Eaton Power Xpert C445 - CHAPTER 8-C445 UM MONITORING USER INTERFACE; C445 UM Overview

Chapter 6—Motor Protection
132 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com
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
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 Modbus
Fault Action Delay (Seconds)
Protection Action Units Min. Max. Default Min. Max. Default Modbus
5 Current Phase Loss Fault Trip 1016 % 60 60 60 2 2 2 1017
Fault
Code Modbus
Fault Action Delay (Seconds)
Protection Action Units Min. Max. Default Min. Max. Default Modbus
14 Undercurrent Fault Trip 1021 % FLA 10 90 50 1 60 20 1023
Fault Warning 1022 % FLA 10 90 50 0.2 5 2 1079