Rockwell Automation 8510 AC Spindle Drive System Programming Manual - Manual (Page 28)

Programming
Chapter 2
2-25
Speed Cal
The Speed Cal parameter allows exact matching of the speed command
to the actual motor speed in order to precisely set position loop gain.
When the velocity command from a closed position loop move
commanded by the CNC is input to the drive, the Scroll keys can be
used to adjust the motor speed until the exact following error value
required in the CNC is achieved. Press the Select key to store the
setting.
This could be considered a fine tuning of the Max Cmnd Spd parameter.
As the appropriate Scroll key is pressed, a multiplier factor for the Max
Cmnd Spd parameter is incremented in 0.04% steps. There is a time
delay of approximately one second after the multiplier is changed until
it can be observed in the system operation. During this operation, the
display is operating as a digital speed meter showing current motor
speed. Reprogramming the Max Cmnd Spd parameter will reset this
multiplier to zero.
Data Range: RPM 00000 to 30000
Default Value 0.00 %
LO SPD RANGE
This menu selects the various setup and tuning parameters that are used
when the Spindle/Servo Mode Select input is On and the Servo Input
Scaling Low/High input is Off.
Max Cmnd Spd
Defines the maximum motor speed that will correspond to the
maximum input command. The maximum motor speed can be
programmed to any level required by the application (but less than the
maximum allowable speed for the motor/drive combination) and
achieve full scale speed command resolution at that speed. Typically
this parameter would be used to obtain maximum resolution for C axis
contouring mode and would be set to a very low speed.
Data Range: RPM 00000 to 30000
Default Value 00030
The tuning parameters in the 8510 drive are based on the “per unit” system.
For this drive the base quantities are defined as follows:
1 p.u. Torque = Peak Motor Torque
1 p.u. Velocity or Velocity Error = Motor Base Speed
1 p.u. Inertia = Time to accelerate to 1 p.u. Velocity with 1 p.u. Torque
Refer to Chapter 3 for a detailed description of drive tuning and the use of
the “per unit” system in determining optimum drive tuning parameters.