Chapter 6—Motor ProtectionPower Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com 131JamThe C445 will monitor the average RMS value of the threephase currents. If the RMS value rises above the thresholdfor the required length of time a Fault is detected and theunit will trip. The Jam settings will only be active during theMotor Running state.Table 35. JamStallThe Stall protection monitors the average phase current as apercentage of FLA of the motor and will trip the motor if thecurrent exceeds the set threshold. The Stall protection is onlyactive as the motor transitions from the Starting to Runningstates.Table 36. Stall 1Note1 Only active during transition from start cycle to run cycle.Current UnbalanceCurrent unbalance is defined using the following equation:The C445 will monitor the Current Unbalance. If the valueexceeds the threshold for the required length of time a faultis detected and the unit will trip. The Current Unbalanceprotection is enabled only in the Motor Running state.Modifying the TRIP ENABLE/DISABLE register will enable ordisable the Current Unbalance protection feature.Table 37. Current UnbalanceFaultCode ModbusFault Action Delay (Seconds)Protection Action Units Min. Max. Default Min. Max. Default Modbus8 Jam Fault Trip 1008 % FLA 50 400 400 1 60 5 1010Fault Warning 1009 % FLA 50 400 400 0.2 5 2 1079FaultCode ModbusFault Action Delay (Seconds)Protection Action Units Min. Max. Default Min. Max. Default Modbus20 Stall Fault Trip 1007 % FLA 50 400 200 0 0 0FaultCode ModbusFault Action Delay (Seconds)Protection Action Units Min. Max. Default Min. Max. Default Modbus6 Current Unbalance Fault Trip 1018 % 1 60 15 1 60 15 1020Fault Warning 1019 % 1 60 15 0.2 5 2 1079
