766
Positioning Systems
5
Positioning Systems,
Inductive Positioning Systems
5
.1
Positioning Systems,
Distance Measurement Devices
5
.2
Positioning Systems,
Position Encoding System
WCS
5
.3
Positioning Systems,
Data Matrix Positioning System
PCV
5
.4
Positioning Systems,
Electronic CAM-Switch Controller
PAX
5
.5
Positioning Systems,
Accessories
5
.6
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PMI Inductive Analog Measuring Systems
From switch to positioning measuring technology
The sensors used in inductive positioning measuring technology (PMI)
are a further development of the traditional inductive proximity switch. By
arranging several coils next to each other, a processor can be used to
calculate the exact position of a metallic actuator. Based on this measure-
ment, the sensor provides the result as an output signal that is propor-
tional to the path or angle.
In addition to the analog current signal (4 mA ... 20 mA) or voltage signal
(0
V ... 10 V), PMI sensors often also offer binary switching element func-
tions. This enables limit switch positions to be implemented in addition to
the measured path information.
Special technical features:
Noncontact path and angle positioning
The inductive functional principle of these sensors enables contact-free
position measurement. This measuring technique operates entirely with-
out wear and provides reliable position and switching signals even in the
most extreme ambient conditions.
Simple steel actuator
PMI sensors react to a simple steel actuator. The actuating element can
therefore be designed as a part of the machine module or the machine
bed.
Three-in-one – combined measuring and switching ele-
ment functions
The combination of measuring and switching element functions can re-
place up to three standard sensors. For comprehensive hub valve con-
trol, in addition to the continuous determination of the current opening
state, both end stop positions valve OPEN and valve CLOSED can be
fed back separately.
Functional description of inductive positioning
sensors
In PMI technology, multiple
coils are positioned in two
rows on a coil carrier. If an
actuator passes over the coil
arrangement, this results in a
path-dependent attenuation
pattern over the coils. The at-
tenuation level for adjacent
coils is compared in order to
determine the exact position
of the actuator.
Actuators are offered as original accessories, however, an actuator can
be produced as part of a machine module. In order to achieve the speci-
fied performance data, certain mechanical dimensions and mounting
conditions must be adhered to when reproducing the actuator.
Material and dimensions of the actuator
Actuators for PMI sensors are made out of mild steel. Construction steel
1.0037 (
formerly ST37) is used
as the reference material. When
using other materials, you must
take into account that the sen-
sor will not provide the specified
measurement accuracy. To pro-
vide protection against corro-
sion, the actuator’s surface can be burnished, varnished, or galvanized.
The actuator must present a coplanar surface with two non-rounded
edges to the measuring surface of the sensor. The required width of the
actuator is 8 mm or 13 mm depending on the sensor type. The actuator
must be long enough to completely overlap the active sensor area. The
type-related detailed dimensions are included in the corresponding data
sheet.
Mounting conditions
The sensor and actuator together make up the positioning system.To en-
sure proper performance with the corresponding measurement accuracy,
the actuator must neither leave the detection range [a] of the sensor, nor
exceed the type-specific distance [b]. The type-related mounting condi-
tions are included in the corresponding data sheet.
Inductive positioning systems can be flush-mounted on a machine ele-
ment. They can be mounted side-by-side or end to end. To avoid cross-
talk between the sensors, either two different actuators or one actuator
with an insulation layer [B] are to be used between the sensors. The de-
tailed dimensions for reproducing the actuator are included in the cor-
responding data sheet.
Inductive positioning systems
PMI-F90
The PMI-F90 inductive positioning system is available in three different
measured lengths of 80 mm, 104 mm, and 120 mm. In addition to the
positioning types with analog signal output designed solely for position-
ing, types are also available with combined analog interface and binary
switching element functions.
PMI-F110
For longer measuring ranges, the PMI-F110 types are available in five
different measured lengths from 210 mm to 960 mm. The sensors in the
F110 Series provide an analog output signal that is either 0 V ... 10 V or
4
mA ... 20 mA. They can be mounted flexibly in the machine bed using
steplessly adjustable t-slides.
PMI-F112
The PMI-F112 Series offers a measuring range of up to 14 mm and has
a compact housing design.The analog voltage signal (0 V ... 10 V) is con-
tinuously adjustable between 7 mm and 14 mm on the measuring range.
In addition to the standard type with analog interface, a configurable ver-
sion is available with an IO-Link interface.
Inductive angular positioning system
PMI-F130
The angle-measuring PMI-F130 types are constructed similarly to the
linear positioning sensors. The metallic actuator is integrated in a puck
as an accessory that can be mounted onto a rotating drive shaft. The air
gap between the sensor and the puck enables wear-free pick-up of the
rotation angle.
The PMI-F130 Series includes three different function types. In its basic
function, the sensor feeds back the measured rotation angle as an analog
current signal (4 mA ... 20 mA) or a voltage signal (0 V ... 10 V). The de-
sired rotation angle range can be scaled for the output range. Similarly to
the PMI-F90 positioning sensor, the F130 is also available as an angular
sensor with two configurable switching window functions. A further type is
also available with three separately configurable switching window func-
tions. This version can be used as an electronic cam-operated switch.
Mounting conditions for actuators
on positioning sensors
Side-by-side arrangement, cascading of
positioning sensors
Outline of angular positioning system with
central opening for the actuator
Dimensions and mounting conditions for
reproducing the actuator
Positioning Systems
