Siemens SINUMERIK 840C Installation Instructions Manual page 528

04.96
1245
Threshold speed-dependent torque setpoint smoothing
Default value
0.0
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).
n = n +
upper threshold
n = n –
lower threshold
Graphic representation:
Filter type
(2nd current setpoint filter)
Speed n
n + n
threshold hysteresis
n
threshold
n - n
threshold hysteresis
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
the value n (In I< n
lower act lower
switchover speeds are identical.
1246
Hysteresis speed-dependent torque setpoint smoothing
Default value
50.0
Input of hysteresis for the cut-in speed set in machine data "Threshold speed-dependent
torque setpoint smoothing" (MD 1245).
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
Lower input value Upper input value
0.0
n
hysteresis
n
hysteresis
2nd filter
Low-pass
inactive
2nd filter inactive
). If the value 0 is entered for the hysteresis, then the two
Lower input value Upper input value
0.0
6FC5197- AA50
7 Drive Machine Data (SIMODRIVE Drive MD)
7.3.2 Drive MD (data description)
50 000.0 rev/min
2nd filter
inactive
MD X246
(In I n ) and vice versa
upper act upper
1 000.0 rev/min
Active
at once
Units
MD X245
t
Active
at once
Units
7–113