HEIDENHAIN TNC 306 Technical Manual - Manual (Page 137)

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TNC 406/TNC 306 3 Servo positioning of the NC-axes 4-37
3 Servo positioning of the NC-axes
This section describes all the control functions which are important for the control and monitoring of
the NC-axes.
Further parameters for the NC-axes can be found under "Machine axes."
The control of the gap is described under "Gap control."
3.1 The position control loop of an NC-machine
In NC machines the servo control is normally implemented as a cascade control (see following block
diagram).
The motor speed control and the current control (both in the drive amplifier) are integrated into the
servo position control (NC-control). The servo controlled system consists of the motor and machine
slide.