Lika SMRI2, SMRI5 User Manual
User's guide
SMRI2
SMRI5
• Magnetic modular encoder with incremental output
• For 2-mm (SMRI2) or 5-mm (SMRI5) pole pitch rings
• Resolutions up to 180,000 PPR
• Ring diameters for shafts up to 250 mm
• IP67 (standard) / IP69K protection rate
• Cable or M12 connector output
Suitable for the following models:
• SMRI2-... + MRI/...-2-...
• SMRI5-... + MRI/...-5-...
Table of Contents
Preliminary information 5
1 - Safety summary 6
2 - Identification 8
3 - Mechanical installation 9
4 - Electrical connection 16
5 - Maintenance and troubleshooting 24
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
derechos reservados. Tous droits réservés.
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 ring combination...........................................................................................................................10
3.3 Mounting instructions.........................................................................................................................................10
3.4 Mounting the magnetic ring.............................................................................................................................11
3.5 Mounting the sensor............................................................................................................................................12
3.6 Mounting tolerances............................................................................................................................................14
3.7 Standard counting direction.............................................................................................................................15
4 Electrical connection.......................................................................................................................... 16
4.1 Cable and connector connections..................................................................................................................16
4.2 M8 cable specifications.......................................................................................................................................17
4.3 M12 8-pin connector specifications.............................................................................................................17
4.4 Connection of the shield....................................................................................................................................18
4.5 Ground connection...............................................................................................................................................18
4.6 AB0, /AB0 output channels...............................................................................................................................19
4.7 Counting direction................................................................................................................................................21
4.8 Reference “R”...........................................................................................................................................................21
4.9 Diagnostic LEDs (Figure 8).................................................................................................................................22
4.10 Recommended circuit.......................................................................................................................................23
5 Maintenance and troubleshooting................................................................................................. 24
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 following incremental magnetic modular encoders: SMRI2
and SMRI5.
SMRI2 and SMRI5 modular encoders are designed to measure linear or angular displacements on
industrial machines and automation systems. The measurement system includes a magnetic ring,
conversion electronics and a magnetic sensor.
The ring has alternating magnetic north/south poles that are magnetized at a fixed distance called the
pole pitch (see Figure 7). The pole pitch is 2 mm for SMRI2; it is 5 mm for SMRI5. The conversion
electronics inside the sensor translates the magnetic fields of the ring into electrical signals equivalent to
those of an incremental encoder or a linear scale. The readhead must be paired with the appropriated
magnetic ring: MRI/...-2-... for SMRI2; MRI/...-5-... for SMRI5; see also the “3.2 Sensor and ring
combination” section on page 10.
The measuring system can include specific sensor and ring with additional magnetic track for the
transmission of a Reference signal.
Please note that:
• encoders having order code SMRIx-xx-x-xxx-R-... are equipped with Reference sensor;
• rings having order code MRI/xxxZ-... have the Reference track;
• encoders having order code SMRIx-xx-x-xxx-N-... are not equipped with Reference sensor;
• rings having order code MRI/xxx-... have not the Reference track.
SMRI2 • SMRI5
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 16;
• 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 SMRI2_SMRI5 E 1.4 Safety summary 6 of 28
SMRI2 • SMRI5
- minimize noise by connecting the cable shield (or the connector housing)
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 jets of
compressed air) are in place in order to prevent the sensor and the
magnetic ring from jamming.
CAUTION
Keep magnets away from the ring, it could be damaged by strong magnetic
fields.
MAN SMRI2_SMRI5 E 1.4 Safety summary 7 of 28
SMRI2 • SMRI5
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 SMRI2_SMRI5 E 1.4 Identification 8 of 28
SMRI2 • SMRI5
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)
Figure 1 - Encumbrance sizes
A Reference sensor “R” (page 21) C Incremental sensor
B Diagnostic LEDs (page 22)
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 9 of 28
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