Festo DSNU-S Instructions

DSNU(-S)
Round cylinder
Instructions | Operating
8118579
2020-03b
[8118581]
Translation of the original instructions
© 2020 all rights reserved to Festo SE & Co. KG
1

Applicable documents

All available documents for the product è www.festo.com/sp.
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 www.festo.com/catalogue.
– Spare parts è www.festo.com/spareparts.
4

Service

Contact your regional Festo contact person if you have technical questions
è www.festo.com.
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
DSNU
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
8118579
1 Male thread on the piston rod for
mounting the payload
2 Male thread on the bearing cap 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
Fig. 2 Design of DSNU-S
5.3
• Handle the cylinder so as to avoid any damage to the cylinder barrel and pis-
ton rod.
• Observe the following points:
–
–
–
• Observe tightening torque of lock nuts on the male thread 2.
Size
DSNU
Tightening torque
on the bearing cap
Tightening torque
on the end cap
DSNU-S
Tightening torque
on the bearing cap
Tightening torque
on the end cap
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:
–
–
–
A rigid coupling impairs the service life and function of the cylinder.
5.4
In the case of a large payload, high piston speed or when using quick exhaust
valves:
• Use suitable shock absorbers or external stops.

Design

Installation
Parallel installation when using external guides
Installation without distortion
Compliance with the permissible loads è www.festo.com/catalogue
8 10 12
[Nm] 10 10 20
[Nm] 4.6 4.6 10.8 10.8 20.7 20.7 21.5 25.1 30.9 30.9
[Nm] 5 – 11
[Nm] – – –
Absolutely precise alignment (general)
Use of a self-aligning rod coupler FK
Use of a guide unit FEN with compensating coupling
Mounting Accessories
3 Supply ports in the bearing/end
cap
4 Male thread on the end cap for
mounting
5 Cross hole for mounting
3 Supply ports in the bearing/end
cap
4 Male thread on the end cap for
mounting (size 20, 25 only)
16 20 25 32 40 50
20 40 40 60 80 100
11 35 35 – – –
– 35 35 – – –
63
100
–
–