3.3.4
Gear unit
3.3.4.1
Function
The device supports the use of several gear units within a drive chain. During configuration, the cor-
rect transmission ratio for each gear unit used must be specified. The transmission ratio is specified
using the gear ratio. The gear ratio consists of a numerator and denominator. The numerator indicates
the number of revolutions on the drive side of the gear unit and the denominator indicates the number
of resulting revolutions on the output side of the gear unit.
1 Motor shaft
2 Drive side
3 Gear unit
4 Output side
5 Axis
Fig. 38 Gear ratio (example)
Parameters of gear ratio groups 0, 1, 2
The device offers 3 gear ratio groups. For each gear ratio group, a gear ratio and a feed constant can
be set.
Using parameter P0.3251.x.0, it is possible to define which gear ratio group shall be used for the
respective encoder interface
è
Fig.37. The gear ratio and feed constant can therefore be set individu-
ally for each encoder interface.
The following parameters form gear ratio group 0:
ID Px.
Parameters
Description
Determines the numerator of the overall gear ratio (drive side).
Access
read/write
Update
reinitialization
1242
Total conversion
factor gear unit
numerator
Unit
−
Product configuration
173
Festo — CMMT-ST-SW — 2019-02
Summary of Contents for CMMT-ST-SW
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