FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

Adjust the output torque (current) of the motor4.8.3 Slip compensation (Pr. 245 to Pr. 247)V/FThe inverter output current may be used to assume motor slip to keep the motor speed constant.ParameterNumberName Initial Value Setting Range Description245 Rated slip 9999246247Slip compensation timeconstantConstant-power range slipcompensation selection0.5s 0.01 to 10s99990.01 to 50% Used to set the rated motor slip.0, 9999 No slip compensation09999Used to set the slip compensation responsetime. When the value is made smaller,response will be faster. However, as loadinertia is greater, a regenerative overvoltagefault (E.OV) is more liable to occur.Slip compensation is not made in theconstant power range (frequency rangeabove the frequency set in Pr. 3)Slip compensation is made in the constantpower range.⋅ Slip compensation is validated when the motor rated slip calculated by the following formula is set in Pr. 245. Slipcompensation is not made when Pr. 245 = "0" or "9999".Rated slip = Synchronous speed at base frequency - rated speed × 100[%]Synchronous speed at base frequencyREMARKSWhen performing slip compensation, the output frequency may become greater than the set frequency. Set the Pr. 1 Maximumfrequency value a little higher than the set frequency.♦ Parameters referred to ♦Pr. 1 Maximum frequency Refer to page 140Pr. 3 Base frequency Refer to page 142134