Linear Servo Actuator
LSA Series
Large Type
Operating Manual
Third Edition
Large Types
LSA-W21SS, LSA-W21SM
LSA-W21HS, LSA-W21HM
IAI America, Inc.
Precaution on Installation of Linear Servo Actuator
The linear servo actuator shall be installed according to the following table as a general rule. Please
exercise care at installation (except for specially ordered products).
: Can be installed
X: Cannot be installed
Model number
S6
Horizontal installation
of flat surface
Vertical installation Installation on side Ceiling mount
X
X
S8
S10
H8
L15
N10
N15
N19
W21
X
X
X
X X X
X X X
X X X
X X X
X X X
X
X
X
Table of Contents
Safety Guide.......................................................................................... Pre-1
1. Foreword..................................................................................................1
2. Safety Precautions...................................................................................1
2.1 Basic Handling ................................................................................................................1
Maintenance and Inspection ........................................................................................... 1
2.2
2.3 Permanent Magnets........................................................................................................1
3. Warranty...................................................................................................2
3.1 Warranty Period...............................................................................................................2
3.2 Scope of Warranty........................................................................................................... 2
4. Name of Each Part...................................................................................3
5. Transportation and Handling....................................................................4
5.1 Handling the Actuator by Itself.........................................................................................4
5.1.1 Handling the Packed Actuator............................................................................4
5.1.2 Handling the Unpacked Actuator .......................................................................4
5.2 Handling the Actuator Assembly......................................................................................5
5.2.1 Condition of Shipment from IAI (Assembled).....................................................5
5.2.2 Handling after Assembly with Peripheral Equipment......................................... 5
6. Installation, Storage/Preservation Environment.......................................6
6.1 Operating Environment ................................................................................................... 6
6.2 Storage/Preservation Environment..................................................................................6
7. Installation................................................................................................7
7.1 Installing the Actuator......................................................................................................8
7.1.1 Affixing the Actuator on the Top Side of the Base.............................................. 8
7.1.2 Affixing the Actuator on the Bottom Side of the Base........................................ 9
7.2 Installation Surface........................................................................................................10
7.3 Tightening Screws......................................................................................................... 11
7.4 Installing a Connector Box Using T-slots....................................................................... 11
7.5 Installing a Load on the Slider.......................................................................................12
8. Wiring of the Cables...............................................................................13
9. Precautions for Use................................................................................14
9.1 Actuator Load................................................................................................................14
9.2 Home Return.................................................................................................................15
9.2.1 Operating Principles of Home Return..............................................................15
9.2.2 Fine-tuning the Home Position.........................................................................15
9.2.3 Changing the Home Direction.......................................................................... 15
9.3 Stainless Sheet..............................................................................................................16
9.4 Slider Cover................................................................................................................... 16
10. Selection Conditions.............................................................................17
10.1 Selection Method...........................................................................................................18
10.2 Example ........................................................................................................................20
11. Maintenance and Inspection.................................................................22
11.1 Inspection Items and Schedule..................................................................................... 22
11.2 Visually Inspecting the Exterior..................................................................................... 22
11.3 Cleaning the Exterior.....................................................................................................22
11.4 Inspecting the Interior....................................................................................................23
11.5 Cleaning the Interior...................................................................................................... 23
11.6 Greasing the Guide....................................................................................................... 24
11.6.1 Applicable Grease............................................................................................24
11.6.2 How to Add Grease..........................................................................................25
12. Troubleshooting.................................................................................... 26
12.1 What to Do When You Suspect a Failure......................................................................26
13. Replacement/Adjustment of Stainless Sheet........................................29
13.1 Replacement Procedure for Stainless Sheet.................................................................30
13.2 Adjusting the Stainless Sheet Tension...........................................................................31
14. Linear Scale Cleaning Procedure.........................................................33
15. Specifications .......................................................................................42
15.1 Actuator.........................................................................................................................42
15.2 Cable Wiring Diagram ...................................................................................................43
15.3 External Dimension Drawing......................................................................................... 44
15.3.1 W21SS............................................................................................................. 44
15.3.2 W21SM............................................................................................................46
15.3.3 W21HS ............................................................................................................ 48
15.3.4 W21HM............................................................................................................50
Safety Guide
When designing and manufacturing a robot system, ensure safety by following the safety guides
provided below and taking the necessary measures.
Regulations and Standards Governing Industrial Robots
Safety measures on mechanical devices are generally classified into four categori es un der the
International Industrial Standard ISO/DIS 12100, “Safety of machinery,” as follows:
Safety measures Inherent safety design
Protective guards --- Safety fence, etc.
Additional safety measures --- Emergency stop device, etc.
Information on use --- Danger sign, warnings, operation manual
Based on this classification, various standards are established in a hierarchical manner under the
International Standards ISO/IEC. The safety standards that apply to industrial robots are as follows:
Type C standards (individual safety standards) ISO10218 (Manipulating industrial robots – Safety)
JIS B 8433
(Manipulating industrial robots – Safety)
Also, Japanese laws regulate the safety of industrial robots, as follows:
Industrial Safety and Health Law Article 59
Workers engaged in dangerous or harmful operations must receive special education.
Ordinance on Industrial Safety and Health
Article 36 --- Operations requiring special education
No. 31 (Teaching, etc.) --- Teaching and other similar work involving industrial robots
(exceptions apply)
No. 32 (Inspection, etc.) --- Inspection, repair, adjustment and similar work involving industrial
robots (exceptions apply)
Article 150 --- Measures to be taken by the user of an industrial robot
Pre-1
Requirements for Industrial Robots under Ordinance on Industrial
Safety and Health
Work area Work condition Cutoff of drive source Measure Article
Outside
movement
range
Inside
movement
range
During
automatic
operation
During
teaching, etc.
During
inspection, etc.
Not cut off
Cut off (including
stopping of
operation)
Not cut off
Cut off
Not cut off (when
inspection, etc., must
be performed during
operation)
Signs for starting operation Article 104
Installation of railings,
enclosures, etc.
Sign, etc., indicating that work is
in progress
Preparation of work rules Article 150-3
Measures to enable immediate
stopping of operation
Sign, etc., indicating that work is
in progress
Provision of special education Article 36-31
Checkup, etc., before
commencement of work
To be performed after stopping
the operation
Sign, etc., indicating that work is
in progress
Preparation of work rules Article 150-5
Measures to enable immediate
stopping of operation
Sign, etc., indicating that work is
in progress
Provision of special education
(excluding cleaning and
lubrication)
Article 150-4
Article 150-3
Article 150-3
Article 150-3
Article 151
Article 150-5
Article 150-5
Article 150-5
Article 150-5
Article 36-32
Pre-2
Applicable Models of IAI’s Industrial Robots
Machines meeting the following conditions are not classified as industrial robots according to Notice of
Ministry of Labor No. 51 and Notice of Ministry of Labor/Labor Standards Office Director (Ki-Hatsu No.
340):
(1) Single-axis robot with a motor wattage of 80 W or less
(2) Combined multi-axis robot whose X, Y and Z-axes are 300 mm or shorter and whose rotating
part, if any, has the maximum movement range of within 300 mm
rotating part
(3) Multi-joint robot whose movable radius and Z-axis are within 300 mm
Among the products featured in our catalogs, the following models are classified as industrial robots:
1. Single-axis ROBO Cylinders
RCS2/RCS2CR-SS8 and RCS3/RCS3CR/RCS3P/RCS3PCR whose stroke e xceeds 300 mm
2. Single-axis robots
The following models whose stroke exceeds 300 mm and whose motor capacity also exceeds 80 W:
ISA/ISPA, ISDA/ISPDA, ISWA/ISPWA, IF, FS, NS
3. Linear servo actuators
All models whose stroke exceeds 300 mm
4. Cartesian robots
Any robot that uses at least one axis corresponding to one of the models specified in 1 to 3
5. IX SCARA robots
All models whose arm length exceeds 300 mm
(All models excluding IX-NNN1205/1505/1805/2515, NNW2515 and NNC1 205/1505/1805/2515)
3
including the end of the
Pre-3
Notes on Safety of Our Products
Common items you should note when performing each task on any IAI robot are explained below.
No. Task Note
1 Model
selection
2 Transportation When transporting the product, exercise due caution not to bump or drop the
3 Storage/
preservation
4 Installation/
startup
This product is not planned or designed for uses requiring high degrees of safety.
Accordingly, it cannot be used to sustain or support life and must not be used in
the following applications:
[1] Medical devices relating to maintenance, management, etc., of life or health
[2] Mechanisms or mechanical devices (vehicles, railway facilities, aircraft facilities,
etc.) intended to move or transport people
[3] Important safety parts in mechanical devices (safety devices, etc.)
Do not use this product in the following environments:
[1] Place subject to flammable gases, ignitable objects, flammables, explosives,
etc.
[2] Place that may be exposed to radiation
[3] Place where the ambient temperature or relative humidity exceeds the specified
range
[4] Place subject to direct sunlight or radiated heat from large heat sources
[5] Place subject to sudden temperature shift and condensation
[6] Place subject to corrosive gases (sulfuric acid, hydrochloric acid, etc.)
[7] Place subject to excessive dust, salt or iron powder
[8] Place where the product receives direct vibration or impact
Do not use this product outside the specified ranges. Doing so may significantly
shorten the life of the product or result in product failure or facility stoppage.
product.
Use appropriate means for transportation.
Do not step on the package.
Do not place on the package any heavy article that may deform the package.
When using a crane with a capacity of 1 ton or more, the crane must be operated
by personnel qualified to operate cranes and perform slinging operations.
When using a crane or other equipment, never use it to hoist any article exceeding
the rated load of the applicable crane, etc.
Use hoisting accessories suitable for the article to be hoisted. Select appropriate
hoisting accessories by making sure there is an ample allowance for safety in their
cutting load, etc.
Do not climb onto the article being hoisted.
Do not keep the article hoisted.
Do not stand under the hoisted article.
The storage/preservation environment should conform to the installation
environment. Among others, be careful not to cause condensation.
(1) Installing the robot, controller, etc.
Be sure to firmly secure and affix the product (including its work part).
If the product tips over, drops, malfunctions, etc., damage or injury may result.
Do not step on the product or place any article on top. The product may tip over or
the article may drop, resulting in injury, product damage, loss of/drop in product
performance, shorter life, etc.
If the product is used in any of the following places, provide sufficient shielding
measures:
[1] Place subject to electrical noise
[2] Place subject to a strong electric or magnetic field
[3] Place where power lines or drive lines are wired nearby
[4] Place subject to splashed water, oil or chemicals
Pre-4
No. Task Note
4 Installation/
startup
(2) Wiring the cables
Use IAI’s genuine cables to connect the actuator and controller or connect a
teaching tool, etc.
Do not damage, forcibly bend, pull, loop round an object or pinch the cables or
place heavy articles on top. Current leak or poor electrical continuity may occur,
resulting in fire, electric shock or malfunction.
Wire the product correctly after turning off the power.
When wiring a DC power supply (+24 V), pay attention to the positive and negative
polarities.
Connecting the wires in wrong polarities may result in fire, product failure or
malfunction.
Securely connect the cables and connectors so that they will not be disconnected
or come loose. Failing to do so may result in fire, electric shock or product
malfunction.
Do not cut and reconnect the cables of the product to extend or shorten the cables.
Doing so may result in fire or product malfunction.
(3) Grounding
Be sure to provide class D (former class 3) grounding for the controller. Grounding
is required to prevent electric shock and electrostatic charges, improve noise
resistance and suppress unnecessary electro m agnetic radiation.
(4) Safety measures
Implement safety measures (such as installing safety fences, etc.) to prevent entry
into the movement range of the robot when the product is moving or can be
moved. Contacting the moving robot may result in death or serious injury.
Be sure to provide an emergency stop circuit so that the product can be stopped
immediately in case of emergency during operation.
Implement safety measures so that the product cannot be started only by turning
on the power. If the product starts suddenly, injury or product damage may result.
Implement safety measures so that the product will not start upon cancellation of
an emergency stop or recovery of power following a power outage. Failure to do so
may result in injury, equipment damage, etc.
Put up a sign saying “WORK IN PROGRESS. DO NOT TURN ON POWER,” etc.,
during installation, adjustment, etc. If the power is accidently turned on, electric
shock or injury may result.
Implement measures to prevent the work part, etc., from dropping due to a power
outage or emergency stop.
Ensure safety by wearing protective gloves, protective goggles and/or safety
shoes, as necessary.
Do not insert fingers and objects into openings in the product. Doing so may result
in injury, electric shock, product damage, fire, etc.
When releasing the brake of a vertically installed actuator, be careful not to pinch
your hand or damage the work part, etc., due to the slider dropping by its dead
weight.
5 Teaching Whenever possible, perform teaching from outside the safety fences. If teaching
must be performed inside the safety fences, prepare “work rules” and make sure
the operator understands the procedures thoroughly.
When working inside the safety fences, the operator should carry a handy
emergency stop switch so that the operation can be stopped any time when an
abnormality occurs.
When working inside the safety fences, appoint a safety watcher in addition to the
operator so that the operation can be stopped any time when an abnormality
occurs. The safety watcher must also make sure the switches are not operated
inadvertently by a third party.
Pre-5
No. Task Note
5 Teaching Put up a sign saying “WORK IN PROGRESS” in a conspicuous location.
When releasing the brake of a vertically installed actuator, be careful not to pinch
your hand or damage the work part, etc., due to the slider dropping by its dead
weight.
* Safety fences --- Indicate the movement range if safety fences are not provided.
6 Confirmation
operation
After teaching or programming, carry out step-by-step confirmation operation
before switching to automatic operation.
When carrying out confirmation operation inside the safety fences, follow the
specified work procedure just like during teaching.
When confirming the program operation, use the safety speed. Failure to do so
may result in an unexpected movement due to programming errors, etc., causing
injury.
Do not touch the terminal blocks and various setting switches while the power is
supplied. Touching these parts may result in electric shock or malfunction.
7 Automatic
operation
Before commencing automatic operation, make sure no one is inside the safety
fences.
Before commencing automatic operation, make sure all related peripherals are
ready to operate in the auto mode and no abnormalities are displayed or indicated.
Be sure to start automatic operation from outside the safety fences.
If the product generated abnormal heat, smoke, odor or noise, stop the product
immediately and turn off the power switch. Failure to do so may result in fire or
product damage.
If a power outage occurred, turn off the power switch. Otherwise, the product may
move suddenly when the power is restored, resulting in injury or product damage.
8 Maintenance/
inspection
Whenever possible, work from outside the safety fences. If work must be
performed inside the safety fences, prepare “work rules” and make sure the
operator understands the procedures thoroughly.
When working inside the safety fences, turn off the power switch, as a rule.
When working inside the safety fences, the operator should carry a handy
emergency stop switch so that the operation can be stopped any time when an
abnormality occurs.
When working inside the safety fences, appoint a safety watcher in addition to the
operator so that the operation can be stopped any time when an abnormality
occurs. The safety watcher must also make sure the switches are not operated
inadvertently by a third party.
Put up a sign saying “WORK IN PROGRESS” in a conspicuous location.
Use appropriate grease for the guides and ball screws by checking the operation
manual for each model.
Do not perform a withstand voltage test. Conducting this test may result in product
damage.
When releasing the brake of a vertically installed actuator, be careful not to pinch
your hand or damage the work part, etc., due to the slider dropping by its dead
weight.
* Safety fences --- Indicate the movement range if safety fences are not provided.
9 Modification The customer must not modify or disassemble/assemble the product or use
maintenance parts not specified in the manual without first consulting IAI.
Any damage or loss resulting from the above actions will be excluded from the
scope of warranty.
10 Disposal When the product becomes no longer usable or necessary, dispose of it properly
as an industrial waste.
When disposing of the product, do not throw it into fire. The product may explode
or generate toxic gases.
Pre-6
Indication of Cautionary Information
The operation manual for each model denotes safety guides under “Danger,” “Warning,” “Caution” and
“Note,” as specified below.
Level Degree of danger/loss Symbol
Warning
Danger
Caution
Note
Failure to observe the instruction will result in an imminent
danger leading to death or serious injury.
Failure to observe the instruction may result in death or
serious injury.
Failure to observe the instruction may result in injury or
property damage.
The user should take heed of this information to ensure the
proper use of the product, although failure to do so will not
result in injury.
Danger
Warning
Caution
Note
Pre-7
Pre-8
1. Foreword
Thank you for purchasing an IAI product.
This operating manual describes the correct handling, structure, maintenance and other aspe cts of your
actuator.
Before using your actuator, be sure to read this operating manual and handle the actuator correctly. Keep
this manual with you so that you can reference applicable information whenever necessary.
For more complete information on operating the actuator, also peruse the operating manual for your
controller.
2. Safety Precautions
2.1 Basic Handling
You must assume that any handling or operation not specifically explained in this operating manual or
the controller operating manual cannot be performed, and do not perform any such handling or
operation.
Always use IAI’s genuine parts for wiring between the actuator and controller.
Entering the operation range of the machine while the machine is operating or receiving power may
create a dangerous situation and must be avoided at all cost.
2.2 Maintenance and Inspection
Be sure to turn off the controller power before performing maintenance or inspection.
Exercise due caution so that other operator will not turn on the power inadvertently while inspection is
still in progress.
Put up a plate or other sign that clearly states “WORK IN PROGRESS,” etc., in a conspicuous location.
If two or more operators work together to perform maintenance or inspection, the operators should
mutually watch out for each other’s safety. Particularly when turning on/off the power or moving the
axis, always call out before each action to ensure safety.
2.3 Permanent Magnets
This actuator uses high-performance rare-earth permanent magnets.
Accordingly, the actuator may cause malfunction in medical devices such as pacemakers.
Those who are wearing a pacemaker or any other medical device must not come within 30 cm of the
actuator.
(Note)
The information provided in this manual is subject to change without notice for the purpose of
modification and improvement.
This manual has been written with due attention to precision and completeness, but there may still be
inaccuracies and omissions. Should you find any error, or if you have any feedback, please contact
IAI’s Engineering Service Section or Sales Engineering Section.
1
3. Warranty
3.1 Warranty Period
Warranty period shall be either of the following periods whichever ends first:
18 months after shipment from our factory
12 months after delivery to a specified location
2500 hours of operation time
3.2 Scope of Warranty
If a breakdown occurs within the period specified above and is due to the manufacturer's error, we will
repair the unit at no cost. However, the following items are not covered by this warranty.
Faded paint or other changes that occur naturally over time.
Consumable components that wear out with use.
Unit seems to be noisy or similar impressions that do not affect machinery performance.
Damage resulting from improper handling by the user or lack of proper maintenance.
Any alterations made by other than IAI or its representatives.
Breakdowns caused by using controllers made by other manufacturers.
Any damages caused by fire and other natural disasters or accidents.
The warranty pertains to the purchased product itself and does not cover any damages that might arise
from a breakdown of the supplied product.
Any repairs will be done at our factory. Even if the product is still covered under the warranty period, we
will assess a separate charge for sending technicians to the customer's site.
2
4. Name of Each Part
The name of each part of the actuator is specified below.
In this manual, the right-left directions of the actuator are indicated by viewing the actuator from its top and
also from its home side, with the actuator placed horizontally. “Front” refers to the side opposite to one on
which the actuator home is located.
*1 In the above figure, the cables are facing top, while the home is located on the right side.
End cover
The actuator is shipped with its home adjusted to the side specified by the customer. Accordingly, the
home position on your actuator may be different from the direction shown in the figure.
Side covers
Stainless sheet
Cables
Slider
Right
Left
Home side
*1
Slider cover
End cover
3
5. Transportation and Handling
5.1 Handling the Actuator by Itself
When transporting the actuator by itself, take note of the items specified below.
5.1.1 Handling the Packed Actuator
Unless otherwise specified, the actuator of single-axis configuration is packed individually.
When transporting or handling the packed actuator, exercise due caution not to hit the package against
other object or drop the package.
If the package is heavy, the operator must not attempt to carry the package alone.
When setting down the package, place it horizontally.
Do not step onto the package.
Do not place on the package any heavy object or other article with an area of concentrated mass that
may cause the package to deform.
5.1.2 Handling the Unpacked Actuator
When handling the unpacked actuator, hold it by the base.
Warning
Do not apply excessive force on any part of the actuator. When transporting the actuator, do not hold it by
the stainless sheet, cables, cable track or slider. In particular, never apply force on the stainless sheet.
This actuator uses high-performance rare-earth permanent magnets. Therefore, those who are wearing a
pacemaker or any other medical device must not come within 30 cm of the actuator.
Handling precaution for the stainless sheet
The stainless sheet has a thickness of only 0.1 mm or so in order to provide flexibility. Because of this very
thin design, the stainless sheet easily gets dented and scratched. If the damaged stainless sheet is used
continuously, the sheet may eventually break.
Taboos in transportation
Do not transport the actuator by holding its slider. Do not transport the actuator by holding its cables.
Do not transport the actuator by holding its cable track. Do not transport the actuator by holding its stainless sheet.
4
5.2 Handling the Actuator Assembly
Pay attention to the following instructions when transporting an assembly of actuator axes.
5.2.1 Condition of Shipment from IAI (Assembled)
The actuators you have ordered are assembled at IAI, after which the assembly receives a shipping
inspection and is shipped in an outer frame with skids.
The assembly is packed with the sliders securely affixed so that they will not move unexpectedly during
transportation. In the case of a combined unit, the actuator ends are secured to prevent swinging due to
external vibration.
The package is not designed with special considerations for protection against impact due to dropping or
collision, so please handle the package with care. Also, do not place any heavy object on the outer
frame, as it is not strong enough to withstand loads.
When suspending the package using ropes, etc., pass the ropes from underneath the reinforcement
frames at the bottom of the skids. When lifting with a forklift, also place the forks underneath the skids.
Set down the package carefully so as not to apply impact to the assembly or cause it to bounce.
After unpacking, handle the actuator assembly correctly by observing the instructions given below.
5.2.2 Handling after Assembly with Peripheral Equipment
When transporting the actuators that have been assembled with peripheral equipment either at IAI or on
your site, observe the instructions given below.
Secure each slider to prevent unexpected movement during transportation.
If any actuator end is protruding, secure it to prevent swinging due to external vibration.
If the actuator ends are not secured, do not apply any impact force exceeding 0.3 G during
transportation.
When suspending the actuator-assembled peripheral equipment using ropes, etc., make sure the ropes
do not contact the actuators directly.
Pass the ropes over appropriate cushion materials, and make sure the loads from the ropes will be
received by the base of each actuator.
Secure the end of the Y-axis using a se parate rope to maintain the axis in a stable horizontal position.
At this time, be careful not to apply loads on the screw cover.
Be careful not to allow the brackets, covers and connector box of each actuator to receive loads.
Also protect the cables from pinching or excessive deformation.
5
6. Installation, Storage/Preservation Environment
6.1 Operating Environment
The actuator should be set up in an environment, which meets the following criteria:
Avoid direct sunlight.
Avoid radiant heat from strong heat source s such as a furnace.
Ambient temperature should be 0 ~ 40C.
The humidity should be less than 85% and there should be no condensation.
Avoid exposure to corrosive or combustible gases.
The area should have very little dust and be suitable for normal assembly operat ions.
Avoid exposure to oil mist or fluids used in cutting.
Impact and vibration must not be transmitted.
Avoid extreme electromagnetic waves, ultraviolet rays and radiation.
This product is not intended to be used in a chemi cal environment.
In general, the environment should be one in which an operator can work without protective gear.
6.2 Storage/Preservation Environment
The storage/preservation environment should be similar to the operating environment. In addition, you
must take pre-cautions against condensation if the unit is to be stored for a long period of time. Unless
there are special instructions, we do not include moisture absorption agents when shipping the unit. If you
are storing the unit where condensation might occur, then you must treat the entire package or treat the
unit itself after it is unpacked to prevent condensation. The unit can withstand up to 60C during a short
storage/preservation interval but only up to 50C if the storage/preservation period is longer than one
month.
6
7. Installation
Notes on Installation
[Stainless sheet]
The stainless sheet is designed very thin (thickness: 0.1 mm) in order to ensure flexibility. Therefore,
the stainless sheet is easily dented or scratched. Once dented or scratched, the stainle s s sheet may
break during use.
When installing the stainless sheet, pay attention to the following points. Also, be careful not to let a
tool or work part drop onto the actuator to dent the exterior of the actuator.
Do not press the sheet directly with hands.
Do not generate powder dust or iron powder around the stainless sheet.
If dust/powder has generated, thoroughly remove attached dust/powder from the stainless sheet after the
operation.
If the actuator is operated with the stainless sheet carrying foreign particles, the particles may enter the
slider and damage the sheet or cause the sheet to deform, lift or present other problems.
Also, magnets are attached to the side covers to keep the stainless sheet in position. Since these
magnets attract metal debris, iron powder and other metal objects, due attention must be paid to the
surrounding environment.
Do not press the sheet directly with hands.
[Slider cover]
Do not apply force on the slider cover. It may cause interference and other damages.
Slider cover
7
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