 User Manual

Chapter 6—Motor Protection
Current Phase Loss
The Current Phase Loss protection monitors the current
unbalance of the motor and will trip the motor if the
unbalance exceeds the set threshold. The Current Phase
Loss protection is active when the motor is in the Running
state.
If a C445 relay is commissioned to monitor an AC motor, the
current must be fed on all three poles to prevent early
tripping.
Measurement Precondition Imax>50% of FLA, Imin<25% of
FLA, No V Phase Loss (or no voltage option)
Measurement Parameter Current unbalance percent

Table 38. Current Phase Loss

Fault
Code Protection Action
5 Current Phase Loss Fault Trip
Undercurrent
Undercurrent Trip Level protection monitors the three phase
currents and will fault if the measured current drops below
the set threshold.

Table 39. Undercurrent

Fault
Code Protection Action
14 Undercurrent Fault Trip
Fault Warning
132 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com
Fault Action
Modbus Units Min.
1016 % 60
Fault Action
Modbus Units Min.
1021 % FLA 10
1022 % FLA 10
Delay (Seconds)
Max. Default Min.
60 60 2
Delay (Seconds)
Max. Default Min.
90 50 1
90 50 0.2
Max. Default Modbus
2 2 1017
Max. Default Modbus
60 20 1023
5 2 1079