Siemens SINUMERIK 840C - Manual (Page 528)

04.96 7 Drive Machine Data (SIMODRIVE Drive MD)
7.3.2 Drive MD (data description)
Threshold speed-dependent torque setpoint smoothing 1245
Default value Lower input value Upper input value Units
0.0 0.0 50 000.0 rev/min
Active
at once
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
upper
= n
threshold
+ n
hysteresis
n
lower
= n
threshold
– n
hysteresis
Graphic representation:
Low-pass
2nd filter
inactive 2nd filter
inactive
Filter type
(2nd current setpoint filter)
Speed n
t
n
threshold
+ n
hysteresis
n
threshold
- n
hysteresis
n
threshold
MD X246
MD X245
2nd filter inactive
Functionality: The switchover from "Feedthrough" to "Low-pass" takes place when the
absolute value of the actual speed exceeds the value n
upper
(In
act
I n
upper
) and vice versa
from "Low-pass" to "Feedthrough" when the absolute value of the actual speed drops below
the value n
lower
(In
act
I< n
lower
). If the value 0 is entered for the hysteresis, then the two
switchover speeds are identical.
Hysteresis speed-dependent torque setpoint smoothing 1246
Default value Lower input value Upper input value Units
50.0 0.0 1 000.0 rev/min
Active
at once
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 6FC5197- AA50 7–113
SINUMERIK 840C (IA)