Lika SMAX-BG series, SMAX-AI1 series, SMAX-GG series, SMAX-AV2 series User Manual
User's guide
SMAX
• Cost-effective absolute linear encoder
• Measuring length up to 600 mm / 23.622”
• Resolution down to 0.1 mm
• SSI and voltage/current analogue interfaces
• Up to IP69K protection rate
Suitable for the following models:
• SMAX-BG-...
• SMAX-GG-...
• SMAX-AI1-...
• SMAX-AV2-...
Table of Contents
1 - Safety summary 7
2 - Identification 8
3 - Mounting instructions 9
4 - SSI interface 13
5 - Analogue interface 20
6 - Diagnostic LED 28
7 - Maintenance 29
8 - Troubleshooting 30
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. 2017. 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.
Table of Contents
User's guide......................................................................................................................................................... 1
Table of Contents............................................................................................................................................... 3
Typographic and iconographic conventions................................................................................................. 5
Preliminary information.................................................................................................................................... 6
1 - Safety summary....................................................................................................................................... 7
1.1 Safety......................................................................................................................................................................................7
1.2 Electrical safety...................................................................................................................................................................7
1.3 Mechanical safety..............................................................................................................................................................8
2 - Identification............................................................................................................................................ 8
3 - Mounting instructions............................................................................................................................ 9
3.1 Overall dimensions............................................................................................................................................................9
3.2 Magnetic tape.....................................................................................................................................................................9
3.3 Mounting the sensor.....................................................................................................................................................10
3.4 Measuring length............................................................................................................................................................12
3.5 Standard counting direction......................................................................................................................................12
4 - SSI interface........................................................................................................................................... 13
4.1 SSI interface electrical connections........................................................................................................................13
4.1.1 M8 cable specifications......................................................................................................................................13
4.1.2 M12 8-pin connector..........................................................................................................................................13
4.1.3 Connection of the shield...................................................................................................................................14
4.1.4 Ground connection..............................................................................................................................................14
4.1.5 Zero setting input.................................................................................................................................................14
4.1.6 Counting direction input...................................................................................................................................15
4.2 SSI (Synchronous Serial Interface)...........................................................................................................................15
4.2.1 MSB left aligned protocol.................................................................................................................................17
4.2.2 Recommended transmission rates................................................................................................................18
4.3 Recommended SSI circuit............................................................................................................................................19
5 - Analogue interface................................................................................................................................ 20
5.1 Analogue interface electrical connections...........................................................................................................20
5.1.1 M8 cable specifications......................................................................................................................................20
5.1.2 M12 8-pin connector..........................................................................................................................................21
5.1.3 Connection of the shield...................................................................................................................................21
5.1.4 Ground connection..............................................................................................................................................21
5.2 Signals description..........................................................................................................................................................21
5.2.1 0Vdc............................................................................................................................................................................21
5.2.2 START input.......................................................................................................................................................21
5.2.3 +Iout current analogue output......................................................................................................................21
5.2.4 +Vout voltage analogue output....................................................................................................................21
5.2.5 STOP input.........................................................................................................................................................22
5.2.6 Fault output............................................................................................................................................................22
5.2.6.1 Fault output connected to a PLC input.............................................................................................22
5.2.6.2 Fault output connected to a relay.......................................................................................................23
5.3 TEACH-IN procedure......................................................................................................................................................24
5.3.1 TEACH-IN procedure...........................................................................................................................................25
5.3.2 Ascending and descending ramp...................................................................................................................26
5.4 Recommended current analogue output circuit...............................................................................................27
5.5 Recommended voltage analogue output circuit...............................................................................................27
6 - Diagnostic LED....................................................................................................................................... 28
7 - Maintenance........................................................................................................................................... 29
8 - Troubleshooting..................................................................................................................................... 30
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 Lika device and 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 and exhaustive information the operator needs to
correctly and safely install and operate the SMAX absolute linear encoder with SSI and analogue
interfaces.
This encoder is designed to measure linear displacements in industrial machines and automation systems.
The measurement system includes a magnetic tape and a magnetic sensor with conversion electronics.
The tape is magnetized with a coded sequence of North-South poles generating a pseudo-random
absolute pattern. As the sensor is moved along the magnetic tape, it detects the displacement and yields
the absolute position information through the SSI interface (SMAX-BG..., SMAX-GG...) or the voltage
(SMAX-AV2...) / current (SMAX-AI1...) analogue interface or the Modbus interface (SMAX-MB...). The
Modbus sensor is provided with its own technical documentation.
It is mandatory to pair the sensor with the MTAX type magnetic scale. The measuring length can be
200 mm / 7.874”, 300 mm / 11.811” and 600 mm / 23.622”, see the order code.
To make it easier to read and understand the text, this guide can be divided into three main sections.
In the first section 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 unit are
provided.
In the second section, entitled SSI interface, both general and specific information is given on the SSI
interface.
In the third section, entitled Analogue interface, both general and specific information is given on the
analogue interface.
SMAX - SSI and analogue
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 power supply before connecting the device;
• connect the unit according to the explanation in the ”Electrical
connections” section;
• connect Zero Setting and Counting direction inputs 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;
- Counting direction: increasing count (count up information) = connect
to 0Vdc; decreasing count (count down information) = 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;
- minimize noise by connecting the shield and/or the connector housing
and/or the sensor to ground. Make sure that ground is not affected by
noise. The connection point to ground can be situated both on the device
MAN SMAX SSI_AI1_AV2 E 1.5.odt 1 - Safety summary 7 of 32
SMAX - SSI and analogue
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 - Mounting
instructions” section;
• mechanical installation has to 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 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.
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 datasheet.
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).
MAN SMAX SSI_AI1_AV2 E 1.5.odt 2 - Identification 8 of 32
SMAX - SSI and analogue
3 - Mounting instructions
WARNING
Installation has to 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)
3.2 Magnetic tape
The sensor has to be paired with the MTAX type magnetic tape only. For
detailed information on the MTAX type tape and how to mount it properly,
please refer to the specific technical documentation.
Install 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.
Make sure the mechanical installation meets the system's requirements of
distance, planarity and parallelism between the sensor and the scale indicated in
Figure 2 all along the whole measuring length.
MTAX magnetic scale can be provided with a cover strip to protect its magnetic
surface (see the order code).
Figure 1 shows how the sensor and the scale must be installed; the arrow
indicates the standard counting direction (increasing count when the sensor
MAN SMAX SSI_AI1_AV2 E 1.5.odt 3 - Mounting instructions 9 of 32
SMAX - SSI and analogue
moves in the direction indicated by the arrow; further information in the “4.1.6
Counting direction input” section on page 15).
WARNING
The system cannot operate if mounted otherwise than illustrated in Figure 1.
3.3 Mounting the sensor
Figure 1
Make sure the mechanical installation complies with the system requirements
concerning distance, planarity and parallelism between the sensor and the scale
as shown in Figure 2. Avoid contact between the parts. Fix the sensor by means
of two M4 25 mm min. long cylinder head screws inserted in the provided
holes. Recommended minimum bend radius of the cable: R 25 mm. Install
the sensor and the magnetic scale as shown in the Figure. The system does not
operate if mounted otherwise than illustrated in the Figure. The arrow is
intended to indicate the standard counting direction (count up information).
Please note that the MTAX magnetic scale can be provided with a cover strip to
protect its magnetic surface (see the order code). Therefore the distance
between the sensor and the magnetic scale is different whether the cover strip
is applied.
The distance D (see Figure 2) between the centre of the screw fixing
holes and the MTAX magnetic scale has to be as follows:
without cover strip with cover strip
31.7 mm 33.2 mm (1.248” 1.307”) 31.3 mm 32.8 mm (1.232” 1.291”)
For better operation the suggested distance D is 32.2 mm (1.267”).
MAN SMAX SSI_AI1_AV2 E 1.5.odt 3 - Mounting instructions 10 of 32
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