Lika SFAS1-01000-BA2 Series User manual

User's guide
SFAS1-01000
SFAS1-02000
Miniature absolute draw-wire encoder
•Absolute draw-wire encoder with SSI interface
•Robust and com act design
•Resolution from 0.1 mm to 0.012 mm
•Max. measuring length: 1000 mm or 2000 mm
•Cable and M12 connector out uts
Suitable for the following models:
•SFAS1-01000-BA2-...
•SFAS1-01000-GA2-...
•SFAS1-02000-BA2-...
•SFAS1-02000-GA2-...
General Contents
Preliminary information 5
Safety summary 6
Identification 8
Mechanical installation 9
Electrical connection 13
SSI interface 17
Lika Electronic • Tel. [phone] • [email protected] • www.lika.biz
Smart encoders & actuators

This publication was produced by Lika Electronic s.r.l. 2023. All rights reserved. Tutti i diritti riservati. Alle Rechte vorbehalten. Todos los
derechos reservados. Tous droits réservés.
This docu ent and infor ation 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 odification (photostat copies,
fil and icrofil included and any other eans) are forbidden without written authorisation of Lika Electronic s.r.l.
The infor ation herein is subject to change without notice and should not be construed as a co it ent by Lika Electronic s.r.l. Lika
Electronic s.r.l. reserves the right to ake all odifications at any o ents and without forewarning.
This anual is periodically reviewed and revised. As required we suggest checking if a new or updated edition of this docu ent is
available at Lika Electronic s.r.l.'s website. Lika Electronic s.r.l. assu es no responsibility for any errors or o issions in this docu ent.
Critical evaluation of this anual by the user is welco ed. Your co ents assist us in preparation of future docu entation, in order
to ake it as clear and co plete as possible. Please send an e- ail to the following address [email protected] for sub itting your
co ents, suggestions and criticis s.

Table of contents
User's guide............................................................................................................................................................................................1
Table of contents.............................................................................................................................................................................3
Ty ogra hic and iconogra hic 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 di ensions...................................................................................................................................................9
3.2 Mounting instructions.........................................................................................................................................10
3.3 Useful infor ation................................................................................................................................................11
3.4 Maintenance............................................................................................................................................................12
4 Electrical connection.......................................................................................................................... 13
4.1 Cable and connectors connections................................................................................................................13
4.2 M8 cable specifications.......................................................................................................................................13
4.3 M12 8-pin connector specifications.............................................................................................................14
4.4 Connection of the shield....................................................................................................................................14
4.5 Ground connection...............................................................................................................................................14
4.6 Zero setting input..................................................................................................................................................15
4.7 Counting direction input....................................................................................................................................16
5 SSI interface........................................................................................................................................ 17
5.1 SSI (Synchronous Serial Interface).................................................................................................................17
5.2 “LSB Right Aligned” protocol............................................................................................................................18
5.3 Reco ended trans ission rates.................................................................................................................21
5.4 Max. speed and counting frequency.............................................................................................................22
5.5 Reco ended SSI circuit..................................................................................................................................23

Ty ogra hic and iconogra hic conventions
In this guide, to ake it easier to understand and read the text the following typographic and
iconographic conventions are used:
•para eters are coloured in GREEN;
•alar s are coloured in RED;
•states are coloured in FUCSIA.
So e icons in the pages are expressly designed to highlight the parts of the text which are of great
interest and significance for the user. So eti es they are used to warn against dangers or potential
sources of danger arising fro 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 perfor ance of the device.
In this guide the following sy bols are used:
This icon, followed by the word WARNING, is eant to highlight the parts of the
text where infor ation of great significance for the user can be found: user ust
pay the greatest attention to the ! Instructions ust 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 co ply with instructions could lead to personal injury and/or da age
to the unit or other equip ent.
This icon, followed by the word NOTE, is eant to highlight the parts of the text
where i portant notes needful for a correct and reliable use of the device can be
found. User ust pay attention to the ! Failure to co ply with instructions could
cause the equip ent to be set wrongly: hence a faulty and i proper working of
the device could be the consequence.
This icon is eant to highlight the parts of the text where suggestions useful for
aking it easier to set the device and opti ize perfor ance and reliability can be
found. So eti es this sy bol is followed by the word EXAMPLE when instructions
for setting para eters are acco panied by exa ples to clarify the explanation.

Preliminary information
This guide is designed to provide the ost co plete and exhaustive infor ation the operator needs to
correctly and safely install and operate the SFAS1-01000 and SFAS1-02000 absolute draw-wire
encoders.
SFAS1-01000/SFAS1-02000 cable-pulling encoder is ai ed at speed and position easure ents and
controls in a variety of industrial applications through the ove ent of a 1,000 mm (39.37”) or 2,000
mm (78.74”) stainless steel wire. The typical back and forth travel of the oving equip ent causes the
wire to reel and unreel and thus the linear ove ent to be converted into a rotative otion detected by
the encoder which is coupled to the dru .
SFAS1-01000/SFAS1-02000 provides the absolute position infor ation through the “LSB Right Aligned”
protocol SSI interface.
To ake it easier to read and understand the text, this guide is divided into two ain sections.
In the first section so e general infor ation concerning the safety, the echanical installation and the
electrical connection as well as tips for setting up and running properly and efficiently the SFAS1-
01000/SFAS1-02000 cable-actuated encoder are provided.
In the second section, entitled SSI Interface, you can find detailed infor ation on the SSI interface.

SFAS1-01000 • SFAS1-02000
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 aintenance operations have to be carried out by
qualified personnel only, with power supply disconnected and stationary
echanical parts;
•device ust 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 environ ent da age;
•high current, voltage and oving echanical parts can cause serious or
fatal injury;
•warning ! Do not use in explosive or fla able areas;
•failure to co ply with these precautions or with specific warnings
elsewhere in this anual violates safety standards of design, anufacture,
and intended use of the equip ent;
•Lika Electronic assu es no liability for the custo er's failure to co ply
with these require ents.
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 13;
•connect Zero setting input to 0Vdc, if not used; to zero set the encoder,
connect Zero setting to +Vdc for 100 µs at least, then disconnect +Vdc;
nor ally voltage ust be at 0Vdc; zero set ust be perfor ed after
Counting direction; we suggest perfor ing the zero set when the encoder
is in stop;
•connect Counting direction input to 0Vdc, if not used; to have count up
infor ation when pulling the wire out = connect the input to 0Vdc; to
have count up infor ation when rewinding the wire = connect to +Vdc;
•in co pliance with 2014/30/EU nor on electro agnetic
co patibility, following precautions ust be taken:
-before handling and installing the equip ent, discharge
electrical charge fro your body and tools which ay co e in touch
with the device;
- power supply ust be stabilized without noise; install EMC filters on
device power supply if needed;
MAN SFAS1_01000_02000 SSI E 1.3 Safety su ary 6 of 24

SFAS1-01000 • SFAS1-02000
- 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;
- ount the device as far as possible fro any capacitive or inductive
noise source; shield the device fro noise source if needed;
- to guarantee a correct working of the device, avoid using strong agnets
on or near by the unit;
- ini ize noise by connecting the shield and/or the connector housing
and/or the fra e 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 ini ize the interference
ust be carried out by the user.
1.3 Mechanical safety
•Install the device following strictly the infor ation in the “Mechanical
installation” section on page 9;
•echanical installation has to be carried out with stationary echanical
parts;
•do not disasse ble the unit;
•do not tool the unit;
•delicate electronic equip ent: handle with care; do not subject the device
to knocks or shocks;
•respect the environ ental characteristics of the product;
•we suggest installing the unit providing protection eans against waste,
especially swarf as turnings, chips, or filings; should this not be possible,
please ake sure that adequate cleaning easures are in place in order to
prevent the wire fro ja ing;
•to avoid failures, never exceed the axi u easuring length and
prevent the wire fro tangling up;
•never release the wire freely, always help the wire wind properly: risk of
personal injury and/or equip ent da age;
•always keep the wire aligned not to da age the equip ent;
•the stroke per turn of the draw-wire unit is 100 (3.937”).
MAN SFAS1_01000_02000 SSI E 1.3 Safety su ary 7 of 24

SFAS1-01000 • SFAS1-02000
2 Identification
Device can be identified through the order code and the serial number printed
on the label applied to its body. Infor ation is listed in the delivery docu ent
too. Please always quote the order code and the serial nu ber when reaching
Lika Electronic. For any infor ation on the technical characteristics of the
product refer to the technical catalogue.
Warning: encoders having order code ending with "/Sxxx" ay have
echanical and electrical characteristics different fro standard and
be supplied with additional docu entation for special connections
(Technical Info).
MAN SFAS1_01000_02000 SSI E 1.3 Identification 8 of 24

SFAS1-01000 • SFAS1-02000
3 Mechanical installation
WARNING
Installation has to be carried out by qualified personnel only, with power supply
disconnected and echanical parts co pulsorily in stop.
3.1 Overall dimensions
Values are expressed in
MAN SFAS1_01000_02000 SSI E 1.3 Mechanical installation 9 of 24

SFAS1-01000 • SFAS1-02000
3.2 Mounting instructions
•Fasten the draw-wire unit onto a fixed support using two M3 screws 1;
•re ove the transport safety wire that pins the end of the easuring
wire;
•fix the end of the easuring wire to the oving ele ent using the
provided M6 nuts 2.
WARNING
We suggest installing the unit providing protection eans against waste,
especially swarf as turnings, chips, or filings; should this not be possible, please
ake sure that adequate cleaning easures are in place in order to prevent the
wire fro ja ing.
To avoid irreparable failures, never exceed the axi u easuring length and
prevent the wire fro tangling up.
Never release the wire freely, always help the wire wind properly: risk of personal
injury and/or equip ent da age.
MAN SFAS1_01000_02000 SSI E 1.3 Mechanical installation 10 of 24