1– 646 HEIDENHAIN Service Manual iTNC 530
The control loop for
digital axes/
spindles
Machine tools normally function on the principle of cascade control.
Here the position control loop is prior to the speed and current control loops.
Benefits of cascade control:
Transparent structure of the individual control loops.
Disturbances can be compensated through the subsequent controllers.
This relieves the prior controller.
The respective outer control loop protects the inner control loop by limiting the command
variable.
The position, speed and current controllers are located in the iTNC 530.
The power module is driven by the CC 42x (B) through PWM signals.
PWM is the abbreviation for pulse-width modulation. The information content in this signal
depends on the relation of pulse duration to pulse-off duration.
Figure: Simplified illustration of a cascade control for the digital control loop
Figure: Nominal values, actual values and connected devices
To Next Page
Loading...
