Siemens SINUMERIK 802S Start-Up page 88

Start-Up
4.7 Commissioning
Note
The error "Rotation monitoring" will also always occur if the stepper motor has been controlled
incorrectly even if the speed monitoring is not enabled. If deemed necessary, the user must
take appropriate measures to ensure that the stepper motor is shut down reliably.
Bent acceleration characteristic
A characteristic feature of stepper motor drives is the drop of the available torque in the upper
speed range (see Fig. 4-6).
M
Stepper moto
[Nm]
25
1
n : Reducing speed
red
n : Maximum speed
max
Fig. 4-6
The optimum capacity utilization of such characteristics with a simultaneous overload protec-
tion can be achieved using the velocity–dependent acceleration characteristic "Bent accelera-
tion characteristic".
Activation
In the AUTOMATIC mode, the bent acceleration characteristic is always active. The axis be-
havior is set via the parameterization of the characteristic.
For single motions in JOG mode, the bent acceleration characteristic can be enabled via MD
35240 MA_ACCEL_TYPE_DRIVE = 1 (default value=0).
Note
S
The bent acceleration characteristic can only be parameterized axis–related. The path traver-
sing behavior results from the caluclation using the axes involved.
S
MD 32420 JOG_AND_JERK_ENABLE=0
Prerequisite for action of the bent acceleration characteristic in JOG.
4-88
M
max
10
Typical motor characteristic for a stepper drive
n
4,000 r.p.m.
n
max
red
20 40 60 80 100
6FC5 597–2AA00–0BP2 (01.02)
n [%]
SINUMERIK 802S