Lika SME1 User manual

SME1  SME2  SME5
User manual
SME1, SME2, SME5
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).
Chapters
1 Safety summary
2 Identification
3 Mounting instructions
4 Electrical connections
5 Output signals
6 Dimensional drawing
7 Maintenance
8 Troubleshooting
1  Safety summary
Safety
• observe the professional safety and accident prevention
regulations applicable to your country during device
installation and operation;
• installation has to be carried out by qualified personnel
only without power supply and stationary mechanics
parts;
• the device must be used only for the purpose appropriate
to its design;
• high current voltage and rotating parts can cause serious
or fatal injury.
Electrical safety
• switch OFF the voltage before connecting the device;
• connect according to instructions of “Electrical
connections”;
• according to the 89/336/CEE norm on
electromagnetic compatibility following
precautions must be taken:
< before handling and installing discharge electrical charge
from your body and tools which may come in touch with
the device;
< power supply must be stable without noise install EMC
filters on device power supply if needed;
< always use shielded and twisted cables if possible;
< avoid cables runs longer than necessary;
< avoid running the signal cable near high voltage power
cables;
< mount the device as far as possible from any capacitive or
inductive noise source shield the device from noise source
if needed;
< minimize noise by connecting shield and device housing to
ground (GND). Make sure that ground (GND) is not
affected by noise.
Mechanical safety
• install according to the section “Mounting instructions”
with stationary mechanics parts;
• do not disassemble the device;
• do not tool the device;
• do not subject the device to knocks or shocks;
• protect the system against solvents and substances
damaging it;
• respect the environmental characteristics of the product;
• be sure that the system is mounted where hard or sharp
objects (e.g. metal chips) do not come into contact with
the magnetic tape and the bottom of the sensor head. If
these conditions cannot be avoided provide a wiper or
pressurized air.

SME1  SME2  SME5
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  Mounting instructions
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. 1) 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
Sensor Gap Sensor/
Magnetic tape (D)
Gap Sensor/
Protection
profile (D)
SME1 0 1 < 0 4 mm 0 1 < 0 2 mm
SME2 0 1 < 1 0 mm 0 1 < 0 7 mm
SME5 0 1 < 2 0 mm 0 1 < 1 7 mm
3 1 Mounting gap with Reference “R”
The Led ON indicates that the zero signal is enabled
(distance between sensor and LKM1309 is correct).
If the zero signal is not present on the output when
Led is ON move the Reference Mark (LKM1309) of
about half pole length to align it with the tape
while keeping the same distance from the sensor.
D: gap to be kept between sensor and LKM1309.
D2: distance from the centre of fixing hole to the
edge of Reference Mark.
SMEx  LKM1309
D D2
SME1 < LKM1309/1 0 1 < 0 3 mm 7 3 mm
SME2 < LKM1309/2 0 5 < 0 7 mm 7 5 mm
SME5 < LKM1309/5 0 5 < 1 0 mm 7 5 mm

SME1  SME2  SME5
3 2 Mounting position with magnetic rings
Sensor Gap Sensor/
Magnetic ring (D)
SME1 0 1 < 0 4 mm
SME2 0 1 < 1 0 mm
SME5 0 1 < 2 0 mm
3 3 Mounting position with Reference “Z”
The active part of the magnetic sensor consists of a
detector for Reference and a detector for
incremental counting. The Reference is to the left of
the incremental detector (looking down the active
part of the sensor with the cable to the bottom).
3 3 1 Mounting position with magnetic rings
and Reference “Z”
Take care to the mounting of the sensor respect the
magnetic ring.
The arrow on the label showing "Reference pole”
indicates the side of Reference “Z”.
Sensor Magnetic ring
Reference pole Incremental
Reference LED
Reference pole
Led
Label
Magnetic ring

SME1  SME2  SME5
4  Electrical connections
Colour Function
Yellow A
Blue /A
Green B
Orange /B
White 0
Grey /0
Black GND
Red +Vdc *
* see ordering code
Examples
SME2<L<1<… +Vdc = +5Vdc ± 5%
SME5<Y<2<… +Vdc = +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.
4 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
Total length of connection cable from sensor to
receiving device should not exceed 50 m (55');
4 2 GND connections
Minimize noise by connecting shield and device
housing to ground (GND). Make sure that ground
(GND) is not affected by noise.

SME1  SME2  SME5
5  Output signals
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 1 Index “I”
With ordering code “N” the output signal "I" is not
available.
5 2 Reference “R” and “Z”
With ordering code "R" and in combination with
LKM<1309.
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.

SME1  SME2  SME5
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.

SME1  SME2  SME5
Man Vers Description
1.0 1st issue
1.1 Revision of chap. 1 3 4 and 5
1.2 Revision of chap. 3.1
1.3 Revision of chap. 3.1
1.4 Revision of chap. 3.1 and 5.2