Download - Ejercicios Lab 022311
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Festo Didactic GmbH & Co. FP1110 A-23
To learn about the switching characteristics of an inductive proximity sensor.
Study the exercise. You will find hints and explanations in the textbook ProximitySensors.
Before the practical construction of the exercise, read through the data sheets ofthe components required.
Assemble the components. You can carry out the exercise in accordance with the description in paragraph
"Practical assembly".
Make a note of everything you consider of particular interest.
Warning
The electrical power supply must be switched on only after all connections have
been established and checked. After completion of the exercise, the voltage supply
must be switched off before the components are dismantled.
Exercise 3
Switching distance of an inductive proximity sensor
Training aim
Exercise definition
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Exercise 3
A-24 Festo Didactic GmbH & Co. FP1110
On an assembly station the presence of magazine shafts is monitored usinginductive sensors. Measure the switching distance of various inductive sensors in
order to determine the switching distance between a metal object and the sensor.
2
1
Inductive proximity switch (1), Magazine shaft (2)
Problem description
Positional sketch
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Exercise 3
Festo Didactic GmbH & Co. FP1110 A-25
Inductive sensors contain an oscillator circuit, which consists of a parallel resonancecircuit with inductance and capacitance as well as an amplifier. By means of a ferrite
shell core of the inductance (coil), the electromagnetic field is directed towards the
outside.
If an electrically conductive material is introduced into the electromagnetic stray
field then, according to the laws of inductance, eddy currents are created, which
attenuate oscillation. Depending on the conductivity, the dimensions and the
distance of the approaching object, the oscillator can be attenuated to such an
extent that oscillation stops. Attenuation of the oscillator is evaluated via
subsequent electronic devices, and an output signal generated.
6
Oscillator (1), Demodulator (2), Triggering stage (3), Switching status
indicator (LED) (4), Output stage with protective circuit (5), External voltage (6),
Internal stabilised voltage (7), Active switching zone (coil) (8),
Switching output (9)
Function description
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Exercise 3
A-26 Festo Didactic GmbH & Co. FP1110
1
3
4
2
1020304050 100 20 30 50 60 70 80 90 100
Item no. Qty. Designation
1 1 Distribution unit, D:ER-VERT-SENSOR-...
2 1 Positioning slide, D:ER-VS-FP1110-...
1 Vernier caliper, D:AS-MS
3 1 Inductive sensor unit 1, D:ER-SIEH-M18B-...
4 1 Inductive sensor unit 2, D:ER-SIEH-M12B-...
1 Set of test objects, mild steel S 235 JR, part 3
Layout
Components list
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Exercise 3
Festo Didactic GmbH & Co. FP1110 A-27
1
BN(1)
BU(3)
BK(4)
2
Item no. Qty. Designation
1 1 Distribution unit, D:ER-VERT-SENSOR-...
2 1 Inductive sensor unit 1, D:ER-SIEH-M18B-...
or
Inductive sensor unit 2, D:ER-SIEH-M12B-...
BN(1)
BU(3)
BK(4)
+24 V DC
0 V
Electrical connections
Electrical circuit diagram
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Exercise 3
A-28 Festo Didactic GmbH & Co. FP1110
Mount the distribution unit, the positioning slide and the inductive sensor unit 1onto the profile plate. The inductive sensor is mounted centrally in front of the
middle of the positioning slide (see fig. "Layout"). Connect the 24V electrical power
supply and the inductive sensor to the distribution unit (see fig. "Electrical
connections").
Attach the vernier caliper to the positioning slide.
Now take the calibrating plate in mild steel (S 235 JR, part 3) from the set of test
objects and fit it into the material fixture of the positioning slide.
Measure the switching distance of the sensor. Make a note of the point, at which the
signal change occurs when the plate approaches the sensor, and also the point at
which the signal change occurs when you move the plate away from the sensor. The
difference between these two points is the hysteresis of the sensor.
Hysteresis (mm) = Switch-off point (mm) Switch-on point (mm)
Carry out the same measurements with the inductive sensor unit 2.
Repeat the measurements several times in order to check the reproducability of theswitching distance.
Mounting the vernier caliper
When mounting the vernier caliper, the slide unit of the positioning slide is set at
"0". The two measuring pointers are moved apart by approximately 10 mm. The
vernier caliper is placed parallel to the base plate, flush with the edge, so that the
front pointer is adjacent to the stop for the vernier caliper. The body of the caliper is
attached to the base plate of the positioning slide by means of the two retaining
magnets.
Practical assembly 1
Practical assembly 2
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Exercise 3
Festo Didactic GmbH & Co. FP1110 A-29
Inductive sensor unit 1 (D:ER-SIEH-M18B-...)
Switch-on point:
Switch-off point:
Hysteresis:
Inductive sensor unit 2 (D:ER-SIEH-M12B-...)
Switch-on point:
Switch-off point:
Hysteresis:
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Evaluation
Conclusions
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Exercise 3
A-30 Festo Didactic GmbH & Co. FP1110
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Festo Didactic GmbH & Co. FP1110 A-31
To learn that the switching distance of inductive proximity sensors is dependent onmaterials when sensing different metals.
Study the exercise. You will find hints and explanations in the textbook ProximitySensors.
Before the practical construction of the exercise, read through the data sheets ofthe components required.
Assemble the components. You can carry out the exercise in accordance with the description in paragraph
"Practical assembly".
Make a note of everything you consider of particular interest.
Warning
The electrical power supply must be switched on only after all connections have
been established and checked. After completion of the exercise, the voltage supply
must be switched off before the components are dismantled.
Exercise 4
Sensing of different metals with inductive proximity sensors
Training aim
Exercise definition
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Exercise 4
A-32 Festo Didactic GmbH & Co. FP1110
On a conveyor, metal containers are used for the transport of assembly parts. Theposition of the containers on the individual station is defined by means of an
inductive sensor. A selection of containers in different materials is available. The
effect of the different materials on the switching distance is to be examined.
Problem description
Positional sketch
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Exercise 4
Festo Didactic GmbH & Co. FP1110 A-33
1
3
2
1020304050 100 20 30 50 60 70 80 90 100
Item no. Qty. Designation
1 1 Distribution unit, D:ER-VERT-SENSOR-...
2 1 Positioning slide, D:ER-VS-FP1110-...
1 Vernier caliper, D:AS-MS
3 1 Inductive sensor unit 1, D:ER-SIEH-M18B-...
The components list is continued on the following page.
Layout
Components list
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Exercise 4
A-34 Festo Didactic GmbH & Co. FP1110
Item no. Qty. Designation
1 Set of test objects, mild steel S 235 JR, part 3
1 Set of test objects, stainless steel, part 4
1 Set of test objects, aluminium, part 5
1 Set of test objects, brass, part 6
1 Set of test objects, copper, part 7
Components list(continued)
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Exercise 4
Festo Didactic GmbH & Co. FP1110 A-35
1
BN(1)
BU(3)
BK(4)
2
Item no. Qty. Designation
1 1 Distribution unit, D:ER-VERT-SENSOR-...
2 1 Inductive sensor unit 1, D:ER-SIEH-M18B-...
BN(1)
BU(3)
BK(4)
+24 V DC
0 V
Electrical connections
Electrical circuit diagram
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Exercise 4
A-36 Festo Didactic GmbH & Co. FP1110
Mount the distribution unit, the positioning slide and the inductive sensor unit 1 onthe profile plate. The inductive sensor is to be mounted centrally in front of the
positioning slide (see fig. "Layout"). Connect the 24V electrical power supply and
the inductive sensor to the distribution unit (see fig. "Electrical connections").
Attach the vernier caliper to the positioning slide.
Measure the switching distance of the sensor for the different materials from the set
of test objects. Make a note of the point at which the change-over occurs, when the
plate approaches the sensor, as well as of the point of change-over when you move
the plate away from the sensor.
Take the mild steel plate (S 235 JR, part 3) from the set of test objects and fit it into
the material fixture of the positioning slide.
Take the various metal plates (stainless steel, aluminium, brass and copper) from
the set of test objects and carry out the measurements.
Determine the reduction factor of the switching distance for the different materials.
The reduction factor for mild steel (S 235 JR) is 1. With the other items, you can
obtain their respective value by dividing the determined switching distance by the
value of the switching distance for mild steel.
Mounting the vernier caliper
When mounting the vernier caliper, the slide unit of the positioning slide is set at
"0". The two measuring pointers are moved apart by approximately 10 mm. The
vernier caliper is placed parallel to the base plate, flush with the edge, so that the
front pointer is adjacent to the stop for the vernier caliper. The body of the caliper is
attached to the base plate of the positioning slide by means of the two retaining
magnets.
Practical assembly
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Exercise 4
Festo Didactic GmbH & Co. FP1110 A-37
Material Switch-on point
[mm]
Switc-off point
[mm]
Hysteresis
[mm]
Reduction factor
Mild steel
S 235 JR,
part 3
1
Stainless steel,
part 4
Aluminium,
part 5
Brass,
part 6
Copper,
part 7
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Evaluation
Conclusions
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Exercise 4
A-38 Festo Didactic GmbH & Co. FP1110
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Festo Didactic GmbH & Co. FP1110 A-39
To learn about the influence of objects of different size on the switching distance ofan inductive proximity sensor.
Study the exercise. You will find hints and explanations in the textbook ProximitySensors.
Before the practical construction of the exercise, read through the data sheets ofthe components required.
Assemble the components. You can carry out the exercise in accordance with the description in paragraph
"Practical assembly".
Make a note of everything you consider of particular interest.
Warning
The electrical power supply must be switched on only after all connections have
been established and checked. After completion of the exercise, the voltage supply
must be switched off before the components are dismantled.
Exercise 5
Influence of the object surface on the switching distance
Training aim
Exercise definition
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Exercise 5
A-40 Festo Didactic GmbH & Co. FP1110
Metallic objects of different size must be detected on a rotary indexing table by aninductive sensor. Only parts made from mild steel (S 235 JR) are to be detected.
Investigate the influence of the object size on the switching distance of the sensor.
Problem description
Positional sketch
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Exercise 5
Festo Didactic GmbH & Co. FP1110 A-41
1
3
2
1020304050 100 20 30 50 60 70 80 90 100
Item no. Qty. Designation
1 1 Distribution unit, D:ER-VERT-SENSOR-...
2 1 Positioning slide, D:ER-VS-FP1110-...
1 Vernier caliper, D:AS-MS
3 1 Inductive sensor unit 1, D:ER-SIEH-M18B-...
The components list is continued on the following page.
Layout
Components list
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Exercise 5
A-42 Festo Didactic GmbH & Co. FP1110
Item no. Qty. Designation
1 Set of test objects, mild steel S 235 JR, 30 mm x 30 mm, part 11
1 Set of test objects, mild steel S 235 JR, 25 mm x 25 mm, part 12
1 Set of test objects, mild steel S 235 JR, 20 mm x 20 mm, part 13
1 Set of test objects, mild steel S 235 JR, 15 mm x 15 mm, part 14
1 Set of test objects, mild steel S 235 JR, 10 mm x 10 mm, part 15
1 Set of test objects, mild steel S 235 JR, 5 mm x 5 mm, part 16
Components list(continued)
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Exercise 5
Festo Didactic GmbH & Co. FP1110 A-43
1
BN(1)
BU(3)
BK(4)
2
Item no. Qty. Designation
1 1 Distribution unit, D:ER-VERT-SENSOR-...
2 1 Inductive sensor unit 1, D:ER-SIEH-M18B-...
BN(1)
BU(3)
BK(4)
+24 V DC
0 V
Electrical connections
Electrical circuit diagram
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Exercise 5
A-44 Festo Didactic GmbH & Co. FP1110
Mount the distribution unit, the positioning slide, and the inductive sensor unit 1 onthe profile plate. The inductive sensor should be mounted offset by 5 cm against the
centre of the positioning slide (see fig. "Layout"). Connect the 24V electrical power
supply and the inductive sensor to the distribution unit (see fig. "Electrical
connections").
Attach the vernier caliper to the positioning slide.
Take the mild steel plates of different length (parts 11 - 16) from the set of test
objects and carry out the measurements. Measure the switching distance of the
proximity sensor for each of the plates. Make a note of the measurements at which a
signal change occurs when the plates approach the sensor.
Mounting the vernier caliper
When mounting the vernier caliper, the slide unit of the positioning slide is set at
"0". The two measuring pointers are moved apart by approximately 10 mm. The
vernier caliper is placed parallel to the base plate, flush with the edge, so that the
front pointer is adjacent to the stop for the vernier caliper. The body of the caliper is
attached to the base plate of the positioning slide by means of the two retaining
magnets.
Note
The object of this exercise is to determine the relation between the switching
distance and the size of the object. Standard EN 50 010 specifies a standard
calibrating plate for defining the nominal switching distance. The standard
calibrating plate for an inductive sensor is 1 mm thick and has an edge length either
of the diameter of the inscribed circle of the active surface of the sensor or three
times the length of the nominal switching distance of the sensor, whichever value is
the larger.
For the sensor used, the nominal switching distance is 7 mm and the diameter of the
active surface 16 mm. The standard calibrating plate sides must thus have a length
of 21 mm.
Practical assembly
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Exercise 5
Festo Didactic GmbH & Co. FP1110 A-45
Length of sides Switching gap [mm]
Mild steelS 235 JR,
part 11: 30 mm
Mild steel S 235 JR,
part 12: 25 mm
Mild steel S 235 JR,
part 13: 20 mm
Mild steel S 235 JR,
part 14: 15 mm
Mild steel S 235 JR,part 15: 10 mm
Mild steel S 235 JR,
part 16: 5 mm
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Evaluation
Conclusions
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Exercise 5