Chapter 5—System Configuration and OperationPower Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com 77Star/Delta Operation ModeDescriptionThe Star/Delta starter control provides the logic to control aStar/Delta connected motor.C445 outputs:● Q1 output – star/delta motor starter LINE coil (NO)● Q2 output – star/delta motor starter DELTA coil (NO)● Q3 output – star/delta motor starter STAR coil (NO)A STOP command deactivates all contactor controlseffectively dropping out the motor.A START command activates the STAR contactor controlthen activates the LINE contactor control after the NetworkContactor Delay expires initiating a start in the STAR windingconfiguration. This parameter can be found in the OperationMode category in the Power Xpert inControl Software Tool.Switching to Delta: The control will switch to delta when thecontrol detects the motor is up to speed or when theMaximum Star Winding Time expires. The STAR contactorcontrol will first be deactivated. The DELTA contactor controlwill then be activated after the net delay time expires andcurrent readings = 0. The Maximum Star Winding Timeparameter can be found in the Operation Mode category inthe Power Xpert inControl Software Tool.The control will set MOTOR1 as the active motor parameterswhen starting in the star configuration and will set MOTOR2as the active motor parameters when running in the deltaconfiguration.The C445 will issue a control fault when:● Run command is active and phase voltage is present withno phase current detected after delay expires● Stop command active and current detected after delayexpiresNote: Even with the control fault disabled, the C445 willNOT transition to the delta winding until currentreadings in star decrease to zero.Figure 73. Timing Diagram for the Star/Delta OperationModeRecommended User Interface Options for theStar/Delta Operation ModeFigure 74. C445UM: Monitoring User InterfaceThe Monitoring User Interface can be used with anyoperation mode. If selected as a local control source, theUser Interface Start and Stop buttons are enabled in Star/Delta. Users may optionally disable local start or resetfunctionality if desired.C445UM may still be used in Star/Delta if the User Interfaceis not the local control source. Start, Stop and Auto buttonswill be disabled. If pressed, the screen will notify the userthat this functionality is not enabled. Control Status LEDsindicating running, stopped and Auto status will still function.LINESTARTiming DiagramDELTASettle TimeSettle TimeControl Fault DelayControl Fault DelayMax Star Time
