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
SMRI2 • SMRI5
3.2 Sensor and ring combination
The sensor has to be compulsorily paired with its specific type of magnetic ring
as indicated in the table below.
Sensor MRI ring
SMRI2-xx-x-xxx-N-... MRI/xxx-xxx-2-...
SMRI2-xx-x-xxx-R-... MRI/xxxZ-xxx-2-...
SMRI5-xx-x-xxx-N-... MRI/xxx-xxx-5-...
SMRI5-xx-x-xxx-R-... MRI/xxxZ-xxx-5-...
3.3 Mounting instructions
Protect the device against knocks, frictions, solvents as well as under and over
temperatures. Please never stretch the cable. Do not pull or carry by cable. Do
not use the cable as a handle. 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 jets of compressed air) are in place in order to prevent the
sensor and the magnetic ring from jamming.
SMRI encoder must be compulsorily paired with MRI rings as stated in the
previous section. See the order code of the rings: for example MRI/xxx-xx-2-xxx
must be paired with SMRI2 encoder.
Make sure that the mechanical installation always complies with the system
requirements for distance, planarity and parallelism between the readhead and
the ring indicated in Figure 4, Figure 5 and Figure 6. Avoid any contact between
the readhead and the ring.
If the Reference “R” signals are not provided (encoders having order code
SMRIx-xx-x-xxx-N-... and rings having order code MRI/xxx-...) the readhead can
be mounted over the ring as desired (both directions are allowed). If required,
please only be careful that the sensor is properly aligned on the correct side of
the ring (see Figure 5).
If the Reference “R” signals are provided (encoders having order code SMRIx-xxx-xxx-R-... and rings having order code MRI/xxxZ-...) the readhead and the ring
must be compulsorily installed as shown in Figure 4. For further information
please refer to the “3.5 Mounting the sensor” section on page 12.
The arrow in Figure 4 indicates the standard counting direction (the rising
edge of A signal leads the rising edge of B signal) when the ring turns in the
direction indicated by the arrow; further information in the “4.7 Counting
direction” section on page 21.
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 10 of 28
SMRI2 • SMRI5
3.4 Mounting the magnetic ring
Several types of MRI magnetic rings featuring different mechanical
characteristics and mounting options are available. The rings can be fixed to the
motor shaft by means of grub screws (Figure 2) or screws (Figure 3).
For technical features and dimensions of the rings please refer to the product
datasheet.
Figure 2 - Mounting MRI rings with grub screws
Figure 3 - Mounting MRI rings with screws
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 11 of 28
SMRI2 • SMRI5
The mark punched in the frame of the ring (see Figure 4) shows the side where
the Reference track is coded. It further indicates the point when the Reference
signal is transmitted. Please note that the punch mark may be provided also in
the rings that do not have the Reference track.
CAUTION
Keep magnets away from the ring, it could be damaged by strong magnetic
fields.
3.5 Mounting the sensor
Figure 4 - Mounting the encoder / ring
Make sure that the mechanical installation complies with the system
requirements concerning distance, planarity and parallelism between the sensor
and the ring as indicated in the “3.6 Mounting tolerances” section on page 14.
Avoid any contact between the readhead and the ring.
Fix the sensor by means of two M3 15 mm / 0.6” min. long cylinder head
screws inserted in the provided holes.
The recommended tightening torque is 1.1 Nm.
The recommended minimum bend radius of the cable is: R 42 mm.
Install the sensor and the magnetic ring as shown in the Figure. As previously
stated, the arrow is intended to indicate the standard counting direction (the
rising edge of A signal leads the rising edge of B signal).
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 12 of 28
SMRI2 • SMRI5
The distance D (see Figure 4) between the bottom of the readhead and
the MRI magnetic ring must be as follows:
Sensor
Distance D between sensor / ring
without Reference with Reference
SMRI2
0.1 mm 1.0 mm
0.004” 0.039”
0.1 mm 0.7 mm
0.004” 0.027”
SMRI5
0.1 mm 2.0 mm
0.004” 0.078”
0.1 mm 1.5 mm
0.004” 0.059”
For better operation we suggest the following distance D:
Sensor Recommended distance D between sensor and ring
SMRI2
0.5 mm / 0.019”
SMRI5
1.0 mm / 0.039”
WARNING
When the “R” Reference signal is available (encoders having order code SMRIxxx-x-xxx-R-... and rings having order code MRI/xxxZ-...) please pay attention to
the mounting side of the magnetic ring: there is the incremental track on one
side and the Reference track on the other side. The mark punched in the frame
of the ring shows the side where the Reference track is coded. It further
indicates the point when the Reference signal is transmitted. See Figure 4.
WARNING
When the sensor is installed on magnetic rings having a 10 mm / 0.4” wide
magnetic surface, line up both the sensor and the ring on the central axis; as
previously stated, if the Reference track is provided pay attention to the
mounting direction of the sensor and the ring.
When magnetic rings having a 5 mm / 0.2” wide magnetic surface are used, line
up the sensor and the ring as shown in Figure 5; please consider that the
incremental sensor is located laterally in the sensing head (see Figure 1). With 5
mm rings the mounting direction of the ring makes no difference (but be sure
that the sensor is properly aligned on the correct side!).
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 13 of 28
SMRI2 • SMRI5
Figure 5 - Alignment of the readhead / ring
3.6 Mounting tolerances
Always comply with the mounting tolerances indicated in Figure 4, Figure 5 and
Figure 6. Make sure that the mechanical installation complies with the system
requirements concerning distance, planarity and parallelism between the sensor
and the ring.
Figure 6 - Mounting tolerances of the readhead / ring
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 14 of 28
SMRI2 • SMRI5
3.7 Standard counting direction
The positive counting direction (the rising edge of A signal leads the rising edge
of B signal) is achieved when the ring turns according to the arrow shown in
Figure 4. For further information see the “4.7 Counting direction” section on
page 21.
MAN SMRI2_SMRI5 E 1.4 Mechanical installation 15 of 28
SMRI2 • SMRI5
4 Electrical connection
WARNING
Electrical connection must be carried out by qualified personnel only, with
power supply disconnected and mechanical parts compulsorily in stop.
WARNING
If wires of unused signals come in contact, irreparable damage could be caused
to the device. Thus they must be cut at different lengths and insulated
singularly.
4.1 Cable and connector connections
Function M8 cable M12 8-pin
0Vdc
Black 1
+Vdc
1
Red 2
A
Yellow 3
/A
Blue 4
B
Green 5
/B
Orange 6
0
2
White 7
/0
2
Grey 8
Shield
Shield Case
1 See the order code for power supply voltage level
EXAMPLE
SMRI2-L-1-... +Vdc = +5Vdc ± 5%
SMRI5-YC-2-... +Vdc = +10Vdc +30Vdc
2 Reference signals (see the “4.8 Reference “R”“ section on page 21) are only
available with encoders having order code SMRIx-xx-x-xxx-R-... and rings
having order code MRI/xxxZ-... . With encoders having order code SMRIx-xx-
x-xxx-N-... and rings having order code MRI/xxx-... the signals are not
provided.
MAN SMRI2_SMRI5 E 1.4 Electrical connection 16 of 28
SMRI2 • SMRI5
NOTE
All sensors can provide inverted signals.
A = A signal;
/A = inverted A signal (or complementary signal).
All Lika's magnetic encoders can provide AB0, /AB0 output signals. You are
advised to always connect the inverted signals if the receiving device will accept
them. Otherwise each output should be insulated singularly.
4.2 M8 cable specifications
Model: LIKA HI-FLEX sensor cable type M8
Cross section: 2 x 0.22 mm2 + 6 x 0.14 mm2 (24/26 AWG)
Jacket: Matt Polyurethane (TPU) halogen free, oil, hydrolysis,
abrasion resistant
Shield: Tinned copper braid, coverage > 85%
Outer diameter: 5.3 ÷ 5.6 mm (0.209” ÷ 0.220”)
Min. bending radius: outer diameter x 7.5
Work temperature: dynamic -40°C +90°C (-40°F +194°F) / fixed -50°C
+90°C (-58°F +194°F)
Conductor resistance:
<90 /Km (0.22 mm2), <148 /Km (0.14 mm2)
The total length of the cable that connects the sensor and the receiving device
should not exceed the values stated in the “Cable lengths” section of the rotary
encoders' catalogue; they are specific for each type of output circuit. If you need
to reach greater distances please contact Lika Electronic Technical Dept.
Do not bend the cable excessively; the min. bending radius is Ø x 7.5 at a
minimum distance of 10 mm from the sensor head.
4.3 M12 8-pin connector specifications
Male
Frontal side
A coding
MAN SMRI2_SMRI5 E 1.4 Electrical connection 17 of 28
SMRI2 • SMRI5
4.4 Connection of the shield
For signals transmission always use shielded cables. The cable shielding must be
connected properly to the metal ring nut 3 of the connector in order to ensure
a good earthing through the frame of the device. To do this disentangle and
shorten the shielding 1 and then bend it over the part 2; finally place the ring
nut 3 of the connector. Be sure that the shielding 1 is in tight contact with the
ring nut 3.
4.5 Ground connection
Minimize noise by connecting the cable shield (or the connector housing) and
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 side and on the
user’s side. The best solution to minimize the interference must be carried out by
the user. You are advised to provide the ground connection as close as possible
to the encoder.
MAN SMRI2_SMRI5 E 1.4 Electrical connection 18 of 28
SMRI2 • SMRI5
4.6 AB0, /AB0 output channels
Figure 7 - Example with interpolation factor x4
The conversion electronics inside the sensor translates the magnetic fields of the
ring into electrical signals equivalent to those of an incremental encoder or
similar incremental optical devices.
The frequency of the output signal is proportional to the measuring speed and
the rotational speed of the ring.
Please note that the “R” Reference signal (0, /0) is provided once per revolution
of the magnetic ring (see the “4.8 Reference “R”” section on page 21).
In the order code of the encoder you can find information about the
interpolation factor.
EXAMPLE
SMRI2-L-1-1000-N-...: interpolation factor = 1000.
MAN SMRI2_SMRI5 E 1.4 Electrical connection 19 of 28
SMRI2 • SMRI5
The interpolation factor is useful to calculate the number of encoder PPRs
(pulses per revolution).
You need to know also the number of poles of the magnetic ring, the
information can be found in the order code of the magnetic ring.
EXAMPLE
MRI/114-182-2-100: number of poles = 182.
The number of encoder PPRs results from the following calculation:
interpolation factor * number of ring poles
EXAMPLE
As in the previous examples, let's suppose we are using the SMRI2-L-1-1000N-... encoder paired with the MRI/114-182-2-100 magnetic ring where 182 is
the number of ring poles. As you can see in the order code, the interpolation
factor is x1000. We have to calculate the number of edges per revolution
(intended after multiplying by 4) first.
The number of edges per revolution results from:
interpolation factor * number of ring poles
So, in our example we will get:
1000 * 182 = 182,000 edges per revolution
Encoder PPRs result from the following calculation:
Encoder PPRs =
Edges/revolution
=
182,000
= 45,500 PPR
4 4
WARNING
The position value issued by the sensor is expressed in pulses; to convert the
pulses into a metric measuring unit (useful, for instance, for knowing the
position of a linear axis controlled through the encoder) you must multiply the
number of detected pulses by the linear resolution expressed in millimetres or
micrometres.
MAN SMRI2_SMRI5 E 1.4 Electrical connection 20 of 28
SMRI2 • SMRI5
We know the interpolation factor of the encoder, so we can calculate the linear
resolution expressed in millimetres or micrometres.
It results from the following formula:
pitch of the ring pole / interpolation factor
The pole pitch is 2 mm for SMRI2 + MRI/...-2-...; it is 5 mm for SMRI5 + MRI/...-
5-... .
In our example it will be as follows:
2 / 1000 = 0.002 mm = 2 µm
EXAMPLE
SMRI2-L-1-1000-N-... encoder
MRI/114-182-2-100 magnetic ring
resolution = 2 µm = 0.002 mm
detected pulses = 2,866
position value = 2,866 * 2 = 5,732 µm = 5.732 mm
4.7 Counting direction
The phase relationship between A and B channels is so that the rising edge of A
channel leads the rising edge of B channel when the ring turns in the direction
shown by the arrow in Figure 4. See also the previous “4.6 AB0, /AB0 output
channels” section on page 19. Thus the counter in the subsequent electronics
will get a count up. The counting direction cannot be changed.
4.8 Reference “R”
Reference signals (0, /0) are available in the encoders having order code SMRIx-
xx-x-xxx-R-... and rings having order code MRI/xxxZ-... . In the encoders having
order code SMRIx-xx-x-xxx-N-... and rings having order code MRI/xxx-... the
Reference signals are not available.
They provide a univocal position information once per revolution of the
magnetic ring for use at power-on or following a loss of power. In the
measuring systems equipped with Reference sensor the “R” LED (see the “4.9
Diagnostic LEDs (Figure 8)” section) lights up when the Reference signal is
transmitted. The Reference signal has a duration of one measuring step (90
electrical degrees ± 30°) and an amplitude according to the power supply
voltage level.
MAN SMRI2_SMRI5 E 1.4 Electrical connection 21 of 28
SMRI2 • SMRI5
NOTE
The Reference track can be available only in the magnetic rings having a 10
mm / 0.4” wide magnetic surface. Magnetic rings having a 5 mm / 0.2” wide
magnetic surface cannot have the Reference track.
4.9 Diagnostic LEDs (Figure 8)
Two LEDs located in the upper face of the encoder enclosure are intended to
show visually the work status of the device as explained in the following table.
Figure 8 - Diagnostic LEDs and optional cleaning wipers
E RED LED
(error status)
Description
ON
Red
It warns of the presence of an error.
• Distance error: the specified mounting
tolerances between the sensor and the ring
are not met; please refer to the “Mechanical
installation” section on page 9.
• Speed / frequency error: overspeed detected,
the rotational speed of the ring is too high.
OFF No error is active currently.
R GREEN LED
(Reference)
Description
ON
Green
• Sensors with Reference (“-R-” order code):
Reference signal transmitted, zero signal (see
Figure 7). The same as the high logic level of
the 0 output signal. Refer to the “4.8
Reference “R”” section on page 21.
• Sensors without Reference (“-N-” order
code): the encoder is supplied.
OFF
• Sensors with Reference (“-R-” order code): no
Reference signal.
• Sensors without Reference (“-N-” order
code): the encoder is not supplied.
MAN SMRI2_SMRI5 E 1.4 Electrical connection 22 of 28
SMRI2 • SMRI5
4.10 Recommended circuit
Push-Pull (Y order code)
Push-Pull (YC order code)
Line Driver (L order code)
MAN SMRI2_SMRI5 E 1.4 Electrical connection 23 of 28
SMRI2 • SMRI5
5 Maintenance and troubleshooting
The magnetic measurement system does not need any particular maintenance;
please always consider it is a delicate electronic equipment and therefore it
must be handled with care. From time to time we recommend the following
operations:
• Check the mounting tolerances between the sensor and the magnetic
ring are always met. Wear of the machine may increase the tolerances.
• The surface of the magnetic ring should be cleaned periodically using a
soft cloth to remove dust, chips, moisture etc.
The following list shows some typical faults and errors that may occur during
installation and operation of the magnetic measurement system. Refer also to
the “4.9 Diagnostic LEDs (Figure 8)” section on page 22.
Fault:
The system does not work (no pulse output).
Possible cause:
• The ring or the sensor has been mounted incorrectly.
• A magnetic piece or an inappropriate strip is in between the sensor and
the ring. Only non-magnetic materials are allowed between the sensor
and the ring.
• The sensor touches the ring: the mounting tolerances are not met.
Check if the active side of the sensor is damaged.
• The sensor has been damaged by a short circuit or a wrong connection.
Fault:
The measured values are inaccurate.
Possible cause:
• The mounting tolerances between the sensor and the ring are not
always met.
• The connection cable runs near to high voltage cable or shield is not
connected correctly. See the “4 -Electrical connection“ section on page
16.
• The presence of external noise may cause malfunctioning or a decrease
in the quality of the signals.
• The max. counting frequency of your receiving device is too low.
• A section of the magnetic ring has been damaged mechanically or
magnetically.
MAN SMRI2_SMRI5 E 1.4 Maintenance and troubleshooting 24 of 28
SMRI2 • SMRI5
• The measuring error is caused by torsion of the machine structure.
Check parallelism and symmetry of machine movement.
MAN SMRI2_SMRI5 E 1.4 Maintenance and troubleshooting 25 of 28
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Document release Release date Description HW SW Interface
1.0 07.08.2013 First issue - - -
1.1 07.11.2013 New web links - - -
1.2 30.07.2014 Information about Reference - - -
1.3 12.09.2014 Mounting instructions updated, general review - - -
1.4 20.12.2018
General review, SMRI2/SMRI5 manuals merged,
separate Italian and English versions
- - -
Lika Electronic
Via S. Lorenzo, 25 • 36010 Carrè (VI) • Italy
Tel. +39 0445 806600
Fax +39 0445 806699
info@lika.biz • www.lika.biz
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