SKF SRSA User manual

Installation, operation and maintenance manual
Electric cylinders
SRSA, SVSA and SLSA



 Introduction – general safety instructions . . . . . . . . . . . . . . . 
. Structure of safety instructions . . . . . . . . . . . . . . . . . . . . . . . 
. Manual use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. General safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Exclusion of liability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Future changes to user manual . . . . . . . . . . . . . . . . . . . . . . . 
 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. General description of system components. . . . . . . . . . . . . . 
. Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Detailed description of supplied product . . . . . . . . . . . . . . . . 
. Designation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Performances, operation limits and operation environment 
. Storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
 Installation – general recommendations . . . . . . . . . . . . . . . . 
. Important notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Mechanical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Cylinder dimensions – Cylinder drawing . . . . . . . . . . . . . 
.. Visual cylinder position – Lt and Ltdefinition . . . . . . . . . 
.. Handling – Transportation . . . . . . . . . . . . . . . . . . . . . . . 
.. General recommendations for installation . . . . . . . . . . . 
. Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Cables for motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Limit switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
... Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
... Mounting instructions of limit switch for “retracted pos.” 
... Mounting instructions of limit switch for “extended pos.” 
.. Home switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
... Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
... Mounting instructions of home switch. . . . . . . . . . . . . 
.. Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Cables for sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Additional brake mounted on screw . . . . . . . . . . . . . . . . 
.. Automatic lubrication pump . . . . . . . . . . . . . . . . . . . . . . 
.. Servoamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Contents


 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. General procedure for commissioning . . . . . . . . . . . . . . . . . . 
. General recommendations for use. . . . . . . . . . . . . . . . . . . . . 
. How to define zero reference . . . . . . . . . . . . . . . . . . . . . . . . . 
. How to check position control behaviour – first approach . . . 
. Position control parameters – to be known . . . . . . . . . . . . . . 
 Maintenance, upkeep and routine checks. . . . . . . . . . . . . . . 
. SKF maintenance service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Lubrication – detailed description . . . . . . . . . . . . . . . . . . . . . 
.. Roller screw (or ball screw) . . . . . . . . . . . . . . . . . . . . . . . 
.. Bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Profile rail guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Spherical plain bearing . . . . . . . . . . . . . . . . . . . . . . . . . . 
.. Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Routine checks – detailed description . . . . . . . . . . . . . . . . . . 
.. Additional brake mounted on screw . . . . . . . . . . . . . . . . 
.. Belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
 Malfunctions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Mechanical malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Electrical malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. Before requiring SKF assistance . . . . . . . . . . . . . . . . . . . . . . 


 Introduction –
general safety instructions
. Structure of safety instructions
To best warn the user, depending on the nature of the danger, safety
instructions will be written as follows.
. Introduction – general safety instructions
Note
Points to note, tips, advice or
information for efficient operation with-
out any problem.
!
CAUTION
Indicates a potentially hazardous situation.
If precautionary measures aren’t taken,
it could result in minor or moderate injury.
WARNING
Indicates a potentially hazardous situation.
If precautionary measures aren’t taken,
it could result in death, serious injury or
property damage.
DANGER
Indicates an imminently hazardous situation.
If precautionary measures aren’t taken,
it could result in death, serious injury or
property damage.
. Manual use
This manual gives information and advice for the commissioning and
maintenance of SKF modular cylinders from the SRSA, SLSA, SVSA
range of products that will minimize the risk of injury and property
damage.
This document is intended for all persons who are involved with
the installation, commissioning or maintenance of these products.
Note
In the electronic document,
hypertext links have been created to
allow faster browsing inside the manual.
To use these, please press CTRL key and
while CTRL key is pressed, click on the
hypertext link. To come back, please
press ALT key and while ALT key is
pressed, press on “left arrow” key.
Generally, all titles from table of
contents are hypertext links. All other
hypertext links are pointed out in blue.
!


. General safety instructions
. Introduction – general safety instructions
DANGER
In operation, SKF cylinders could make parts move and could have hot
surfaces or parts fed by electrical current,depending on the situation.
Serious or fatal injuries or property damage will occur if the information
or precautionary measures given in this manual aren’t followed.
Generally, all works related to transportation, setup/mounting
(mechanical and electrical), startup, maintenance or storage have to be
carried out by qualified personnel in full compliance with relevant
regulations.
. Exclusion of liability
SKF does not assume liability for injury to persons or damage to
equipment or property resulting from non-observance of these
operating instructions. In such cases, any liability is excluded.
. Future changes to user manual
To constantly improve the quality of its products, SKF reserves the
right to modify this manual without informing its customers. It is the
responsibility of the customer to have the current release of the
manual so that the user will benefit from the latest information and
advice. For more details, please contact your SKF sales representative.
In any event, SKF won’t be liable for any adverse consequences to
the SKF product user or any property because of user manual
modification.


 General notes
. General description of system
components
Generally, the scope of supply of SKF cylinders includes:
• Cylinder
• Motor power cable
• Motor sensor cable
• Motion controller
• Electronic interface to make connection between PC and motion
controller.
To know the exact definition of SKF supply, please read paragraph
. Detailed description of supplied product
. General notes


The general drawing below illustrates the SKF electromechanical
cylinder’s relationship with the user’s environment:
. General notes
Customer PC
Customer main controller /PLC
Customer electrical cabinet
SKF
motion
controller
Sensors (limit switches, home switch)
Motor power cable.
Motor sensor cable.
Possible communications with external environment
– if necessary – : analog/digital inputs/outputs, fieldbus.
Connection with PC (temporarily necessary for setting up)
F3
F2
F5
F4
F1
7
STU
4
JKL
ESC
+/-
«
1
ABC
8
VWX
5
MNO
←
0
π
2
DEF
9
YZ
6
PQR
RET
–

3
GHI
MEMFIX
ESC RET
F3
z
F2
z
F1
z
F4
z
F5
z
3 x 400 V AC
1 x 24 V DC
3
4
2
1


. Operating principle
. General notes
The operating principle of SKF electromechanical cylinders
Comments
Motor rotor
ωaRotating speed of motor shaft
ωbRotating speed of roller screw or ball screw
Gear system between motor shaft and roller screw
(or ball screw) shaft. ris gear ratio.
ωa
r = –––
ωb
Roller screw or ball screw = screw gear changing
rotation of screw (green color) into translation of
nut and pushing tube of cylinder (red color).
Pushing tube of cylinder
Sc Translation speed of pushing tube
xTranslation move of pushing tube
Anti-rotation of pushing tube. Depending on cylin-
der definition, this system is integrated into the
cylinder or located on the customer’s machine.
Description of kinematic joints
JRevolute joint
JScrew joint
JPrismatic joint
J
J
J
The operating principle of SKF electromechanical cylinders is described
by the cinematic drawing below (established in accordance with
NF EN ISO - standard).
J1
J1J2
J3
wa
wb
Sc
x
1
2
3
4
5
Anti-rotation system


Relationships to be known
For each motor revolution cylinder moves x millimetres, x defined as
follows:
ph
x= –––
r
xCylinder move
phRoller or ball screw lead
Depending on case, rdefinition can change:
• Cylinder with motor in line without gear
r= 
• Cylinder with motor in line and gear
r= rgwith rggear ratio
• Cylinder with motor in parallel without gear
r= rbwith rbbelt system ratio
• Cylinder with motor in parallel and gear
r= rb · rg
. Detailed description of supplied product
Generally, a detailed description of the supplied product is given by
the two following documents (called “documents for approval”):
• Technical description
• Cylinder drawing
IMPORTANT: Before starting cylinder commissioning, these two
documents must be read. If there is a problem, please make contact
with your local SKF representative.
. General notes
