Siemens SIMATIC FM 353, Manual

Page: 269 / 361

Description of Functions
9-69
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
9.7.1 Frequency generation
Function parameters
The following table shows you which parameters to use in matching frequency
generation to the selected stepper drive.
MD Designation Value/Meaning Unit
39 Start/Stop frequency (f
ss
) 10 − 10,000
[
Hz
]
40 Frequency value for accelera-
tion switchover (f
eg
)
1)
500 − 75,000
Minimum value: MD39
Maximum value: MD41
[
Hz
]
41 Maximum frequency (f
max
) 500 − 200,000
[
Hz
]
42 Acceleration 1 (a
b1
)
1)
10 − 10,000,000
[
Hz/sec
]
43 Acceleration 2 (a
b2
)
1)
10 − MD42, 0 as with MD42
[
Hz/sec
]
44 Deceleration 1 (a
v1
)
1)
10 − 10,000,000, 0 = as with
MD42
[
Hz/sec
]
45 Deceleration 2 (a
v2
)
1)
10 − MD44, 0 = as with
MD43
[
Hz/sec
]
46 Minimum idle time between
two positioning cycles (t
st
)
1 − 10,000
[
ms
]
47 Minimum traversing time at
constant frequency (t
vk
)
1 − 10,000
[
ms
]
1) see Section 5.3.1, Dependencies
Frequency profile
In controlling speed, special importance is attached to the drive-specific require-
ments regarding the shape of the frequency/time function. Based on this, a discon-
tinuous traversing movement is initiated or stopped below the Start/Stop frequency.
For higher traversing velocities, a ramp-shaped control cycle, which builds on the
Start/Stop frequency, takes place within two velocity ranges with acceleration val-
ues of different parameterization capability .
The following illustrations provide you with examples of frequency profiles for se-
lected traversing movements.
Maximum speed frequency profile
t
f
f
max
f
eg
f
ss
a
v2
a
b2
a
v1
a
b1
Fig. 9-7 Maximum speed frequency profile