TM 5-3895-374-24-1Recommendations for useof the motor/speed controller combinationAssociation withALTIVAR speed controllers are designed to drive motors with a corresponding power ratingdifferent motorsThey can, however, be used with motors having different power ratings providing thatcertain precautions are observedDepending on the motor characteristics, and the performance necessary for the application,the use of a special software is recommended See part 2 of this document, "SpecialApplications" (p 81)Motor power < speed controller rated powerThis combination is possibleAs compensation is not at the optimum level, this can lead to a reduction in continuoustorque at low speed Adjust the U/f ratio ifnecessary (p 48)If motor power is < 0,5 controller rated power, correct adjustment of motor thermalprotection is impossible (p 49)Cancel the internal protection and use standard external protection (overload relay orthermistors)Motor power > rated power of the controllerMagnetizing current peaks limit this combination to the motor power immediately above thecontroller ratingAgain, compensation is not at the optimum level, and the U/f ratio should be adjusted ifnecessary (see p 48) The motor current must remain lower than, or equal to the speedcontroller’s rated current Fit a three phase inductance between the speed controller and themotor, if necessary (p 36)Motors in parallelSpeed controller selectionSpeed controller in > In1 + In2 + ...InxEach motor should be protected by a thermaloverload relayCompensation is not at the optimum level Adjust the U/f ratio if necessary (p 48) If themotors have different power ratings, the ratio adjustment can only be a compromise If theload is to be shared between the motors, override the slip compensation (p 45)If there are 2 3 motors, fitting a three phase inductance between the speed controller andthe motor is recommended (p 36)(page 3-183)
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