Lika SME1 User manual

SME1 –SME2 –SME5
MAN SMEx I_E 1.0 5www.lika.it
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User manual
SME1, SME2, SME5
Chapters
1 Safety summary
2 Identification
3 Installation
4 Output signals
5 Electrical connections
6 Dimensional drawing
7 Maintenance
8 Troubleshooting
Description
This manual describes products of the SME1, SME2,
SME5 series. The purpose of these sensors is to
measure linear or angular displacements on
industrial machines and automation systems. The
measurement system includes a magnetic tape and
a magnetic sensor. The tape has alternating
magnetic north/south poles are magnetized at a
certain distance called the pole pitch. As the sensor
is moved along the magnetic tape (or magnetic
ring), it detects the displacement and produces an
output signal equivalent to that of an incremental
encoder or a linear scale. The flexibility of the tape
allows it to be used for both linear and angular
applications.
The sensor has to be matched with the appropriated
magnetic tape (see chap. 2.1).
1 -Safety summary
We strongly recommend carefully reading this user
manual and following the installation guidelines:
•Sensor head should be installed as close as
possible to your control unit.
•Always use shielded cables and twisted if
possible.
•Avoid running the sensor cable near high
voltage power cables (e.g. drive cables).
•Install EMC filters on sensor power supply if
needed.
•Avoid mounting sensor head near capacitive or
inductive noise sources such as relays, motors,
and switching power supplies.
Connect according to the supplied pin-out.
2 -Identification
The sensor can be identified by the label's data
(ordering code, serial number). This information is
listed in the delivery document. All technical
features according to the ordering code are shown
on the catalogue.
2.1 Sensor and tape combinations
Sensor Magnetic tape
SME1 MT10
SME2 MT20
SME5 MT50
3 -Installation
Install the product according to the protection level
provided.
Protect the system against knocks, friction, solvents,
temperatures under -10°C (14°F) and over +70°C
(+158°F).
Be sure that the system is mounted where hard or
sharp objects (e.g. metal chips) do not come into
contact with the magnetic scale and the bottom of
the sensor head. If these conditions cannot be
avoided provide a wiper or pressurized air.
Sensor can be fixed by means of two M3 screws
over the buttonholes. Make sure that the gap
between sensor and tape is in respect with (fig. 8)
along the total measuring length. Avoid contact
between the parts. You can check planarity and
parallelism between sensor and magnetic tape using
a feeler gauge. The max. allowed gap (D) is listed in
chap. 2.1.

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3.1 Mounting tolerances
Sensor
Gap
Sensor/Magnetic tape
(D)
SME1 0,4 mm
SME2 1,0 mm
SME5 2,0 mm
3.2 Mounting gap with Reference
The sensor lights on when the reference output is
active.
Sensor
Gap
Sensor/LKM1309
(D)
SME1 0,1 –0,2 mm
SME2 0,1 –0,8 mm
SME5 0,1 –2,4 mm
3.3 Mounting position with magnetic rings
Sensor
Gap
Sensor/Magnetic ring
(D)
SME1 0,4 mm
SME2 1,0 mm
SME5 2,0 mm
For mounting tolerances refer to paragraph 3.1
4 -Output signals
4.1 Index “I”
With ordering code “N” the output signal "I" is not
available.

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4.2 Index “R”
With ordering code "R" and in combination with
LKM-1309
As the sensor is moved along the magnetic tape, it
detects the displacement and produces an output
signal equivalent to that of an incremental encoder
or a linear scale. The signal output is proportional
to the measuring speed and to the displacement of
the sensor. Resolution after quadrature (4 edge
reading) can be determined by the ordering code on
the sensor.
5 -Electrical connections
Output Colour
Ayellow
/A blue
Bgreen
/B orange
0white
/0 grey
GND black
+Vdcred
* see ordering code
"1" = +5Vdc ± 5%
"2" = +10Vdc +30Vdc
Note: All sensors can have inverted signals.
A = A signal
/A = inverted A signal (or complementary signal)
All our magnetic sensors can have A, /A, B, /B, 0, /0
output signals. We recommend always connecting
the inverted signals if the receiving device will
accept them. Otherwise each output should be
insulated separately.
ATTENTION: connecting /A, /B, or /0 together, to
+Vdc or 0Vdc may cause permanent damage to the
sensor.
5.1 Specifications of the cable
Wires : 6 x 0.14mm2+ 2 x 0.24mm2
Screening : Copper
External Ø : Ø 5.2 mm ± 0.2 mm (Ø 0.2 in ± 0.01in)
Impedance : 6 x 145 Ω, 2 x 87 Ω
Notes:
•While connecting, power must be switched OFF;
•Check correct connections before switching ON;
•We recommend that the sensor head be
mounted as far as possible from any capacitive
or inductive noise source such as motors, relays
and switching devices;
•Avoid routing the sensor cable near high voltage
power cables in order to reduce influences of
electric noise;
•Only use shielded cables and wire with a cross
section between 0,14mm2and 0,5 mm2
•The shield of the cable and 0Vdc wire should be
connected to ground (GND);
•Electric noise sources should be linked with
noise suppression filters;
•Total length of connection cable from sensor to
receiving device should not exceed 50 m (55').

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MAN SMEx I_E 1.0 8www.lika.it
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6 -Dimensional drawing
7 -Maintenance
The magnetic measurement system doesn't need
any particular maintenance but as with all precision
devices it must be handled with care. From time to
time we recommend the following operations:
•Check the gap between sensor and magnetic
tape along the measuring length. Wear of the
machine may increase the tolerances.
•The surface of the magnetic tape should
occasionally be cleaned using a soft cloth to
remove dust, chips, moisture etc.
8 -Troubleshooting
The following list shows some typical errors that
occur during installation and operation of the
magnetic measurement system.
Problem:
The system doesn't work (no pulse output):
•The tape or sensor has been mounted incorrectly
(the active part of the tape doesn't face the
sensor's active side).
•A magnetic piece or tape is in between the
sensor and the tape. Only non-magnetic
materials are allowed between sensor and tape.
•The sensor touches the tape because tolerance
gap between sensor and tape are not observed.
Check sensor's active side if damaged.
•The sensor has been damaged by short circuit or
wrong connection.
Problem:
The measured values are inaccurate:
•The gap between sensor and tape is not
observed along the total measurement length.
•The connection cable runs near to high voltage
cable or shield is not connected correctly. See
chap. 6.
•The max. counting frequency of your receiving
device is too low.
•A section of the magnetic tape has been
damage mechanically or magnetically along the
measuring length
•The measuring error is caused by torsion of the
machine structure. Check parallelism and
symmetry of machine movement.
Lika Electronic
Via S. Lorenzo, 25 –36010 Carrè (VI) -Italy
Tel. [phone]
Fax [phone]
Italy : eMail [email protected] -www.lika.it
World : eMail [email protected] -www.lika.biz