Program features 69 Scalar motor controlScalar motor control is the default motor control method. It is suitable for applicationswhich do not require the control accuracy available in vector control. In scalar control,you control the drive output frequency reference, and you do not need to do anymotor identification run at the first start.It is recommended to activate scalar motor control mode in the following specialsituations:• In multimotor drives: 1) if the load is not equally shared between the motors, 2) ifthe motors are of different sizes, or 3) if the motors are going to be changed aftermotor identification (ID run)• If the nominal current of the motor is less than 1/6 of the nominal output current ofthe drive• If the drive is used without a motor connected (for example, for test purposes)• If the drive runs a medium-voltage motor through a step-up transformer.In scalar control, some features are not available.See also section Operating modes and motor control modes on page 52.IR compensation for scalar motor controlIR compensation (also known asvoltage boost) is available only whenthe motor control mode is scalar. WhenIR compensation is activated, the drivegives an extra voltage boost to themotor at low speeds. IR compensationis useful in applications that require ahigh break-away torque.In vector control, no IR compensation ispossible or needed as it is appliedautomatically.ParametersParameters: group 28 Frequency reference chain, 97.13 IR compensation and 99.04Motor control mode. User load curveThe User load curve provides a supervisory function that monitors an input signal asa function of frequency or speed, and load. It shows the status of the monitored signaland can give a warning or fault based on the violation of a user defined profile.Motor voltagef (Hz)IR compensationNo compensation
