HEIDENHAIN TNC 306 Technical Manual - Manual (Page 138)

4-38
TNC 406/TNC 306
3 Serv
o pos
itioning of the NC-a
x
e
s
3
/97
Actual rpm Actual position
Motor Tacho
Nominal
current
Nominal
position
Trailing
error
(lag)
Nominal
rpm
Actual current
Actual position
Actual rpm
CNC Control Servo amplifier Machine
Block diagram of the position control loop, here cascade control.
Position
regulator
rpm
regulator
Current
regulator
Linear/
Rotary
encoder