Lika SMS12, SMS21, SMS11 User Manual
User's guide
SMS12
• Incremental linear encoder for 1-mm pole pitch tape
• Resolution 1 mm / 0.039”
• Measuring length up to 100 m / 328 ft
• IP67 protection rate
• 1Vpp sinusoidal outputs
• With external limit switches to mark off the travel
Suitable for the following models:
• SMS12
Table of Contents
Safety summary 6
Identification 8
Mechanical installation 9
Electrical connection 18
Maintenance and troubleshooting 28
Lika Electronic • Tel. +39 0445 806600 • info@lika.biz • www.lika.biz
Smart encoders & actuators
This publication was produced by Lika Electronic s.r.l. 2018. All rights reserved. Tutti i diritti riservati. Alle Rechte vorbehalten. Todos los
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This document and information contained herein are the property of Lika Electronic s.r.l. and shall not be reproduced in whole or in
part without prior written approval of Lika Electronic s.r.l. Translation, reproduction and total or partial modification (photostat copies,
film and microfilm included and any other means) are forbidden without written authorisation of Lika Electronic s.r.l.
The information herein is subject to change without notice and should not be construed as a commitment by Lika Electronic s.r.l. Lika
Electronic s.r.l. reserves the right to make all modifications at any moments and without forewarning.
This manual is periodically reviewed and revised. As required we suggest checking if a new or updated edition of this document is
available at Lika Electronic s.r.l.'s website. Lika Electronic s.r.l. assumes no responsibility for any errors or omissions in this document.
Critical evaluation of this manual by the user is welcomed. Your comments assist us in preparation of future documentation, in order
to make it as clear and complete as possible. Please send an e-mail to the following address info@lika.it for submitting your
comments, suggestions and criticisms.
General contents
User's guide............................................................................................................................................................................................1
General contents.............................................................................................................................................................................3
Typographic and iconographic conventions...................................................................................................................4
Preliminary information..............................................................................................................................................................5
1 Safety summary..................................................................................................................................... 6
1.1 Safety.............................................................................................................................................................................6
1.2 Electrical safety.........................................................................................................................................................6
1.3 Mechanical safety....................................................................................................................................................7
2 Identification......................................................................................................................................... 8
3 Mechanical installation....................................................................................................................... 9
3.1 Overall dimensions...................................................................................................................................................9
3.2 Sensor and scale / ring combination.............................................................................................................10
3.3 Magnetic tape.........................................................................................................................................................10
3.4 Magnetic rings........................................................................................................................................................10
3.5 Mounting the sensor with magnetic tape..................................................................................................11
3.6 Mounting the sensor with “R” / “T” Reference..........................................................................................13
3.7 Mounting the sensor with LS1 and LS2 limit switches.........................................................................14
3.8 Measuring length..................................................................................................................................................15
3.9 Mounting the sensor with MRI magnetic rings.......................................................................................15
3.10 Standard counting direction..........................................................................................................................17
3.11 Optional cleaning wipers (Figure 1).............................................................................................................17
4 Electrical connection.......................................................................................................................... 18
4.1 M10 cable connection.........................................................................................................................................18
4.2 M10 cable specifications....................................................................................................................................19
4.3 Connection of the shield....................................................................................................................................20
4.4 Ground connection...............................................................................................................................................20
4.5 AB0, /AB0 output channels...............................................................................................................................21
4.6 Counting direction................................................................................................................................................21
4.7 Reference “R” / “T”.................................................................................................................................................22
4.8 Voltage signals........................................................................................................................................................23
4.9 LS1 and LS2 limit switches................................................................................................................................23
4.10 Diagnostic LEDs (Figure 10).............................................................................................................................25
4.11 Recommended circuit........................................................................................................................................27
5 Maintenance and troubleshooting................................................................................................. 28
Typographic and iconographic conventions
In this guide, to make it easier to understand and read the text the following typographic and
iconographic conventions are used:
• parameters are coloured in GREEN;
• alarms are coloured in RED;
• states are coloured in FUCSIA.
When scrolling through the text some icons can be found on the side of the page: they are expressly
designed to highlight the parts of the text which are of great interest and significance for the user.
Sometimes they are used to warn against dangers or potential sources of danger arising from the use of
the device. You are advised to follow strictly the instructions given in this guide in order to guarantee the
safety of the user and ensure the performance of the device. In this guide the following symbols are
used:
This icon, followed by the word WARNING, is meant to highlight the parts of the
text where information of great significance for the user can be found: user must
pay the greatest attention to them! Instructions must be followed strictly in order
to guarantee the safety of the user and a correct use of the device. Failure to heed
a warning or comply with instructions could lead to personal injury and/or damage
to the unit or other equipment.
This icon, followed by the word NOTE, is meant to highlight the parts of the text
where important notes needful for a correct and reliable use of the device can be
found. User must pay attention to them! Failure to comply with instructions could
cause the equipment to be set wrongly: hence a faulty and improper working of
the device could be the consequence.
This icon is meant to highlight the parts of the text where suggestions useful for
making it easier to set the device and optimize performance and reliability can be
found. Sometimes this symbol is followed by the word EXAMPLE when instructions
for setting parameters are accompanied by examples to clarify the explanation.
Preliminary information
This guide is designed to provide the most complete and exhaustive information the operator needs to
correctly and safely install and operate the SMS12 incremental linear encoder.
SMS12 linear encoder is designed to measure linear or angular displacements on industrial machines and
automation systems. The measurement system includes a magnetic tape / magnetic ring and a magnetic
sensor. The tape / ring has alternating magnetic north/south poles that are magnetized at a fixed
distance called the pole pitch. The pole pitch is 1 mm. The conversion electronics inside the sensor
translates the magnetic fields of the tape / ring into sinusoidal electrical signals (1Vpp) equivalent to
those of an incremental encoder or a linear scale. The readhead must be paired with the appropriated
magnetic tape / ring (see the “3.2 Sensor and scale / ring combination” section on page 10).
SMS12 encoder is equipped with two sensors for detecting external limit switches (order code LKM1309/LS). They are designed to mark out the travel of the application. The activation of the sensors is
shown through LEDs.
In addition it also integrates a sensor for detecting an external Reference magnet (order code LKM1309/1) and is equipped with four diagnostic LEDs.
The flexibility of the scale allows the sensor to be used for both linear and angular applications.
Furthermore it can be installed also on round surfaces and magnetic rings.
SMS12
1 Safety summary
1.1 Safety
• Always adhere to the professional safety and accident prevention
regulations applicable to your country during device installation and
operation;
• installation and maintenance operations have to be carried out by
qualified personnel only, with power supply disconnected and stationary
mechanical parts;
• device must be used only for the purpose appropriate to its design: use for
purposes other than those for which it has been designed could result in
serious personal and/or the environment damage;
• high current, voltage and moving mechanical parts can cause serious or
fatal injury;
• warning ! Do not use in explosive or flammable areas;
• failure to comply with these precautions or with specific warnings
elsewhere in this manual violates safety standards of design, manufacture,
and intended use of the equipment;
• Lika Electronic assumes no liability for the customer's failure to comply
with these requirements.
1.2 Electrical safety
• Turn OFF the power supply before connecting the device;
• connect according to the explanation in the ”Electrical connection” section
on page 18;
• the wires of unused output signals must be cut at different lengths and
insulated singularly;
• in compliance with 2014/30/EU norm on electromagnetic
compatibility, the following precautions must be taken:
- before handling and installing the equipment, discharge
electrical charge from your body and tools which may come in touch
with the device;
- power supply must be stabilized without noise; install EMC filters on
device power supply if needed;
- always use shielded cables (twisted pair cables whenever 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;
- to guarantee a correct working of the device, avoid using strong magnets
on or near by the unit;
MAN SMS12 E 1.1 Safety summary 6 of 32
SMS12
- minimize noise by connecting the cable shield and the frame to ground.
Make sure that ground is not affected by noise. The connection point to
ground can be situated both on the device side and on user’s side. The
best solution to minimize the interference must be carried out by the
user;
- do not stretch the cable; do not pull or carry by cable; do not use the
cable as a handle.
1.3 Mechanical safety
• Install the device following strictly the information in the “Mechanical
installation” section on page 9;
• mechanical installation must be carried out with stationary mechanical
parts;
• do not disassemble the unit;
• do not tool the unit;
• delicate electronic equipment: handle with care; do not subject the device
to knocks or shocks;
• protect the unit against acid solutions or chemicals that may damage it;
• respect the environmental characteristics of the product;
• we suggest installing the unit providing protection means against waste,
especially swarf as turnings, chips, or fillings; should this not be possible,
please make sure that adequate cleaning measures (as for instance
brushes, scrapers, jets of compressed air, etc.) are in place in order to
prevent the sensor and the magnetic tape from jamming.
MAN SMS12 E 1.1 Safety summary 7 of 32
SMS12
2 Identification
Device can be identified through the order code and the serial number printed
on the label applied to its enclosure. Information is listed in the delivery
document too. Please always quote the order code and the serial number when
reaching Lika Electronic for purchasing spare parts or needing assistance. For
any information on the technical characteristics of the product refer to the
technical catalogue.
Warning: encoders having order code ending with "/Sxxx" may have
mechanical and electrical characteristics different from standard and
be supplied with additional documentation for special connections
(Technical Info).
MAN SMS12 E 1.1 Identification 8 of 32
SMS12
3 Mechanical installation
WARNING
Installation must be carried out by qualified personnel only, with power supply
disconnected and mechanical parts compulsorily in stop.
3.1 Overall dimensions
(values are expressed in mm)
A
Reference sensor “R” / “T” (page
22)
D Optional cleaning wipers (page 17)
B
Limit switch sensors “LS” (page
23)
E Diagnostic LEDs (page 25)
C Incremental sensor
MAN SMS12 E 1.1 Mechanical installation 9 of 32
SMS12
3.2 Sensor and scale / ring combination
The sensor has to be compulsorily paired with its specific type of magnetic scale
or ring as indicated in the table below. For any information on the scale or ring
please refer to the specific documentation.
Sensor MT tape MRI ring
SMS12
MT10 MRI/xxx-xxx-1
3.3 Magnetic tape
As stated, the sensor model must be compulsorily paired with its specific type of
magnetic scale (see the previous section). For detailed information on the tape
and how to mount it properly, please refer to the specific technical
documentation.
Make sure that the mechanical installation complies with the system's
requirements for distance, planarity and parallelism between the readhead and
the scale indicated in Figure 2 all along the whole measuring length.
MT magnetic tape can be provided with a cover strip to protect its magnetic
surface (see the order code of the magnetic tape).
You can mount the readhead in both directions over the tape. The arrow in
Figure 1 indicates the standard counting direction (the rising edge of A signal
leads the rising edge of B signal) when the sensor moves in the direction
indicated by the arrow; further information in the “4.6 Counting direction”
section on page 21.
The external “R” / “T” Reference magnet order code LKM-1309/1 and the limit
switches “LS” order code LKM-1309/LS must be compulsorily installed as
shown in Figure 3 and Figure 4. For complete information please refer to the
“3.6 Mounting the sensor with “R” / “T” Reference” section on page 13; and to
the “3.7 Mounting the sensor with LS1 and LS2 limit switches” section on page
14.
3.4 Magnetic rings
The flexibility of the scale allows the sensor to be used for both linear and
angular applications. Furthermore it can be installed also on round surfaces and
magnetic rings.
As stated, the sensor model must be compulsorily paired with its specific type of
magnetic ring (see the “3.2 Sensor and scale / ring combination” section).
MAN SMS12 E 1.1 Mechanical installation 10 of 32
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