Functions
2.18 Kneeshaped acceleration characteristic curve
Basic logic functions: Acceleration (B2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
43
2.18
Kneeshaped acceleration characteristic curve
2.18.1
Detailed Description
2.18.1.1
Adaptation to the motor characteristic curve
Function
Various types of motor, particularly stepper motors, have a torque characteristic that is highly
dependent upon speed and shows a steep decrease in torque in the upper speed range. To
ensure optimum utilization of the motor characteristic curve, it is necessary to reduce the
acceleration once a certain speed is reached.
0UHG
0>1P@
Q>@
QPD[
QUHG
0PD[
Figure 2-5
Torque characteristic curve of a motor with torque characteristic that is highly dependent
upon speed
1:
Torque decrease zone
n
red
:
Speed above which reduced torque has to be assumed
n
max
: Maximum speed
M
max
: Max. torque
M
red
: Torque at n
max
(corresponds to creep acceleration)
Simulation of torque characteristic
For the purpose of simulating the torque characteristic of the motor characteristic curve, the
machine data:
MD35242 $MA_ACCEL_REDUCTION_TYPE =
characteristic
can be used to select various types of characteristic curve:
Summary of Contents for SINUMERIK 840D sl
Page 282: ...Index Basic logic functions Acceleration B2 64 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 388: ...Basic logic functions Travel to fixed stop F1 Function Manual 11 2006 6FC5397 0BP10 2BA0 52 ...
Page 962: ...Index Basic logic functions Emergency Stop N2 20 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1704: ...Constraints Basic logic functions Spindles S1 94 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1716: ...Index Basic logic functions Spindles S1 106 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1996: ...Index Basic logic functions Tool Offset W1 208 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2150: ...Table of contents Basic logic functions Appendix 4 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2184: ...Glossary Basic logic functions Appendix 38 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...