Telemecanique Altivar 56 manual - Northern Industrial

Bulletin No. 50006-519-01BDecember 1996Chapter 3 — Start-UpMotor ConsiderationsMOTORCONSIDERATIONSMotor InsulationMany factors must be considered when controlling a motor with a drive controller.The following sections describe several drive controller characteristics as theyrelate to motor protection and performance.ALTIVAR 56 drive controllers use pulse width modulation. Verify that the motorinsulation is designed for this modulation method.Motors in ParallelDriveControllerIn1In2InxM1M2MxDrive controller selection:• Drive controller In ≥ In1 + In2 + … Inx• Drive controller Pn ≥ Pn1 + Pn2 + … Pnx• Protect each motor with a thermaloverload relayIn: rated current Pn: rated powerFigure 23: Motors in ParallelTo operate motors in parallel, use the keypad display to set the Control Type to“Normal.” For information on adjusting and disabling parameters, see Chapter 5.If three or more motors are to be installed in parallel, consult factory.Output Contactor BetweenMotor and Drive ControllerAdditional Motor ConnectedDownstream of the DriveControllerWhen using an output contactor between the drive controller and motor, use of theBypass application function is recommended. In order to set the motor parametersfor optimum performance, the motor must be directly connected to the output ofthe drive controller at least one time during drive controller power-up. For moreinformation, refer to Chapter 5.When connecting an additional motor, comply with the recommendation for“Motors in Parallel” on page 39.DriveControllerOL1M1KM1OL2M2Figure 24: Connecting an Additional MotorIf the motor is to be connected to the drive controller while the drive controller isrunning, the sum of the running motor current(s) plus the expected startingcurrent of the switched motor must not exceed 90% of the drive controller’stransient output current rating.Table 18: Operating Non-Standard MotorsDescription Overload ControlTypeMotors in parallel Disable [1] NormalAdditional motor Disable [1] NormalSynchronous permanent magnetSynchronous wound fieldSynchronous reluctanceNot RecommendedNot RecommendedNot Recommended[1] An external thermal overload relay is required if thedrive controller protection is disabled.© 1996 Square D All Rights Reserved39ηττπ://νιχοντρολσ.χοm