66 Program featuresIR compensation for a scalar controlled driveIR compensation is active 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 Direct Torque Control (DTC), no IRcompensation is possible or needed. User-definable load curveThe drive output can be limited by defining a user-definable load curve. In practice,the user load curve consists of an overload and an underload curve, even thoughneither is compulsory. Each curve is formed by five points that represent outputcurrent or torque as a function of frequency.An alarm or fault can be set up to occur when the curve is exceeded. The upperboundary (overload curve) can also be used as a torque or current limiter.SettingsParameter group 34 User load curve (page 204).f (Hz)Motor VoltageNo compensationIR Compensationf (Hz )Load (%)Par. 34.03 Par. 34.04 Par. 34.05 Par. 34.06 Par. 34.07Allowed operating rangeOverload areaUnderload area34.1334.1434.15 34.16 34.1734.08 34.0934.1034.11 34.12
