SIEMENS
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Siemens D 21.4 · 2017
Motion Control Encoder measuring systems
Built-on optoelectronic rotary encoders
Introduction
11
■
Overview
(continued)
Incremental and absolute encoders with mounting accessories
Motion control encoders are optoelectronic built-on encoders
that detect the traversing distances, angles of rotation, speeds
or positions of machine axes. Motion control encoders are direct
measuring systems that are built-on to shafts, axes or motors.
They can be used in conjunction with numerical and program-
mable logic controllers, drives and position displays. Motion
control encoders are system-tested, certified components that
have been harmonized for use with the following systems:
•
SINUMERIK CNC controls
•
SIMOTION Motion Control Systems
•
SIMATIC programmable logic controllers
•
SINAMICS drive systems
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Application
Motion control encoders are used with machine tools and pro-
duction machines as additional external measuring systems.
They are available as incremental or absolute encoders.
Incremental encoders
In the case of incremental encoders, the machine must travel to a
reference point after each power-off state, as the position is not
usually stored in the controller. Movements of the machine while
the power is off are not recorded.
Incremental encoders are suitable for use in simple machine
concepts with mostly small dimensions.
Absolute encoders
Absolute encoders, on the other hand, also record movements
while the power is off and return the actual position after power
on. Travel to a reference point is not necessary.
Absolute encoders are suitable for complex machines or
machines with large dimensions.
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Design
All motion control encoders are available in Synchro flange and
clamp flange versions. The absolute encoders are also available
with a hollow shaft and torque arm.
The motion control encoders are driven via a plug-in coupling or
spring disk coupling. Alternatively, pulleys can also be used.
The motor control encoder supply voltage is 5 V DC or alterna-
tively 10 V to 30 V DC. The 10 V to 30 V DC version supports
longer cable lengths. Most control systems supply the voltage
directly at the measuring circuit connector. With SINAMICS, the
measuring systems are provided with power via the Sensor
Modules.
For motion control encoders with cables, the cable length in-
cluding the connector is 1 m (3.28 ft).
The following bending radii must be observed for the cable to
the built-on encoder:
•
One-time bending:
≥
20 mm (0.79 in)
•
Continuous bending:
≥
75 mm (2.95 in)
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Additional information
Power supply
The measuring systems fulfill the requirements of IEC 61010-1
only if power is supplied from a secondary circuit with limited
energy acc. to IEC 61010-1
3rd Ed.
, Section 9.4, or with limited
power source acc. to
IEC 60950-1
2nd Ed.
, Section 2.5, or from a Class 2 secondary
circuit in accordance with UL 1310.
The corresponding sections of DIN EN 61010-1, EN 61010-1,
UL 61010-1 and CAN/CSA-C22.2 No. 61010-1 can be used
instead of IEC 61010-1
3rd Ed.
, Section 9.4, and the correspond-
ing sections of DIN EN 60950-1, EN 60950-1, UL 60950-1 and
CAN/CSA-C22.2 No. 60950-1 can be used instead of
IEC 60950-1
2nd Ed.
, Section 2.5.
© Siemens AG 2017