8 Operation8.7.5 Multiturn Limit Setting8-328.7.5 Multiturn Limit SettingThe multiturn limit setting is used in position control applications for a turntable or other rotating device.For example, consider a machine that moves the turntable in the following diagram in only one direction.Because the turntable moves in only one direction, the upper limit for revolutions that can be counted by anabsolute encoder will eventually be exceeded. The multiturn limit setting is used in cases like this to preventfractions from being produced by the integral ratio of the motor revolutions and turntable revolutions.For a machine with a gear ratio of n:m, as shown above, the value of m minus 1 will be the setting for the mul-titurn limit setting (Pn205).Multiturn limit setting (Pn205) = m-1The case in which the relationship between the turntable revolutions and motor revolutions is m = 100 and n =3 is shown in the following graph.Pn205 is set to 99.Pn205 = 100 − 1 = 99Note: This parameter is valid when the absolute encoder is used.The range of the data will vary when this parameter is set to anything other than the factory setting.1. When the motor rotates in the reverse direction with the rotational data at 0, the rotational data will changeto the setting of Pn205.2. When the motor rotates in the forward direction with the rotational data at the Pn205 setting, the rotationaldata will change to 0. Set the value, the desired rotational amount -1, to Pn205.Pn205(20C0h)Multiturn Limit Setting ClassificationSetting Range Setting Unit Factory Setting When Enabled0 to 65535 1 Rev 65535 After restart SetupTurntableGearServomotor0123456789Motor rotations100 200 300 010050Rotational dataTable rotationsSet value of Pn205 = 99TablerotationsRotationalserial dataSpeed Position
