HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 716)

11-2
TNC 407/TNC 415/TNC 425 1 Digital speed control 01.98
1 Digital speed control
A digital speed controller has been integrated into the TNC 425.
The benefits of this concept are:
•
High dynamic response
•
High Kv factor
•
Trailing errors are virtually "nil"
•
No drift
•
High geometrical accuracy with high traverse speeds
•
Traverse speeds up to 60 m/min
Cycle times: Contour interpolation 3 ms
Fine interpolation 0.6 ms
Block circuit diagram of TNC 425 with integral speed controller
TNC 425
–
+
–
+
–
+ Nominal
position
Machine slide
with linear
encoder
Feed motor with
rotary encoder
for rotor speed
and position
Machine
Actual current
Actual position
Actual speed
Servo Amplifier
Power stage
Digital speed
control
Position controller
Nominal
speed
(digital)
Nominal
current
Current
controller
Feed forward control
Acceleration
precontrol