SNT ACL2 120 Installation and operating instructions

INSTALLATION, OPERATION AND MAINTENANCEnance
NO/01/210003
LINEAR ACTUATORS
ACME SCREW
ACL2 120 - ACL2 125 - ACL2 128
ACL2 130 - ACL2 140
BALL SCREW
ACL2 120B - ACL2 125B - ACL2 128B
ACL2 130B - ACL2 140B
ENGLISH Ed 08-2021 - 02.20-25-28-40.E - Rev.03 12/19

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WARNING
Read this manual before installing, operating or maintaining this actuator. Failure to
follow safety precautions and instructions could cause actuator failure and result in
serious injury, death or property damage.
This manual provides important information on how to work with the actuator safely
and efficiently. The manual is part of the device, must always be kept in the device’s
direct proximity and should be available for personnel to read at any time. Failure to
comply with the installation, use and maintenance instructions indicated in this
manual will result in immediate termination of the warranty conditions of the
actuator and completely relieve SNT from any liability for damage caused to persons
and / or property.
SNT does not assume direct or indirect responsibility for an improper use of the
actuator, not respecting the performances of the actuator declared in the catalogs.
The manufacturer will not be liable for damage to the actuator or the equipment into
which the actuator has been installed resulting from:
•disregarding this manual
• unintended use
• employment of untrained personnel
• unauthorized conversions
• technical modifications
• manipulation or removal of the screws on the device
• use of unapproved spare parts
The aforementioned conditions are therefore not contemplated and entail the
immediate termination of the guarantee and the immediate decay of any
responsibility on the part of SNT.
SNT reserves the right to make changes to the actuators and this manual without
giving any notice.

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LINEAR ACTUATORS ACL2/ACL2B 20 - 25 - 28 - 30 - 40
Installation, operation and maintenance manual
Contents
1 MODELS COVERED BY THIS DOCUMENT....................................................................................................5
2 IDENTIFICATION OF THE MANUFACTURER AND THE PRODUCT................................................................5
2.1 Identification of the manufacturer.....................................................................................................5
2.2 Description of the product .................................................................................................................5
2.3 Identification of the product ..............................................................................................................6
3 TRANSPORT AND HANDLING......................................................................................................................7
4 USE RESTRICTION .......................................................................................................................................8
4.1 Intended use.......................................................................................................................................8
4.1.1 Use restrictions...........................................................................................................................8
4.1.2 Standard operating conditions...................................................................................................9
4.1.3 Thermal limit ..............................................................................................................................9
4.2 Personnel requirements / Qualifications ...........................................................................................9
5 STORAGE.....................................................................................................................................................9
6 INSTALLATION ..........................................................................................................................................10
6.1 Safety warnings ................................................................................................................................10
6.2 FCE electric stroke limit switches .....................................................................................................11
6.3 FCM magnetic stroke limit switches.................................................................................................12
6.4 Rotary encoder ENC.4 ......................................................................................................................14
6.5 Rotary encoder GI.2X........................................................................................................................14
6.6 Rotary encoder EH53........................................................................................................................15
6.7 Safety clutch FS.................................................................................................................................15
6.8 Electric motor wiring ........................................................................................................................16
6.9 Linear actuator installation ..............................................................................................................17
6.10 Installation of rod end fitting elements.........................................................................................18
7 COMMISSIONING AND USE......................................................................................................................19

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8 LUBRICATION............................................................................................................................................20
9 MAINTENANCE .........................................................................................................................................20
9.1 Maintenance of ACL2/ACL2 B 20-25-28 actuators...........................................................................20
9.2 Maintenance of ACL2/ACL2 B30-40 actuators ................................................................................20
9.2.1 Linear drive lubrication..............................................................................................................21

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1MODELS COVERED BY THIS DOCUMENT
The present manual is referred to following products:
Acme screw linear actuators: ACL2 120 –ACL2 125 –ACL2 128 –ACL2 130 –ACL2 140
Ball screw linear actuators: ACL2 120B–ACL2 125B–ACL2 128B–ACL2 130B–ACL2 140B
2IDENTIFICATION OF THE MANUFACTURER AND THE PRODUCT
2.1Description of the product
For all the technical characteristics of the product (performance, features, dimensions) refer to the
technical catalog.
Main actuator components:
1) Push rod
2) External tube
3) Gearbox housing
4) Rod end
5) Rear hinge
6) Magnetic limit switches FCM
7) Electric stroke limit device FCE
8) Linear drive grease nipple (only for ACL2/ACL2 B 30-40)
9) Electric motor
1
2
3
4
5
6
7
8
Figure 2.1 –Linear actuator components
9
ACL2/ACL2 B with electric stroke limit FCE
ACL2/ACL2 B with magnetic limitswitches FCM
1
4
2
3
5
9

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2.3 Identification of the product
Every linear actuator is provided with a nameplate, which allows the product identification and gives
technical information about the product.
1)
Product code: is an alphanumeric code stating the type of the linear actuator
2)
3) Serial number: is the identification number of the actuator which identifies the exact design of the
product even after a long time; the serial number is the essential reference for spare part orders.
Product description (the mining of symbols and their sequence are indicated on the
catalogue);

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3TRANSPORT AND HANDLING
It is recommended to pay attention and care during the handling and transport of linear actuators
not to damage mechanical parts and / or accessories and to prevent risks for the personnel in charge
of this activity.
The packaging must be lifted and moved with care and in a safe way.
For lifting and transporting the linear actuator, the push rod must be in retracted position.
Lift the actuator from the housing and outer tube, supporting the motor during transport.
DO NOT lift the actuator from the push rod and / or the motor.
In the case of ACL2 Bseries actuators, the ball screw inside the actuator is NOT self-locking. Never lift
the linear actuator upright from the push rod as the actuators could be back driven by its own weight.
Figure 3.1 –Transport and handling
In case of doubt, consult SNT to get the appropriate information and prevent any kind of damage!

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4USE RESTRICTION
The information contained in this chapter provides important prescriptions for operating safely during all
phases of the product's life.
Not knowing or not complying with these provisions can generate dangerous situations that could cause
damage to equipment and risks for the safety of persons.
4.1 Intended use
Actuators are used to perform very different functions within machines. It is the responsibility of the machine
builder to design the application in compliance with the laws in force in the specific sector and in the field of
safety, in compliance with the requirements provided in the product catalog and in this manual.
ACTUATORS ARE ELECTRIC AXIS, WHATEVER DRIVER OR CONTROL WILL BE USED: THE SELECTION OF
THE PRODUCT AS STROKE, SPEED, TYPE OF LIMIT SWITCHES, MOTOR AND BRAKE, MUST BE DONE
ACCORDING TO THE BEHAVIOR EXPECTED, IN FUNCTION OF THE TYPE OF CONTROL CHOOSEN AND
THE STATIC AND DYNAMIC BEHAVIOR OF THE SYSTEM IN WHICH THE ACTUATOR IS PLACED!
The actuators have been designed and built to operate mobile parts of various types, shapes and
construction, in the ways and within the limits set out in the descriptions and tables of the technical data in
the catalog and in this user manual.
The actuators are designed to work with a purely axial applied load.
They must be subjected to the loading and speed conditions specified in the catalog.
Modification of parts of the actuator or replacement of components with different and non-original parts is
not permitted. The replacement of components with original spare parts is carried out only by Servomech
S.p.A.
Any different use is to be considered improper and therefore potentially dangerous for the safety of the
operators, as well as such as to void the contractual guarantee.
In the event of particular processing requirements, we recommend consulting our sales department. Every
modification must be authorized by SNT with written documents.
ANY OTHER USE OUTSIDE THAT THAT JUST DESCRIBED IS NOT PERMITTED BY SNT
4.1.1 Use restrictions
Actuators can not be used for unforeseen applications.
Any utilization of this device beyond its intended purpose may lead to potentially hazardous situations.
Therefore:
•Strictly adhere to all safety precautions and instructions in this operating manual.
•Do not allow this device to be subjected to weather conditions, strong UV rays, corrosive or explosive
air media as well as other aggressive media (*).
•Do not modify, retool or change the structural design or individual components of the actuator.
•Never use the device outside of the technical application and operational limits.
(*) –THE USE OF THE ACTUATOR IN ABOVE CONDITIONS MUST BE PREVIOUSLY DECLARED AND
AGREED WITH SNT, SINCE A SPECIAL EQUIPMENT OF THE PRODUCT MUST BE PROVIDED.

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4.1.2 Standard operating conditions
The actuator must be used in an environment whose conditions comply with the provisions of SNT. The
works necessary for obtaining and maintaining that conditions are in charge of the owner and, where
applicable, are in charge of the end user.
The actuator must be installed and used indoor only, in dry area with environmental conditions as specified
below:
Temperature range +0°C ÷ +40°C
Relative atmospheric humidity 5% ÷ 85%
No build up of condensation
THE USE OF THE ACTUATOR IN DIFFERENT CONDITIONS THAN JUST DESCRIBED MUST BE PREVIOUSLY
DECLARED AND AGREED WITH SNT, SINCE A SPECIAL EQUIPMENT OF THE PRODUCT MUST BE
PROVIDED.
4.1.3 Thermal limit
The actuator duty cycle permissible Fi [%] is the maximum working time expressed in percentage that the
actuator can perform during the reference time period of 10 minutes, under rated load stated in the
catalogue at ambient temperature 25°C, without risk of internal parts overheating.
𝑭𝒊[%]=𝑀𝑎𝑥 𝑤𝑜𝑟𝑘𝑖𝑛𝑔 𝑡𝑖𝑚𝑒 𝑜𝑣𝑒𝑟 10 𝑚𝑖𝑛
10 𝑚𝑖𝑛 ×100
Linear drive
Fi [%]
Acme screw (ACL2 series)
30
Ball screw (ACL2 B series)
100
For the proper operation of acme screw linear actuators (ACL2series) do never exceed the
permissible duty cycle limit.
4.2 Personnel requirements / Qualifications
This manual must be made available to the personnel in charge of installation, start up and use of the
actuator. It is the responsibility of the machine builder:
use personnel with the necessary qualifications for the installation and commissioning of the
actuator;
periodically check the qualification of the assigned personnel;
check that the personnel in charge are aware of the contents of this manual.
5STORAGE
Do not store outside.
Storage should be dry and dust-free.
Keep away from any aggressive media.
Protect from UV radiation.
Avoid mechanical vibrations.
Storage temperature: 0 to +50 °C.
Relative atmospheric humidity: max. 95% (no build up of condensation).
To store longer than 6 months, take care of moving the input shafts to prevent damages to
sealings.
Also check that all unpainted steel parts are adequately protected (oiled and /or greased) to
prevent oxidation.

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6INSTALLATION
The operations described in the paragraphs of this chapter provide both electrical and mechanical
connections of the actuator, as well as the execution of test motions at reduced speed and motor torque or
with small displacement steps.
6.1 Safety warnings
MOTORS CANNOT BE CONNECTED DIRECTLY TO THE ELETRICITY GRID. A PROPER CIRCUITS AND
DEVICES FOR MOVEMENT MANAGEMENT ON BOTH DIRECTIONS IS REQUIRED. STROKE END LIMIT
SWITCHES (MICROSWITCHES OR SENSORS) MUST BE CONTROLLED TO BE SURE THE LINEAR
MOVEMENT OF THE ACTUATOR (DUE TO THE OPERATION OF THE MOTOR OR TO THE INERTIA OF
THE MOVING PARTS) STOPS BEFORE TO REACH THE MECHANICAL STROKE END LIMITS. IN CASE THIS
HAPPENS, THE ACTUATOR CAN BE LOCKED AND THE INTERNAL COMPONENTS CAN BE DAMAGED.
WHEN THE MOTORS MUST BE POWERED BY A CONVERTER (ELECTRIC DRIVE), THIS MUST BE CHOSEN
BY QUALIFIED PERSONNEL.
IN CASE THERE ARE INVOLVED ELECTRONIC DRIVE AND CONTROL DEVICES ON THE ACTUATOR
MOVING CONTROL, REFER TO MANUALS FOR ALL THE NECESSARY INFORMATION AND CORRECT
INSTALLATION AND MAINTENANCE OF THE PRODUCT.
BEFORE TO PROCEED TO THE ELECTRIC CONNECTION, MAKE SURE THE SUPPLY VOLTAGE IS TURNED
OFF.
BEFORE TO TURN-ON THE MOTOR, MAKE SURE THE ELECTRIC CONNECTIONS ARE TIGHTENED AND
STABLE.
CHECK POWER SUPPLY CABLES NOT TO BE DAMAGED DURING THE COMMISSIONING. POWER
SUPPLY CABLES MUST BE OUT OF HEAT SOURCES AND MOVING ORGANS.
DURING FUNCTIONING ARE PRODUCED MAGNETIC, ELECTRIC AND ELECTROMAGNETIC FIELDS. THIS
MAY BE DANGEROUS FOR PEOPLE THAT USE CARDIAC STIMULATOR (PACEMAKER), IF NOT
SUFFICIENT DISTANCE.
DO NOT DISCONNECT ANY CONNECTION DURING OPERATION OR IN PRESENCE OF SUPPLY VOLTAGE.
BEFORE TO TURN-ON THE MOTOR, MAKE SURE THE MECHANICAL CONNECTIONS OF THE ACTUATOR
REMAIN TIGHTENED AND STABLE, ALSO DURING THE OPERATION.
DURING THE COMMISSIONING, UNEXPECTED MOVEMENT OF THE MOTOR MAY BE CAUSED BY:
WIRING ERRORS
MOUNTING ERRORS
DAMAGES ON POWER SUPPLY CABLES
HARDWARE OR SOFTWARE ERRORS
DRIVER PARAMETERS ERRORS
OPERATION IN CONDITIONS OUTSIDE THE SPECIFICATIONS PROVIDED BY THE
CATALOG AND THIS MANUAL
MAKE SURE THE SAFETY PROTECTION OF THE MACHINE (MECHANICAL AND ELECTRICAL) ARE
ACTIVE.
DURING OPERATION, TEMPERATURE OF THE EXTERNAL SURFACE OF MOTORS CAN REACH HIGH
TEMPERATURES. HOT SURFACES ON ACTUATOR CAN CAUSE BURNS AND SHOULD NOT BE TOUCHED.

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6.2 FCE electric stroke limit switches
The ELECTRIC STROKE LENGTH LIMIT DEVICE allows to limit the actuator stroke length avoiding to reach the
extreme positions (mechanical stop) and preventing damage.
The FCE device consists of 2 normally closed electric switches installed inside a sealed box made in
engineering plastic or aluminium alloy. A brass collar allows, with its special shape, activation of the electric
switches. It is balanced by 2 opposite preloaded helical springs, which reset the position when the actuator
starts moving again in the opposite direction. 2 wiper seals between the axial travelling collar and the
housing. The activation of the collar, and consequently of the limit switches, in one or in the opposite
direction is done by a stainless steel rod driven by the push rod. The stainless steel rod slides inside the collar
activating it when the adjustable ring pushes on the collar, which activates the switch.
Figure 6.1 –FCE electric stroke limit switches
Ring 1 activates FC 1 switch and fixes the required RETRACTED ACTUATOR stop position.
Ring 2 activates FC 2 switch and fixes the required EXTENDED ACTUATOR stop position.
To setup the stop positions: simply release the grub screw on the ring, move it on the required stop
position and fix the screw again.
The maximum ring positions on the rod consist on the extreme stroke lengths positions “Lc” and “La”
(see Fig. 6.10).
The ELECTRIC STROKE LENGTH LIMIT DEVICE must be connected to the electric control circuit as shown in
the following WIRING DIAGRAM.
CONTROL CIRCUIT
ELECTRIC SWITCH –TECHNICAL FEATURES
Contact
NC (normally closed)
Voltage
250 V AC
30 V DC
125 V DC
Current (resistive load)
5 A
5 A
1.4 A
Current (inductive load)
3 A
0.1 A
—
Outlet
Multicore PVC cable 4 × 0.75 mm2
length 1.5 m
Wiring
WHITE –NC contact of FC1
BROWN –COM contact of FC1
YELLOW –NC contact of FC1
GREEN –COM contact of FC2
DO NOT TRAVEL OVER THE STROKE LIMIT SWITCHES POSITIONS, IN ORDER TO AVOID DAMAGES TO
THE LIMIT SWITCHES DEVICE.
In case of high speed application (≥ 30 mm/s linear speed) and/or with high inertia load, be sure to
slow down the motor before to reach the limit switches position. Use the motor brake (if present) to
ensure the stop position.
THE FCE ELECTRIC STROKE LIMIT DEVICE CANNOT BE USED AS ANTI-TURN DEVICE OF THE PUSH ROD.

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6.3 FCM magnetic stroke limit switches
The magnetic stroke end switches FCM allow to limit the actuator stroke length avoiding to reach the extreme
positions (mechanical stop) and preventing damage. Using more switches it is also possible to set
intermediate positions along the actuator stroke length.
The stroke end switches must be fixed on the external tube and are activated by a toroidal magnetic field
independently of their angular position.
The magnetic reed switches can work only if connected to a control circuit to activate electric relay.
Do not connect the reed switches in series between the power supply and the electric motor.
Actuators equipped with magnetic stroke end switches perform a linear travel shorter than their
stroke length code, because the reed switch FC 1 gives the stopping signal to the actuator before the
actuator has travelled the total stroke length. To know the actual stroke please refer to the product
catalogue or to the check sheet supplied with the actuator.
When using more contact reeds for intermediate positions, it shall be considered that the same reed
switch can give the signal in 2 different positions, depending on the actuator motion which can be
retracting or extending.
Figure 6.2 –FCM magnetic stroke limit switches
FCM magnetic limit switches are supplied already fixed on extreme stroke positions Lc and La (see Fig. 6.10):
RETRACTED ACTUATOR (Lc) position: FC 1 reed switch fixed on the tube up to the actuator housing.
EXTENDED ACTUATOR (La) position: FC 2 reed switch fixed on the limit marked on the outer tube.
The position of the reed switches can be adjusted by changing the fixing clamp position on the tube:
Release the screw on the fixing clamp (do not release the fixing screw of the reed sensor)
Move the fixing clamp on the tube to the desired position (do not exceed the maximum range Lc …
La)
Fix the screw of the clamp.
DO NOT SET THE FC 2 SWITCH POSITION OVER THE LIMIT MARK ON THE TUBE.
DO NOT TRAVEL OVER THE STROKE LIMIT SWITCHES POSITIONS, AVOIDING TO REACH MECHANICAL
STOP AND PREVENTING DAMAGE TO THE INTERNAL COMPONENTS OF THE ACTUATOR.

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The MAGNETIC LIMIT SWITCHES must be connected to the electric control circuit as shown in the
following WIRING DIAGRAM:
CONTROL CIRCUIT
Normally closed (NC) switches
Normally open (NO) switches
REED SWITCHES –TECHNICAL FEATURES
Contact
NC
NO
Switching output
Reed
Supply voltage
5 ÷ 120 V AC/DC (1)
5 ÷ 230 V AC/DC (2)
Voltage drop
≤ 0.35 V
Continous current
≤ 100 mA (AC)
Switching capacity
≤ 6 W
Protection class
II
Enclosure rating
IP 65
Sensor housing material
Plastic
Clamp material
Stainless steel, Zinc cast
Outlet
Multicore PVC cable 2 × 0.12 mm2
length 2 m
Wiring
BN = brown
BU = blue
(1) Main fuse F < 0.8A IEC60127-2 sheet 1
(2) Main fuse F < 0.5A IEC60127-2 sheet 1

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6.4 Rotary encoder ENC.4
Encoder ENC.4 –TECHNICAL FEATURES
Transducer type
Hall-effect encoder, incremental, bi-directional
Resolution
4 pulses per revolution
Output
PUSH-PULL
2 channels (A and B, phase difference 90°)
Supply voltage
8 ÷ 32 V DC
Max commutable current IOUT
100 mA
Max output voltage drop
with load connected to 0 and IOUT = 100 mA: 4.6 V
with load connected to + V and IOUT = 100 mA: 2 V
Protection
against short circuit
against input polarity inversion
against any incorrect output connection
Cable length
1.3 m
Enclosure rating
IP 55
The rotary encoder ENC.4 must be connected to the electric control circuit as shown in the following
WIRING DIAGRAM:
6.5 Rotary encoder GI.2X
THE ROTARY ENCODER GI.2X IS AVAILABLE ONLY FOR ATL/BSA 30.
Encoder GI.2X –TECHNICAL FEATURES
Transducer type
Hall-effect encoder, incremental, bi-directional
Resolution
GI.21: 1 pulse per revolution
GI.24: 4 pulses per revolution
Output
PUSH-PULL
2 channels (A and B, phase difference 90°)
Supply voltage
5 ÷ 24 V DC, max 25 V DC
No-load current
5 mA
Max commutable current
50 mA
Protection
against input overvoltage peaks
against input polarity inversion
Cable length
1.5 m
The rotary encoder ENC.4 must be connected to the electric control circuit as shown in the following
WIRING DIAGRAM:

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6.6 Rotary encoder EH53
Encoder EH53 –TECHNICAL FEATURES
Transducer type
Optical encoder, incremental, bi-directional
Resolution
100 or 500 pulses per revolution
Output
PUSH-PULL
2 channels (A and B, phase difference 90°)
channel ZERO
Input voltage
8 ÷ 24 V DC
No-load current
100 mA
Max commutable current
50 mA
Cable length
0.5 m
Enclosure rating
IP 54
The rotary encoder ENC.4 must be connected to the electric control circuit as shown in the following
WIRING DIAGRAM:
6.7 Safety clutch FS
The safety clutch is a device able to protect the actuator and the machinery where it is installed from dynamic
overload during the linear travel and from incorrect use which could bring the actuator to the mechanical
stop. This device is a torque limiter on the worm wheel.
The torque limiter clutch is preloaded during
assembly.
The preload is fixed and related to the ratio and the
performances of each actuator as stated on the
performance tables in the catalogue.
On request, a different preload can be set to achieve
different performance.
If an overload is applied on the actuator, the safety
clutch starts slipping and the push rod stops while the
motor is still running. When the overload decreases up to
the rated load value or less, the safety clutch stops slipping
and the push rod starts travelling again.
The safety clutch FS is not intended to be used as a load limiter, but only to protect the actuator and
the machinery where it is installed.
DO NOT USE THE SAFETY CLUTCH AS A STROKE END CONTROL DEVICE! If it is frequently activated it
rapidly wears, the preload is reduced and consequently also the actuator load performance is lower.

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6.8 Electric motor wiring
PLEASE REFER TO INSTALLATION INSTRUCTIONS OF THE ELECTRIC MOTOR SELECTED FOR THE
ACTUATOR.

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Check if the push rod shifting direction is compatible to the indications on the control unit, by powering the
electric motor on VERY BRIEFLY.
Figure 6.9 –Push rod shifting directions
If the push rod shifting directions are not compatible:
A) ACTUATOR WITH THREE-PHASE MOTOR: invert any wire pair (U1 V1, or U1 W1, or V1 W1) into the
terminal board;
B) ACTUATOR WITH SINGLE-PHASE MOTOR: change the contact (V1 W1);
C) ACTUATOR WITH DIRECT CURRENT MOTOR: invert contacts of the two motor supply cables.
6.9 Linear actuator installation
THE BALL SCREW LINEAR ACTUATOR (ACL2 B SERIES) IS NOT SELF-LOCKING. BEFORE TO APPLY
ANY AXIAL LOAD ON THE PUSH ROD, LOCK THE INPUT SHAFT OR USE THE MOTOR BRAKE.
ALL MECHANICAL AND ELECTRICAL PROTECTION MUST BE INSTALLED AND ACTIVATED TO PREVENT
DAMAGE TO PERSONS OR PROPERTY.
•Check that all plant fixing elements are well machined and cleaned, and that they fit the dimensions of
the actuators fixing elements they have to be fixed to.
•If the length of the actuator have to be changed (push rod more retracted or extended) during
installation, power the motor with limited speed and torque values, in order to avoid possible damages
in case of a mechanical stop is reached.
•In case of actuators without anti-rotation device (AR) and/or electrical limit switches device (FCE), it is
possible to manually screw/unscrew the push rod to change the length of the actuator.
•In case of actuators with bellow protection (B): DO NOT TWIST THE BELLOW.
DO NOT SET THE LENGTH OF THE ACTUATOR OVER ITS EXTREME VALUES:
“Lc” = RETRACTED ACTUATOR
“La” = EXTENDED ACTUATOR
Figure 6.10 –“Lc” and “La” dimensions
Dimensions “Lc” and “La” are indicated in the technical catalogue of the product and on the check sheet
supplied with the actuator.

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•Fit the actuator to the plant in order to have ONLY axial load applied to the actuator.
•Check the correct alignment between front and rear pins: they must be PARALLEL.
•Check the correct alignment between the actuator and the moving parts.
Figure 6.11 –Load on actuator: a) correct; b) not correct
RIGHT WORKING OF THE ACTUATOR AND PLANT CANNOT BE GUARANTED IF SIDE OR NOT AXIAL
LOAD ARE APPLIED TO THE ACTUATOR.
6.10Installation of rod end fitting elements
To install a mounting element on the rod end threaded bore (BA), use a wrench flat on the rod end
to counterhold the locking torque.
In case of actuator equipped with AR (anti-rotation) device: DO NOT TRANSFER ANY TORQUE TO
THE PISTON ROD.
WARNING: in case of torque transfer into the actuator with AR device, the internal mechanical
components can be damaged.
Fix the threaded element with Loctite 270.
To unmount the element, heat the threaded area to unlock it.
Unscrew the fitting element counterholding the torque with a wrench flat on the rod end.

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7COMMISSIONING AND USE
Linear actuators are supplied lubricated and ready to be used. Before to start commissioning and
activation, the following checks must be carried out:
Shifting direction check
Check if the push rod shifting direction is compatible to the indications on the control unit, by
powering the electric motor on VERY BRIEFLY. If not, see Section 6.8.
For actuator without ANTI-ROTATION device (AR): TO ALLOW THE TRANSLATION OF THE ROD END,
THE PUSH ROD ROTATION MUST BE REACTED BY USING EXTERNAL GUIDES.
Check of extreme working positions
Check if the extreme dimensions of the actuator “Lc” and “La” (see Fig. 6.10) are compatible with
extreme positions of the plant component that has to be moved.
Measure the initial length of the actuator, then run the actuator GRADUALLY from the control unit,
in order to reach the plant to its more distant extreme position.
Check continuously the current actuator length during the motion.
Repeat the same procedure for the other extreme position.
TO AVOID DAMAGES, DO NOT TRAVEL OVER THE EXTREME STROKE VALUES Lc and La!
DO NOT REACH STROKE END MECHANICAL STOP!
Commissioning
At this stage it is possible to start commissioning:
Carry out one complete working cycle, without load, adjusting the previously set limit switch
positions if necessary (see Sections 6.2 , 6.3).
Carry out some complete working cycles, increasing gradually the load, until full load is reached.
ONLY IN CASE ON ACL2 ACTUATOR (ACME SCREW DRIVE): DURING COMMISSIONING, DO NEVER
EXCEED THE MAX ALLOWED DUTY CYCLE FOR THE LINEAR ACTUATOR 30% OVER 10 MIN TIME
PERIOD AT 25°C ENVIRONMENT. ANY ABUSE OF SUCH DUTY CYCLE CAN CAUSE OVERHEATING AND
UNINTENTIONAL PREMATURE DAMAGING!

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8LUBRICATION
ACL2 and ACL2 B linear actuators series are supplied lubricated, with lubricants indicated in the table
below.
ACTUATOR
GEARBOX
LINEAR DRIVE
ACL2 120
Grease (NLGI 0 DIN 51818):
ENI Grease MU EP 0
Grease (NLGI 2 DIN 51818):
ENI Grease SM 2
Also suitable:
SHELL Gadus S2 V220D 2 (NLGI 2)
MOBIL Mobilgrease XHP 222 Special (NLGI 2)
FUCHS Renolit FLM 2 (NLGI 2)
ACL2 125 - 128
ACL2 130
ACL2 140
ACL2 120B
Grease (NLGI 0 DIN 51818):
ENI Grease MU EP 0
Grease (NLGI 1 DIN 51818):
LUBCON Thermoplex ALN 1001
Also suitable:
FUCHS Renolit DURAPLEX EP 2 (NLGI 2)
AGIP Grease AC 1 (NLGI 1)
MOBIL Mobilgrease FM 101 (NLGI 1)
KLUBER Klubersynth UH1 14-151 (NLGI 1)
ACL2 125B- 128B
ACL2 130B
ACL2 140B
Table 8.1 –Lubricants
DO NOT USE LUBRICANTS DIFFERENT FROM THOSE ABOVE MENTIONED.
DO NOT MIX INCOMPATIBLE GREASES.
IF DIFFERENT LUBRICANT SHOULD BE USED, PLEASE CONTACT SERVOMECH BEFORE PROCEED.
IN CASE OF CUSTOM PRODUCT EXECUTION, THE LUBRICANTS COULD BE DIFFERENT FROM THE
STANDARD ABOVE. TO KNOW THE TYPE OF LUBRICANT PLEASE REFER TO THE PRODUCT CHECK
SHEET SUPPLIED WITH THE PRODUCT.
9MAINTENANCE
9.1 Maintenance of ACL2/ACL2 B 20-25-28 actuators
ACL2/ACL2 B 20-25-28 actuators are long-life lubricated and do not require any further relubrication.
Every 2 months time interval: visual inspections of actuator conditions, cleaning of dirty parts of the
actuator.
In case of lubricant leakage, contact SNT.
9.2 Maintenance of ACL2/ACL2 B 30-40 actuators
The gearbox is long-life lubricated and will not require any further relubrication.
The linear drive requires periodic relubrication, according to Table 9.1, or at the latest after 1 year of
time. Please use lubricant indicated in Table 8.1 or equivalent.
Every 2 months time interval: visual inspections of actuator conditions, cleaning of dirty parts of the
actuator.
In case of lubricant leakage, contact SNT.