1– 652 HEIDENHAIN Service Manual iTNC 530
The speed
controller
6, 10 or 12 digital speed controllers for the axes and spindles are integrated in the iTNC 530:
The actual speed values are measured directly at the motors with HEIDENHAIN rotary encoders.
The position controller provides the nominal speed value. The speed controller is driven by the
difference between nominal and actual speed values. It provides the nominal current value as
output.
Figure: Simplified illustration of the speed controller
The current
controller
6, 10 or 12 digital current controllers for the axes and spindles are integrated in the iTNC 530:
The nominal values for magnetizing current I
dnom
and torque current I
qnom
are divided into the
PWM signals U
1
, U
2
and U
3
through a PI controller and vector rotator VD+, and are transferred
to the power module through X51 to X60.
Principle of the generation of PWM signals --> See “PWM Signals” on page 1 – 654.
The actual current values I
1act
and I
2act
are determined by the power module and are transferred
to vector rotator VD– through X51 to X60. The vector rotator determines the actual values of
magnetizing current I
dist
and torque current I
qnom
.
Figure: Simplified illustration of the current controller
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