Siemens SIMATIC FM 353 Manual page 164

Starting up
MD39: Start/stop frequency f
1. Enter J into J diagram (e.g. 3 kg@cm
Load
2. Determine f0 (e.g. 150 Hz) from intersection
with J curve
3. Shift base point of SS curve to f0
MD41: Maximum frequency f
1. Enter maximum frequency f
2. Enter MD41 = f
max
Read available motor torque M2 at f
No
Compare torque M2 with the idle time torque M0 of
Parameterize the speed
profile by way of simple
ramp
Enter
MD40 = MD41
MD43 = 0
MD45 = 0
Equate acceleration element for all
f − f : M = M
max b1 b2
MD45: Delay 2 a
v2
E.g. technological concerns may make a certain delay desirable, or friction torque
factors may provide a moment which deviates from the acceleration case. MD45 must
be either be calculated along the lines of the formula used to calculate MD43, or some
technologically desirable value must to be verified.
MD43: Acceleration 2 a
1. Determine acceleration moment M
2. Calculate delay:
3. 20% certainty: a = 0.8@a
b2
4. Enter rounded off value per MD 43
Acceleration element M
Yes
Enter
MD44 = 0
MD42: Acceleration 1 a
1. Calculate delay:
2. 20% certainty: a
3. Enter rounded off value per MD 42
Fig. 7-7 Evaluation of operating characteristic curves
7-16
ss
2
)
max
(e.g. 10,000 Hz) into the M diagram at maximum axis speed
max
max
the stepper motor: M2<< M0?
MD40: Frequency value for acceleration switchover f
1. Enter M1 = 2 @ M2 - M
2. Read f
3. Enter MD40 = f
No
b2
(e.g. 1.2 Nm)
b2
10,000 @ M
b2
a [Hz/s] =
J [kg@cm
total
(e.g. 109,134 Hz/s)
(e.g. 109,000 Hz/s)
determined (e.g. 2.4 Nm)
b1
Should values for acceleration and delay be
identical within the range f < f
MD44: Delay 1 a
v1
E.g. technological concerns may make a certain delay desirable, or friction torque
factors may provide a moment which deviates from the acceleration case. MD44 must
be either be calculated along the lines of the formula used to calculate MD42, or some
technologically desirable value must to be verified.
b1
a [Hz/s] =
= 0.8@a
b1
4. Enter M in M diagram (e.g. 0.6 Nm)
Load
5. Determine f1 (e.g. 130 Hz) from intersection
with SS curve
6. Enter MD39 = f = 0.8@f1 (e.g. 104 Hz)
ss
(e.g. 1.8 Nm)
yes (e.g. 1.8 << 5)
into M diagram (e.g. 3 Nm)
Load
(e.g. 3,000 Hz) from frequency scale
eg
eg
Should values for acceleration and delay be
identical within the range f > f
[Nm] @ MD13
(e.g. 136 418 Hz/s)
2
] @ 2 @π
No
?
eg
10,000 @ M [Nm] @ MD13
b1
2
J [kg@cm ] @2 @π
total
(e.g. 218,269 Hz/s)
(e.g. 218,000 Hz/s)
END
FM 353 Stepper Drive Positioning Module
Parameterize the speed
profile by way of bent
ramp
eg
Yes
?
eg
Enter
MD45 = 0
J = J + J
total Motor Load
2
J = 7 kg @cm
total
(e.g. 272 837 Hz/s)
6ES7 353-1AH01-8BG0