Parker MX80S Series Product Manual

Parker MX80S Series Product Manual Manual pdf 28 page image

MX80S Series Product Manual28Parker Hannifin CorporationEMN Automation - ParkerIrwin, PennsylvaniaChapter 4 - PerformanceAcceleration LimitsAcceleration of linear servo driven tables is typically limited by four (4) factors:• Linear BearingsThe linear bearings used in the MX80S have a continuous acceleration limit of 2 g’s. This meansthat the bearings are designed to take repetitive accelerations of 2 g’s and maintain the ratedbearing life.• Reduced Bearing LifeBearing loading due to high acceleration may reduce bearing life to an unacceptable applicationlimit. This is not usually a limiting factor unless loading is significantly cantilevered causing highmoment loads during accelerations. (Chapter 2, MX80S Series Technical Data to determine bear-ing load life for your application).• Available Motor ForceThis is the primary factor that reduces acceleration. This is simply the amount of motor force available to produce acceleration. The larger the inertial and or frictional load the lower the accelera-tions limit.• Settling TimeIn many applications reducing cycle time is a primary concern. To this end, the “settling” time (theamount of time needed after a move is completed for table and load oscillating to come within acceptable limits) become very important. In many cases where very small incrementing moves areexecuted, the settling time is greater than the actual move time. In these cases accelerations mayneed to be reduced thus reducing the settling time.Speed LimitsAcceleration of the MX80S table is limited by the maximum screw speed:Screw Lead Maximum Velocity1mm Leadscrew 20 mm/second2mm Leadscrew 40 mm/second10mm Leadscrew 200 mm/second2mm Ballscrew 100 mm/second