Translation of the original instructions
© 2020 all rights reserved to Festo SE & Co. KG
1
Applicable documents
All available documents for the product
è
2
Safety
2.1
Safety Instructions
–
Take into consideration the ambient conditions at the location of use.
–
Only use the product in original status without unauthorised modifications.
–
Observe labelling on the product.
–
Store the product in a cool, dry, UV-protected and corrosion-protected envir-
onment. Ensure that storage times are kept to a minimum.
–
Prior to mounting, installation and maintenance work: Switch off compressed
air supply and secure it from being switched back on.
–
Observe tightening torques. Unless otherwise specified, the tolerance is
± 20 %.
2.2
Intended use
The product is intended for the transport of loads.
2.3
Training of skilled personnel
Installation, commissioning, maintenance and disassembly should only be con-
ducted by qualified personnel.
3
Further information
–
Accessories
è
–
Spare parts
è
4
Service
Contact your regional Festo contact person if you have technical questions
è
5
Product overview
5.1
Function
The piston rod moves outwards when the cylinder chamber is pressurised. The
advanced piston rod is retracted as follows:
–
For single-acting cylinders, by means of the integrated return spring.
–
For double-acting cylinders, by pressurising the other cylinder chamber.
The cylinder force during advance and return is:
–
different with piston rod at one end.
–
identical with through piston rod.
The position of the piston can be detected by proximity sensors.
5.2
Design
DSNU
1 Male thread on the piston rod for
mounting the payload
2 Male thread on the bearing cap for
mounting
3 Supply ports in the bearing/end
cap
4 Male thread on the end cap for
mounting
5 Cross hole for mounting
Fig. 1 Design of DSNU
DSNU-S
1 Male thread on the piston rod for
mounting the payload
2 Male thread on the bearing cap for
mounting
3 Supply ports in the bearing/end
cap
4 Male thread on the end cap for
mounting (size 20, 25 only)
Fig. 2 Design of DSNU-S
5.3
Installation
•
Handle the cylinder so as to avoid any damage to the cylinder barrel and pis-
ton rod.
•
Observe the following points:
–
Parallel installation when using external guides
–
Installation without distortion
–
Compliance with the permissible loads
è
•
Observe tightening torque of lock nuts on the male thread
2
.
Size
8
10
12
16
20
25
32
40
50
63
DSNU
Tightening torque
on the bearing cap
[Nm]
10
10
20
20
40
40
60
80
100
100
Tightening torque
on the end cap
[Nm]
4.6
4.6
10.8
10.8
20.7
20.7
21.5
25.1
30.9
30.9
DSNU-S
Tightening torque
on the bearing cap
[Nm]
5
–
11
11
35
35
–
–
–
–
Tightening torque
on the end cap
[Nm]
–
–
–
–
35
35
–
–
–
–
Tab. 1 Tightening torque on the bearing/end cap
•
Avoid mechanical alignment inaccuracies between the piston rod and an
external guide using one of the following measures:
–
Absolutely precise alignment (general)
–
Use of a self-aligning rod coupler FK
–
Use of a guide unit FEN with compensating coupling
A rigid coupling impairs the service life and function of the cylinder.
5.4
Mounting Accessories
In the case of a large payload, high piston speed or when using quick exhaust
valves:
•
Use suitable shock absorbers or external stops.
8118579
DSNU(-S)
Round cylinder
8118579
2020-03b
[8118581]
Instructions | Operating
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
