690
Rotary Encoders
4
Rotary Encoders,
Absolute Rotary Encoders,
Standard
4
.1.1
Rotary Encoders,
Absolute Rotary Encoders
for hazardous areas
4
.1.3
Rotary Encoders,
Absolute Rotary Encoders
for safety applications
4
.1.2
Rotary Encoders,
Incremental Rotary Encoders
with pulse outputs
4
.2.1
Rotary Encoders,
Incremental Rotary Encoders,
Sine/Cosine
4
.2.2
Rotary Encoders,
Incremental Rotary Encoders
for hazardous areas
4
.2.4
Rotary Encoders,
Incremental Rotary Encoders
for safety applications
4
.2.3
Rotary Encoders,
Safety Speed Monitor
4
.5
Rotary Encoders,
Cable pulls
4
.3
Rotary Encoders,
Accessories
4
.4
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Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
Pepperl+Fuchs Group
fa-info@de.pepperl-fuchs.com
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fa-info@us.pepperl-fuchs.com
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Copyright Pepperl+Fuchs
2.4
Shaft load
The shaft of a rotary encoder is mounted free of play using two axially
tensioned ball bearings.
Due to the characteristics of the system, the permissible radial force (Fr)
is always greater than the axial force (Fa). The anticipated service life of
the bearing depends on three parameters: axial force, radial force, and
speed.
The diagram below illustrates the course of the anticipated service life
Lh10 in relation to the radial force (Fr).
Service life L h10
Radial force F r in N
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30
40 45 50
35
The correlation between service life and speed is illustrated by the fol-
lowing diagram.The maximum permissible speed is specified in the data
sheets for the rotary encoders. Note that this refers to the maximum per-
missible mechanical speed. The permissible electric speed depends on
the type of interface used.
Service life L h10
Speed n in min
-1
1.0
0.8
0.6
0.4
0.2
0.0
1000
0
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
3.
Mounting Instructions
3.1
Mounting rotary encoders
Mounting rotary encoders with solid shaft using a mounting bracket
Mounting rotary encoders with solid shaft using an eccentric clamping
element
Mounting rotary encoders with solid shaft using a mounting bell
3.2
Use of couplings
To prevent prohibited high loads on the bearing, a flexible coupling must
be used to connect the rotary encoder with solid shaft and the drive shaft.
Shaft offsets such as a radial, axial, or angular offset occur despite very
precise production and mounting of the drive shaft. This is often caused
by temperature effects. A rigidly mounted rotary encoder creates an
over-determined system with its clearance-free mount and the drive shaft
mount. The forces generated destroy the rotary encoder as a result of
increased axial and radial forces.
The higher the torsional rigidity of the coupling, the lower the torsional
error between the rotary encoder and drive.
The restoring forces of the coupling are directly related to the compensat-
ing movement of the coupling.These forces must not exceed the permis-
sible axial and radial forces.
See the data sheets for details on the permissible radial, axial, and an-
gular offset.
Mounting bracket 9203
RVI58
with
clamping
flange
Eccentric clamping ele-
ment 9312-3
RVI50
Spring disk coupling 9404
RVI58 with
servo flange
Eccentric clamping element
from mounting set 9311
Mounting bell 9300
Angular offset Δα
Δα
Radial offset Δr
Δr
Axial offset Δa
Δa
Rotary Encoders
