Telemecanique Altivar 56 manual - Northern Industrial

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Bulletin No. 50006-519-01BDecember 1996Chapter 3 — Start-UpAdjustment of Motor Overload• External thermal overload relays are required when more than one motor isconnected to the output or when the motor connected to the drive controller isless than half of the drive controller rating.• The thermal state of the drive controller is not automatically reset when poweris removed.ADJUSTMENT OFMOTOR OVERLOADAVAILABLE MOTORTORQUEContinuous DutyOvertorque Capability andSpeed RangeTo adjust Motor Overload, first select the type of protection in the 7.4 → FaultManagement menu. Two types of protection are available from the MotorOverload screen:• Self-Cooled Motor• No Thermal ProtectionThe drive controller is factory set for a self-cooled motor. Once the type ofprotection is selected, the Motor Overload current can be set in either the1 → Parameter Setting menu or in the 7.4 → Fault Management menu.Motor Overload can be adjusted from 0.45 to 1.15 times the nominal drivecontroller current, factory preset at 0.9 times the nominal drive controller current.Adjust Motor Overload value to nominal motor current. For more information onconfiguring the drive controller, refer to Chapter 5.For continuous duty reduced speed applications, motor torque derating may benecessary. This derating is linked to two causes:• Although the current waveform is similar to a sine wave, motor heating isslightly greater than when operating directly from the input line supply. Theresulting torque derating is approximately 5%. For 1.0 service factor motors,derating must be considered when choosing the continuous torque productioncapability of the motor at nameplate speed. For 1.15 service factor motors,derating of motor continuous torque capability is not required at nameplaterated speed.• For self-ventilating motors, ventilation produced by the internal shaft fandecreases as speed is reduced, therefore requiring derating of the maximumcontinuous torque capability of the motor. Generally, the required deratingoccurs at approximately 50% of nameplate motor speed. Since motor designsvary, consult the motor manufacturer for the required derating for a specificmotor.The driving overtorque capabilities of a given motor are determined by: the motorNEMA design category (Design B, Design D, etc.), no-load (magnetizing) currentof the motor at nameplate speed, maximum transient output current of the drivecontroller, and the applied V/Hz at reduced speed.Maximum transient overtorque capability is typically:• Normal control type:— ATV56U41N4 to D79N4 and ATV56U41M2 to D46M2: 110% over 50:1speed range• NOLD control type:— ATV56U41N4 to D79N4 and ATV56U41M2 to D46M2: 110% over 10:1speed rangeWith NOLD control, the motor overtorque capability begins to decrease below 50%of motor nameplate speed.© 1996 Square D All Rights Reserved37ηττπ://νιχοντρολσ.χοm
Chapter 3 — Start-UpBulletin No. 50006-519-01BAvailable Motor Torque December 1996Overspeed Operation(f ≥ 60 Hz)With an adjustable frequency drive controller, operation at speeds greater thanmotor nameplate speed may be possible. The following must be considered:CAUTIONMACHINERY OVERSPEEDSome motors and/or loads may not be suited for operation above nameplate motorspeed and frequency. Consult motor manufacturer before operating motor above ratedspeed.Failure to follow this instruction can result in injury or equipment damage.The drive controller is incapable of producing additional output voltage whenoperating above the nominal output frequency (60 Hz). When operating above thenominal output frequency, the available continuous motor torque will begin todecrease along with the motor maximum overtorque capability. Consult the motormanufacturer for continuous and overtorque torque capabilities of the particularmotor.Driving Torque ProductionEnvelopeFigure 22 illustrates a typical continuous torque and overtorque driving capabilityfor a typical NEMA Design B, 1.0 service factor motor with variable torque loads.For 1.15 service factor motors, the continuous torque rating is 1.0 times the motorrated torque value from 50 to 100% of motor nameplate rated speed.• Normal control type:— 100% torque typical at 50% of nominal frequency (over 2:1 speed range)— Torque decreases linearly to 50% at 0.1 Hz— Transient overtorque, typical ±10%:— ATV56U41N4 to D79N4 and ATV56U41M2 to D46M2: 110% torque for60 s.• NOLD control type:— 100% torque typical at 50% of nominal frequency (over 2:1 speed range)— Torque decreases linearly to 50% at 10% of nominal frequency— Transient overtorque, typical ±10%:— ATV56U41N4 to D79N4 and ATV56U41M2 to D46M2: 110% torque for60 s.T/Tn1.110.70.50.33211 Continuous useful torque2 Transient overtorque3 Transient overtorque during accelerationFn = nominal frequency00.1 FnfFn FmaxFigure 22: Typical Torque Curves38 © 1996 Square D All Rights Reservedηττπ://νιχοντρολσ.χοm
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Telemecanique Altivar 56 manual - Northern Industrial

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