HEIDENHAIN MANUALplus 620 Technical Manual page 888

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Maximum values for parameter MP_iCtrlDiffFreqFF as a function of the PWM

PWM frequency

Adjustment of the current controller if increased current controller

factors are active over MP_iCtrlAddInfo:

For standard drives, it is usually not necessary to increase the current

controller bandwidth. In general, the increase is only useful if the drives are

connected directly without an interconnected gear.

feedforward or the increase of the current controller factors is

activated, you must keep in mind that the noise in the current increases when

the bandwidth is increased. You have to find a compromise between the

increase of the current controller bandwidth and

the development of noise in the drive.

To adjust the increased current controller factors, proceed as follows:

In the corresponding parameter set of the axis MP_iCtrlAddInfo, set bit

0 = 1 to activate the function.

Readjust the current controller with TNCopt (Bode diagram function; see

TNCopt User's Manual).

If you activate the PDT

MP_iCtrlDiffFreqFF parameter, it is not necessary to readjust the current

controller. The PDT

feedforward does not have a noticeable effect on the

current control loop but rather only on the superimposed speed control

loop. For axes with rigidly connected mechanics, you attain higher

controller factors in the speed control loop if the PDT

Maximum value for MP_iCtrlDiffFreqFF

feedforward by entering a value in the

HEIDENHAIN Technical Manual MANUALplus 620

feedforward is