Servomech UAL 1 User manual

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 1
LINEAR ACTUATORS
UAL 1 –UAL 2 –UAL 3 –UAL 4 –UAL 5
UBA 1 –UBA 2 –UBA 3 –UBA 4 –UBA 5
Installation, operation and maintenance manual
Publication: 04.01-02-03-04-05.E - Rev. 01 Data (M/Y) 10/19
Servomech S.p.A. Via M. Calari, 1 - 40011 Anzola dell’Emilia (BO) - ITALY
Ph: + 39 051 6501711 Fax: + 39 051 734574 www.servomech.com [e-mail]

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 2
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 Servomech S.p.A. from any liability for damage
caused to persons and / or property.
Servomech S.p.A. it 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 Servomech S.p.A.
Servomech S.p.A. reserves the right to make changes to the actuators and this manual
without giving any notice.

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 3
LINEAR ACTUATORS UAL/UBA 1 - 2 - 3 - 4 - 5
Installation, operation and maintenance manual
Contents
MODELS COVERED BY THIS DOCUMENT....................................................................................................4
IDENTIFICATION OF THE MANUFACTURER AND THE PRODUCT................................................................4
2.1 Identification of the manufacturer.....................................................................................................4
2.2 Description of the product .................................................................................................................4
2.3 Identification of the product ..............................................................................................................5
TRASPORT AND HANDLING ........................................................................................................................6
USE RESTRICTION .......................................................................................................................................7
4.1 Intended use.......................................................................................................................................7
4.1.1 Use restrictions...........................................................................................................................7
4.1.2 Standard operating conditions...................................................................................................8
4.1.3 Thermal limit ..............................................................................................................................8
4.2 Personnel requirements / Qualifications ...........................................................................................8
STORAGE.....................................................................................................................................................8
INSTALLATION ............................................................................................................................................9
6.1 Safety warnings ..................................................................................................................................9
6.2 FCM magnetic stroke limit switches.................................................................................................10
6.3 FCP inductive proximity stroke limit switches..................................................................................12
6.4 Rotary encoder EH53........................................................................................................................13
6.5 Electric motor wiring ........................................................................................................................14
6.5.1 AC 3-phase asynchronous motor .............................................................................................14
6.5.2 AC 1-phase asynchronous motor with balanced winding........................................................16
6.5.3 DC motor ..................................................................................................................................17
6.6 Linear actuator installation ..............................................................................................................18
6.7 Installation of rod end fitting elements............................................................................................19
COMMISSIONING AND USE......................................................................................................................20
LUBRICATION............................................................................................................................................21
MAINTENANCE .........................................................................................................................................22
9.1 Maintenance of UAL/UBA 1-2 actuators..........................................................................................22
9.2 Maintenance of UAL/UBA 3-4-5 actuators.......................................................................................22
9.2.1 Linear drive lubrication.............................................................................................................23
9.2.2 Push rod guide lubrication .......................................................................................................24

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 4
MODELS COVERED BY THIS DOCUMENT
The present manual is referred to following products:
Acme screw linear actuators: UAL 1 –UAL 2 –UAL 3 –UAL 4 –UAL 5
Ball screw linear actuators: UBA 1 –UBA 2 –UBA 3 –UBA 4 –UBA 5
IDENTIFICATION OF THE MANUFACTURER AND THE PRODUCT
2.1 Identification of the manufacturer
SERVOMECH S.p.A. S.U.
Via Monaldo Calari, 1
40011 Anzola dell’Emilia (BO)
ITALIA
Tel. [phone]
Fax. [phone]
Website: www.servomech.com
e-mail: [e-mail]
2.2 Description 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) Belt gear transmission with thrust bearings
4) Rod end
5) Rear hinge
6) Magnetic stroke limit switches (only for UAL/UBA 1-2-3-4)
7) Proximity limit switches (only for UAL/UBA 5)
8) Linear drive grease nipple (only for UAL/UBA 3-4-5)
9) Push rod guide grease nipple (only for UAL/UBA 5)
10) Electric motor
1
2
3
4
5
6
7
8
Figure 2.1 –Linear actuator components
10
UAL/UBA 1-2-3-4
UAL/UBA 5
1
4
2
3
5
10
9

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 5
2.3 Identification of the product
Every SERVOMECH linear actuator is provided with a nameplate, as shown below, which allows the product
identification and gives technical information about the product.
Figure 2.2 –Identification nameplate
1) Product code: is an alphanumeric code stating the type, size, ratio, version and stroke end switches of
the linear actuator;
2) Ratio: is the ratio of the input drive;
3) Stroke length: is the stroke length in millimetres achievable by the actuator;
4) Linear speed: is the linear speed expressed in mm/s when the actuator is provided with electric motor;
for an actuator without motor, this field is blank;
5) Delivery date: is the week/year of assembly (example: 30/13 = week 30 / year 2013) which usually
coincides with the delivery date; this date is considered as reference for the warranty period;
6) 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.

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 6
TRASPORT 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 BSA series 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 SERVOMECH S.p.A. to get the appropriate information and prevent any kind of
damage!

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 7
USE 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 Servomech S.p.A. with written documents.
ANY OTHER USE OUTSIDE THAT THAT JUST DESCRIBED IS NOT PERMITTED BY SERVOMECH S.p.A.
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 ACTUATORS IN ABOVE CONDITIONS MUST BE PREVIOUSLY DECLARED AND AGREED
WITH SERVOMECH, SINCE A SPECIAL EQUIPMENT OF THE PRODUCT MUST BE PROVIDED.

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 8
4.1.2 Standard operating conditions
The actuator must be used in an environment whose conditions comply with the provisions of Servomech
S.p.A. 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 ACTUATORS IN DIFFERENT CONDITIONS THAN JUST DESCRIBED MUST BE
PREVIOUSLY DECLARED AND AGREED WITH SERVOMECH, 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 (UAL series)
30
Ball screw (UBA series)
100
For the proper operation of acme screw linear actuators (UAL series) 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.
STORAGE
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 actuator to prevent damages to sealings.
Also check that all unpainted steel parts are adequately protected (oiled and /or greased) to
prevent oxidation.

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 9
INSTALLATION
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 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 6.1 –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.

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 11
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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6.3 FCP inductive proximity stroke limit switches
The INDUCTIVE PROXIMITY STROKE LIMIT SWITCHES allow the actuator to stop before reaching the internal
mechanical stop avoiding damage. They can be also used to fix intermediate positions along the actuator
stroke length. The inductive proximity stroke end switches are fixed directly on the actuator outer tube in
the required position.
The switches position is not adjustable.
The positions of the two limit switches are the extreme travel positions Lc and La (see Fig. 6.10).
FC 1 –sensor for RETRACTED ACTUATOR Lc position
FC 2 –sensor for EXTENDED ACTUATOR La position
Figure 6.2 –FCP inductive proximity stroke limit switches
Proximity switches are supplied already mounted on the actuator and set to the correct sensing
distance.
DO NOT CHANGE THE SENSING DISTANCE OF PROXIMITY SWITCHES BY MOVING THE TWO NUTS
FIXED ON THE SENSOR.
In case it is necessary to restore the correct sensing distance position, please refer to Fig. 6.2.
The PROXIMITY STROKE LIMIT SWITCHES must be connected to the electric control circuit as shown in the
following WIRING DIAGRAM:
CONTROL CIRCUIT
PROXIMITY SWITCH –TECHNICAL FEATURES
Contact
NC (normally CLOSED)
Type
Inductive, PNP
Voltage
10 ÷ 30 V DC
Max output current
200 mA
Voltage drop (activated
switch)
< 3 V (ref. 200 mA)
Nominal sensing distance
2 mm
Enclosure rating
IP 67
Housing material
Nickel plated brass
Outlet
Multicore PVC cable 3 × 0.2 mm2
length 2 m
Wiring
DO NOT TRAVEL OVER THE STROKE LIMIT SWITCHES POSITIONS, AVOIDING TO REACH MECHANICAL
STOP AND PREVENTING DAMAGE TO THE INTERNAL COMPONENTS OF THE ACTUATOR.
Actuator
P [mm]
UAL 5
3.5
UBA 5
4

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6.4 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
5 ÷ 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:

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6.5 Electric motor wiring
6.5.1 AC 3-phase asynchronous motor
Connect the motor to the power unit of the plant or to the driver according to the following wiring diagrams,
related to the motor type:
(a) AC 3-phase motor without brake
(b) AC 3-phase motor with DC brake directly powered with rectifier
(c) AC 3-phase motor with 3-phase brake directly powered
(d) AC 3-phase motor with DC brake separately powered AC 1-phase with rectifier
(e) AC 3-phase motor with AC 3-phase brake separately powered
(f) AC 3-phase motor with DC brake separately powered AC 2-phase with rectifier
(g) AC 3-phase motor with DC brake separately powered
In case of brake motor:
the brake is NORMALLY CLOSED (NEGATIVE action). When the power supply is switched off, the brake
is engaged. The brake opens only when power is supplied;
if the brake is wired directly to the connecting pins of the terminal box, it does not require any power
supply;
if the brake is wired separately, make sure that the correct voltage is used;
if the brake is equipped with hand release device, make sure that the brake is engaged before starting
the linear actuator.
Figure 6.3 –Electric wiring diagrams to power supply of AC 3-ph motor
K1, K2, K3 = contactor
M = motor
Br = brake

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 15
Figure 6.3 –Electric wiring diagrams to power supply of AC 3-ph motor
Figure 6.4 –Electric wiring diagrams to motor terminal board of AC 3-ph motor
IN CASE OF ELECTRIC MOTOR DIFFERENT FROM THE ABOVE MENTIONED, PLEASE REFER TO
INSTALLATION INSTRUCTIONS SUPPLIED BY THE MANUFACTURER.
K1, K2, K3 = contactor
M = motor
Br = brake

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6.5.2 AC 1-phase asynchronous motor with balanced winding
Connect the motor to the power unit of the plant or to the driver according to the following wiring diagrams,
related to the motor type:
(a) AC 1-phase motor without brake
(b) AC 1-phase motor with DC brake separately powered AC 1-phase with rectifier
In case of brake motor:
the brake is NORMALLY CLOSED (NEGATIVE action). When the power supply is switched off, the brake
is engaged. The brake opens only when power is supplied;
the brake is wired separately, make sure that the correct voltage is used;
if the brake is equipped with hand release device, make sure that the brake is engaged before starting
the linear actuator.
Figure 6.5 –Electric wiring diagrams to power supply of AC 1-ph motor
Figure 6.6 –Electric wiring diagrams to motor terminal board of AC 1-ph motor
IN CASE OF ELECTRIC MOTOR DIFFERENT FROM THE ABOVE MENTIONED, PLEASE REFER TO
INSTALLATION INSTRUCTIONS SUPPLIED BY THE MANUFACTURER.
K1, K2, K3 = contactor
M = motor
Br = brake

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6.5.3 DC motor
Connect the motor to the power unit of the plant or to the driver according to the following wiring diagrams,
related to the motor type:
(a) DC motor without brake
(b) DC motor with DC brake separately powered
In case of brake motor:
the brake is NORMALLY CLOSED (NEGATIVE action). When the power supply is switched off, the brake
is engaged. The brake opens only when power is supplied;
the brake is wired separately, make sure that the correct voltage is used;
if the brake is equipped with hand release device, make sure that the brake is engaged before starting
the linear actuator.
Figure 6.7 –Electric wiring diagrams to power supply of DC motor
Figure 6.8 –Electric wiring diagrams to motor terminal board of DC motor
IN CASE OF ELECTRIC MOTOR DIFFERENT FROM THE ABOVE MENTIONED, PLEASE REFER TO
INSTALLATION INSTRUCTIONS SUPPLIED BY THE MANUFACTURER.
K1, K2, K3 = contactor
M = motor
Br = brake

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 18
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.
6.6 Linear actuator installation
THE BALL SCREW LINEAR ACTUATOR (UBA 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), 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

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 19
Dimensions “Lc” and “La” are indicated in the technical catalogue of the product and on the check sheet
supplied with the actuator.
Fit the actuator to the plant in order to have ONLY axial load applied to the actuator.
Check the correct alignment between front and read 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.
6.7 Installation 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.

Servomech S.p.A. 04.01-02-03-04-05.E - Rev. 01 DD (M/Y) 10/19 20
COMMISSIONING AND USE
SERVOMECH 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 6.5.
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).
Carry out some complete working cycles, increasing gradually the load, until full load is reached.
ONLY IN CASE ON UAL 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!