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02.99
10.07
08.04
2.5
Gearbox selection
2.5.1
Gearboxes for SIMODRIVE POSMO A – 75 W
Modular gearbox,
For SIMODRIVE POSMO A –75 W, the following gearboxes can be
75 W motor
selected and used according to Table 2-4:
Table 2-4
System data, modular gearbox with planetary/worm gearboxes
Gearbox
Stage
Step–
type
type
num-
num-
down
down
ber
ber
ratio
ratio
i
Gearbox
Without
–
gearboxes
4.5
1
1
20.25
Planetary
Planetary
36
2
2
gearbox
gearbox
50
126.5625
3
3
162
Worm
Worm
24
1
1
2)3)
2)3)
gear
gear
75
1) The specified permissible gearbox torque may not be exceeded.
Gearboxes can be briefly loaded (1 – 2 s when starting) with higher torques up to a maximum of twice the
continuous torque without causing permanent damage (but this does have a negative impact on the
gearbox lifetime). The gearbox could be destroyed if this limit is exceeded.
The current limits of the positioning motor (P16 and P28) are preset in the factory to prevent destruction
by the torque produced by the motor.
2) Notice: If the worm gear has to be rotated due to the mechanical design, then the mounting screws must
be subsequently tightened to a torque of 2 Nm and secured using Loctite 274. No warranty is accepted
for damage caused by incorrect changes.
3) Torsional play < 1°
Notice
The factory default setting of the parameters P16 and P28 must not be
increased.
Forced rotation acceleration or delay from the outside is permitted only
within the scope of permissible torques.
Due to the run–up time of the gearbox, elevated currents may occur
when commissioning for the first time (grease distribution in the
gearbox).
Reader's note
Additional gearbox data
Dimension drawings of
motors and gearboxes
Gearbox–dependent parameters
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
Effi-
ciency
ciency
Permissible
S1
[Nm]
Gearbox
–
–
–
0.85
1.2
8
0.85
1.2
0.72
8
0.72
8
0.72
8
0.61
24
0.61
24
5
0.70
2
0.50
3.5
0.25
4
2 Installing and Connecting–Up
2.5 Gearbox selection
Torque
1)
Available
briefly
S1
S3
25 %
1 min
[Nm]
[Nm]
[Nm]
–
0.18
0.36
2.4
0.7
1.4
2.4
1.2
2.4
16
2.6
5.2
16
4.7
9.3
16
6.5
13.0
48
13.9
27.8
48
17.8
35.6
4
0.6
1.3
7
2.2
4.3
8
3.4
6.8
––> refer to Chapter 2.6.1
––> refer to Chapter C.1
––> refer to Chapter 5.6.3
2
Rated
speed
speed
n
(S1)
[rpm]
3300
733
413
163
92
66
26
20
660
138
44
2-61
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