Siemens SINUMERIK 840C Installation Instructions

10 Axis and Spindle Installation 09.95
10.5.4 Curved acceleration characteristic (SW 4 and higher)
10.5.4 Curved acceleration characteristic (SW 4 and higher)
When induction motors are used (spindle operation), allowance must be made for their speed-
dependent acceleration capability in position-controlled operation:
Fig. 1 Torque characteristic of induction motor
a a a a a a a a a a a a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a a a a a a a a a a a a
TorqueM
a a a a a a a a a a a a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a a a a a a a a a a a a
Constant
torque
a a a a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a a a a
Breakdown limit
a a a a a a a a a a a a a a
a
a a a a a a a a a a a a
a
a
a a a a a a a a a a a a
a
a
a a a a a a a a a a a a
a
a a a a a a a a a a a a a a
M = const
a a a a a a a a a a a a a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a a a a a a a a a a a a a
Constant
power
a a a a a a a a a
a
a a a a a a a
a
a
a a a a a a a
a
a
a a a a a a a
a
a a a a a a a a a
M 1/n
a a a a a a a a a a a a a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a a a a a a a a a a a a a
M 1/(n*n)
a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a
Rated speed
a a a a a a a a a a a
a
a a a a a a a a a
a
a
a a a a a a a a a
a
a a a a a a a a a a a
Speed n
a a a
a
a
a
a
a
a
a a a
n
n
a a a a
a
a a
a
a
a a
a
a a a a
n
k
a a a a a a a
a
a a a a a
a
a
a a a a a
a
a a a a a a a
n
max
At speeds (n) above rated speed (n
n
), the drive acceleration capability decreases in relation to
the speed. Immediately above rated speed nn, there is a range of "constant power" in which
the torque (and thus also the acceleration capability) drop in proportion to 1/n. When speed n
increases further, there is a range ("breakdown limit") immediately above speed nk in which
the torque decreases in proportion to 1/(n*n).
The required parameters are selected and set in the MSD drive unit.
Fig. 2 Speed characteristic during acceleration (thick line)
a a a a a a a a
a
a a a a a a
a
a
a a a a a a
a
a a a a a a a a
Speed
a a a a a a a a a a
a
a a a a a a a a
a
a
a a a a a a a a
a
a a a a a a a a a a
Setpoint
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
The obtainable linear ramp-up time constants
increase out of proportion for higher speeds
a a a a
a
a a
a
a
a a
a
a a a a
T2
a a a a a a a
a
a a a a a
a
a
a a a a a
a
a a a a a a a
Time
a a a a
a
a a
a
a
a a
a
a a a a
n
n
a a a a
a
a a
a
a
a a
a
a a a a
n
k
a a a a a
a
a a a
a
a
a a a
a
a a a a a
T1
10–66 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)

Siemens SINUMERIK 840C Specifications

General

Brand	Siemens
Model	SINUMERIK 840C
Category	Control Unit
Language	English