Siemens SINUMERIK 840C Installation Instructions Manual page 528

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Input of speed value above which the torque setpoint smoothing function selected in machine

data "Type current setpoint filter" (MD 1201) with the 2nd filter (low-pass/band-stop) is

activated. The user can apply this speed-dependent torque setpoint smoothing function to

reduce the speed ripple at high speeds (main spindle drives).

If 0 is entered as the threshold value, then the filter remains active as a low-pass filter over the

entire speed range. When other values are entered, two switchover speeds are calculated

from machine data MD 1245 (Threshold speed-dependent torque setpoint smoothing) and MD

1246 (Hysteresis speed-dependent torque setpoint smoothing).

Graphic representation:

(2nd current setpoint filter)

Functionality: The switchover from "Feedthrough" to "Low-pass" takes place when the

absolute value of the actual speed exceeds the value n

from "Low-pass" to "Feedthrough" when the absolute value of the actual speed drops below

switchover speeds are identical.

Input of hysteresis for the cut-in speed set in machine data "Threshold speed-dependent

torque setpoint smoothing" (MD 1245).

SINUMERIK 840C (IA)

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Threshold speed-dependent torque setpoint smoothing

Default value

Lower input value

). If the value 0 is entered for the hysteresis, then the two

Hysteresis speed-dependent torque setpoint smoothing

Default value

Lower input value

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7 Drive Machine Data (SIMODRIVE Drive MD)

Upper input value

2nd filter inactive

Upper input value

6FC5197- AA50

7.3.2 Drive MD (data description)

) and vice versa

Simodrive 611-d