Chapter 6—Motor Protection144 Power Xpert C445 Global Motor Management Relay MN042003EN—October 2016 www.eaton.comVoltage UnbalanceVoltage Unbalance is estimated using the following equation.The Voltage Unbalance protection monitors the voltageunbalance percentage of the supply and will trip the motor ifthe voltage exceeds the set threshold. The VoltageUnbalance protection is active when the motor is in theenergized state. When the Voltage unbalance Start Inhibitprotection is enabled, the Undervoltage protection willprevent a start into an unbalanced condition as determinedby the Unbalance Start Inhibit Level.Table 45. Voltage UnbalanceVoltage Phase LossThe Voltage Phase Loss protection monitors the phasevoltage of the motor and will trip the motor if the voltage fallsbelow 70% of the nominal mains voltage.Table 46. Voltage Phase LossFaultCode ModbusFault Action Delay (Seconds)Protection Action Units Min. Max. Default Min. Max. Default Modbus11 Voltage Unbalance Fault Trip 1043 % 1 20 6 1 60 20 1045Fault Warning 1044 % 1 20 6 0.2 5 2 1079FaultCode ModbusFault Action Delay (Seconds)Protection Action Units Min. Max. Default Min. Max. Default Modbus11 Voltage Phase Loss Fault Trip 1041 % 70 70 70 2 2 2 1042
