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Transient operating periods
Additional motor connected downstream of the speed controller

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 Recommendations for use of the motor/speed controller combination Association with ALTIVAR speed controllers are designed to drive motors with a corresponding power rating different motors They can, however, be used with motors having different power ratings providing that certain precautions are observed Depending 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,   "Special Applications" (p 81) Motor power < speed controller rated power This combination is possible As compensation is not at the optimum level, this can lead to a reduction in continuous torque at low speed Adjust the U/f ratio if necessary (p 48) If motor power is < 0,5 controller rated power, correct adjustment of motor thermal protection is impossible (p 49) Cancel the internal protection and use standard external protection (overload relay or thermistors) Motor power > rated power of the controller Magnetizing current peaks limit this combination to the motor power immediately above the controller rating Again,  compensation  is  not  at  the  optimum  level,  and  the  U/f  ratio  should  be  adjusted  if necessary  (see  p  48)  The  motor  current  must  remain  lower  than,  or  equal  to  the  speed controller’s rated current Fit a three phase inductance between the speed controller and the motor, if necessary (p 36) Motors in parallel Speed controller selection Speed controller in > In1 + In2 + ...Inx Each motor should be protected by a thermal overload relay Compensation  is  not  at  the  optimum  level  Adjust  the  U/f  ratio  if  necessary  (p  48)  If  the motors have different power ratings, the ratio adjustment can only be a  compromise  If  the load 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  and the motor is recommended (p 36) (page 3-183)







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