Lika SMAG-GA-100-...+MTAG-300 Series User manual

User's guide
SMAG +
MTAG
•SMAG absolute linear encoder
•MTAG guided profile unaffected by dust and liquids
•Measuring length from 115 to 5 0 mm
•Resolution range from 0.1 mm to 0.005 mm
•SSI interface, LSB Right Aligned protocol
Suitable for the following models:
•SMAG -GA-100-...
•SMAG -GA-50-...
•SMAG -GA-10-...
•SMAG -GA-5-...
Table of Contents
Preliminary information 5
1 – Safety summary 6
2 - Identification 8
3 – Mechanical installation 9
4 – SSI interface 12
5 - Maintenance 19
Lika Electronic • Tel. [phone] • [email protected] • www.lika.biz
Smart encoders & actuators

This publication was produced by Lika Electronic s.r.l. 2017. All rights reserved. Tutti i diritti riservati. Alle Rechte vorbehalten. Todos los
derechos reservados. Tous droits r serv s.
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 [email protected] for submitting your
comments, suggestions and criticisms.

Table of contents
User's guide......................................................................................................................................................... 1
Table of 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 (Figure 1)...........................................................................................................................................9
3.2 Mounting instructions.........................................................................................................................................................9
3.3 Sensor (Figure 2)..................................................................................................................................................................10
3.4 Profile of the magnetic tape (Figure 2).....................................................................................................................11
3.5 Measuring length (Figure 1)...........................................................................................................................................11
3.6 Standard counting direction (Figure 2).....................................................................................................................11
4 – SSI interface........................................................................................................................................... 12
4.1 Electrical connections.......................................................................................................................................................12
4.1.1 M8 cable specifications............................................................................................................................................12
4.1.2 M12 8-pin connector specifications...................................................................................................................12
4.1.3 Connection of the shield.........................................................................................................................................13
4.1.4 Ground connection....................................................................................................................................................13
4.1.5 Zero setting input.......................................................................................................................................................13
4.1.6 Counting direction input.........................................................................................................................................14
4.2 SSI (Synchronous Serial Interface)...............................................................................................................................15
4.3 LSB Right Aligned protocol.............................................................................................................................................16
4.4 Recommended transmission rates...............................................................................................................................18
4.5 Recommended SSI circuit................................................................................................................................................18
5 - Maintenance........................................................................................................................................... 19

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 and objects both of the device and the interface 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 information the operator needs to correctly and
safely install and operate the linear encoders with guided profile of the SMAG series that provide SSI
interface and Gray output code.
The SMAG sensors are engineered to measure linear displacements in industrial machines and
automation lines.
The measuring system consists of a magnetic tape mounted on a rigid profile and a magnetic sensor. The
tape has a coded sequence of poles; the distance between two poles is referred to as “pole pitch”. The
sensor moves along the magnetic tape (or, on the contrary, the magnetic tape is moved under the
sensor), thus the sensor detects the displacement and issues an output signal equivalent to the one
generated by an absolute encoder or an optical linear scale.
The sensor must be compulsorily paired with the MTAG magnetic tape. The measuring length is from
115 mm (4.528”) to 570 mm (22.441”), see the order code.
For technical specifications please refer to the product datasheet.
To make it easier to read the text, this guide can be divided into some main sections.
In the first section (from chapter 1 to chapter 3) some general information concerning the safety, the
mechanical installation and the electrical connection as well as tips for setting up and running properly
and efficiently the SMAG linear encoder + MTAG are provided.
In the second section, entitled SSI Interface (chapter 4), you can find detailed information on the SSI
interface.

SMAG + MTAG SSI
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
devices;
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 ”4.1 Electrical connections”
section on page 12;
connect Zero Setting input to 0Vdc, if not used; to zero set the encoder,
connect Zero setting input to +Vdc for 100 µs at least, then disconnect +Vdc;
normally voltage must be at 0Vdc; zero set must be performed after
Counting direction setting; we suggest performing the zero set when the
encoder is in stop;
connect Counting direction input to 0Vdc, if not used; to have count up
information when the measuring system moves as shown in Figure 2 (see the
arrows) = connect to 0Vdc; to have count up information when the
measuring system moves in the direction opposite to the movement shown
in Figure 2 (see the arrows) = connect to +Vdc;
in compliance with 2014/30/EU norm on electromagnetic
compatibility, 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;
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SMAG + MTAG SSI
- minimize noise by connecting the shield or the connector housing 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 “3 – Mechanical
installation” section on page 9;
mechanical installation has to be carried out with stationary mechanical
devices;
do not disassemble the unit;
do not tool the unit;
delicate electronic equipment: handle with care; do not subject the unit to
knocks or shocks;
protect the unit against acid solutions or chemicals that may damage it;
respect the environmental characteristics declared by manufacturer;
we suggest installing the unit providing protection means against waste,
especially swarf as turnings, chips, or filings; 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 scale from jamming.
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SMAG + MTAG SSI
2 - Identification
Device can be identified through the order code and the serial number printed
on the label applied to its body. 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: devices 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).
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SMAG + MTAG SSI
3 – Mechanical installation
WARNING
Installation and maintenance operations must be carried out by qualified
personnel only, with power supply disconnected and mechanical parts
absolutely in stop.
3.1 Overall dimensions (Figure 1)
(values are expressed in mm)
Figure 1
L = 195 mm / 7.677” ÷ 650 mm / 25.59” (see the order code of the MTAG
profile)
3.2 Mounting instructions
Install and use the product in conformance with the protection level it has been
designed to. Protect the unit against knocks, frictions and solvents and avoid
temperatures over the allowed range.
Make sure the unit is mounted where hard or sharp objects (e.g. turnings, chips
or filings) do not come into contact with the magnetic tape and the bottom of
the sensor head. If these conditions cannot be avoided provide adequate
cleaning measures (as for instance brushes, scrapers, jets of compressed air, etc.)
in order to prevent the sensor and the magnetic tape from jamming.
The profile of the magnetic tape must be inserted in the track at the bottom of
the sensor enclosure; the shape of the track is univocal in order to prevent
mounting errors.
Two mounting options are allowed:
1. you can fasten the profile of the magnetic tape to a fixed support and
move the sensor;
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SMAG + MTAG SSI
2. or, on the contrary, you can fasten the sensor to a fixed support and
move the profile of the magnetic tape.
It is customer's duty to evaluate the type of installation that is most suitable for
his application. Anyway both the sensor and the profile (according to your
choice) must be able to slide freely and accomplish a smooth linear travel.
Figure 2
3.3 Sensor (Figure 2)
The sensor can be secured:
1. to a sliding carriage;
2. to an actuator;
3. to a mobile support;
4. or to a fixed support.
Use four TCEI M4 UNI 5931 type cylinder head screws inserted from the top
in the holes provided at the four angles of the enclosure. The screws must be 30
mm min. long (see Figure 1). The maximum tightening torque is 1.2 Nm. We
suggest adding a few drops of threadlocker of medium bond strength.
The fixing support will be placed at the bottom of the sensor case. Make sure
the cable does not block or hamper the movement of the sensor.
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