Translation of the original instructions
1 Further applicable documents
All available documents for the product èwww.festo.com/pk.
2 Safety
2.1 Allgemeine Sicherheitshinweise
– 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.
– Observe further applicable documents.
– 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 conducted by qualified personnel.
3 Further information
– Accessories èwww.festo.com/catalogue.
– Spare parts èwww.festo.com/spareparts.
4 Service
Contact your regional Festo contact person if you have technical questions
èwww.festo.com.
4.1 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 piston rod at both ends
The position of the piston can be sensed by proximity sensors.
4.2 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
Cross hole for mounting
5
Male thread on the end cap for
mounting
Fig. 1 Design of DSNU
CRDSNU
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
Cross hole for mounting
Fig. 2 Design of CRDSNU
4.3 Installation
• Handle the cylinder so as to avoid any damage to the cylinder barrel and piston rod.
• Observe the following points:
– Parallel installation when using external guides
– Warp-free installation
– Compliance with the permissible loads as per catalogue specifications
• Observe tightening torque of lock nuts on the male thread2
è Tab. 1 Tightening torque on the bearing/end cap.
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
CRDSNU
Tightening torque
on the bearing cap
[Nm] – 15 15 40 40 60 80 100 100
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.
4.4 Mounting accessories
In the case of a large payload, high piston speed or when using quick exhaust
valves:
8094773
DSNU/CRDSNU
Round cylinder
8094773
2018-07a
[8094775]
Instructions| Operating
Festo AG & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
• Use suitable shock absorbers or external stops.
To prevent the payload from sliding down suddenly in the event of an air supply
failure in a horizontal or sloping mounting position:
• Use piloted check valves.
To set the speed:
• Use one-way flow control valves in the supply ports:
– Single-acting cylinders: GRLZ (supply air flow control)
– Double-acting cylinders: GRLA (exhaust air flow control)
The one-way flow control valves are screwed directly into the supply ports. Use of
other accessories with a screw-in depth that is too long will damage the cushioning piston.
For position sensing with proximity sensors:
• Use proximity sensors with mounting kit.
Avoid external influence caused by magnetic or ferritic parts in the vicinity of
the proximity sensors (spacing³10mm).
5 Pneumatic installation
• Connect hoses to supply ports3.
6 Commissioning
6.1 Preparation
• Pressurise the entire system slowly. For slow start-up pressurisation use a
soft-start valveèwww.festo.com/catalogue.
With medium or large payloads or at high speeds:
• Use sufficiently large arrester fixtures. Without external arrester fixtures, the
product will tolerate the maximum speeds and payloads set out in the catalogue specifications.
6.2 Execution
NOTICE!
Risk of collision due to payloads that project into the setup region of the product.
• Only turn adjusting screws while the product is stationary.
1. At both ends, fully close the one-way flow control valves and setting screws
present for the end-position cushioning, then unscrew by one complete turn.
Note that adjustable end-position cushioning may not be effective in combination with screwed-in quick exhaust valves. This depends on the flow conditions of the exhaust air.
2. Pressurise the cylinder simultaneously at both ends.
Ä
The piston rod moves slightly to a point of balance.
3. Exhaust the cylinder at one end.
Ä
The piston rod moves to an end position.
4. Start the test run.
5. If the piston rod strikes hard against the end positions or rebounds, correct
the following:
– Speed via the one-way flow control valves
– End-position cushioning via the setting screws
7 Cleaning
NOTICE!
• Do not use aggressive cleaning agents.
• Do not clean the guide elements. Regularly removing the lubricant from the
surface of the piston rod reduces the service life.
• Clean the product with a soft cloth.
The cylinder is furthermore maintenance-free owing to the lifetime lubrication.
8 Fault clearance
Fault description Cause Remedy
Lack of lubricant. Grease with lubricant (as per
wearing parts sheet
èwww.festo.com/spareparts
).
One-way flow control valves are
controlling the flow of supply
air.
Control flow of exhaust air, if
possible (not supply air).
Piston rod is dirty. – Clean the cylinder.
– Provide covering (relubric-
ate after in-depth cleaning).
Insufficient supply air (stick
slip)
– Keep the tubing short and
select suitable cross-sec-
tions.
– Select correct pressure.
– Keep pressure constant.
Pressure is too low. Connect volume upstream.
Piston seal or piston rod seal is
defective.
Replace wearing parts
èwww.festo.com/spareparts.
Irregular movement of the piston rod (cylinder jolts).
Guide is not parallel to direction
of stroke.
Use self-aligning rod coupler as
in accessories
èwww.festo.com/catalogue.
Fault description Cause Remedy
Cylinder barrel is damaged. Replace cylinder.
Setting screw for end-position
cushioning is completely
closed.
Loosen setting screw.
Foreign matter in the cylinder. Filter the compressed air.
Piston does not travel to end
position.
Cylinder travels to an external
end stop.
Readjust the end stop.
Temperatures too high or too
low.
Comply with permissible temperature range of the proximity
sensors.
False triggering during position
sensing
Fault on proximity sensor è Instruction manual for prox-
imity sensor
Tab. 2
9 Disposal
ENVIRONMENT!
Send the packaging and product for environmentally sound recycling in accordance with the current regulations èwww.festo.com/sp.
10 Technical data
DSNU-8…25
Size 8 10 12 16 20 25
Pneumatic connection M5 M5 G1/8
Piston rod thread M4 M6 M8 M10x
1.25
Elastic cushioning rings/plates, at both ends (P cushioning)
– Pneumatic cushioning, can be adjus-
ted at both ends (PPV cushioning)
End-position cushioning
– Pneumatic cushioning, self-
adjusting at both ends (PPS
cushioning)
Mounting position Any
Operating medium Compressed air to ISO 8573-1:2010 [7:4:4]
Notes on the
operating/pilot medium
Lubricated operation possible (in which case lubricated
operation will always be required)
Operating pressure
DSNU-... [bar] 1.5…10 1…10
DSNU-...-S10 [bar] – 1.5…10 1…10
DSNU-...-S11 [bar] – 0.45…
10
0.3…10
Ambient temperature
DSNU-... [°C] –20…+80
DSNU-...-S6 [°C] 0…+120
DSNU-...-S10/-S11 [°C] +5…80
Theoretical force at6bar,
advance
[N] 30 47 68 121 189 295
Theoretical force at6bar,
return
[N] 23 40 51 104 158 247
Basic weight [g] 34.6 37.3 75 89.9 186.8 238
Additional weight per 10mm
stroke
[g] 2.4 2.7 4 4.6 7.2 11
Tab. 3 Technical data for DSNU-8 to DSNU-25
DSNU-32…63
Size 32 40 50 63
Pneumatic connection G1/8 G1/4 G3/8
Piston rod thread M10x1.25 M12x1.25 M16x1.5
Elastic cushioning rings/plates, at both ends (P cushioning)
Pneumatic cushioning, can be adjusted at both ends (PPV
cushioning)
End-position cushioning
Pneumatic cushioning, self-adjusting at both ends (PPS
cushioning)
Mounting position Any
Operating medium Compressed air to ISO 8573-1:2010 [7:4:4]
Notes on the
operating/pilot medium
Lubricated operation possible (in which case lubricated
operation will always be required)
Operating pressure
DSNU-... [bar] 1…10
DSNU-...-A6 [bar] 2…10
DSNU-...-S10 [bar] 0.5…10 0.4…10
DSNU-...-S11 [bar] 0.2…10
Ambient temperature
DSNU-... [°C] –20…+80
DSNU-...-S6 [°C] 0…+120
DSNU-...-S10/-S11 [°C] +5…80
Theoretical force at6bar,
advance
[N] 483 753 1178 1870
Theoretical force at6bar,
return
[N] 415 633 990 1682
Basic weight [g] 370.5 661 1087 1445
Additional weight per 10mm
stroke
[g] 15.5 24 40 44
Tab. 4 Technical data for DSNU-32 to DSNU-63
CRDSNU
Size 12 16 20 25 32 40 50 63
Pneumatic connection M5 G1/8 G1/4 G3/8
Piston rod thread M6 M8 M10x1.25 M12-
x1.25
M16x1.5
Elastic cushioning rings/plates, at both ends (P cushioning)
– Pneumatic cushioning, self-adjusting at both ends
(PPS cushioning)
End-position cushioning
– Pneumatic cushioning, can be adjusted at
both ends (PPV cushioning)
Mounting position Any
Operating medium Compressed air to ISO 8573-1:2010 [7:4:4]
Notes on the
operating/pilot medium
Lubricated operation possible (in which case lubricated
operation will always be required)
Operating pressure [bar] 1…10
Ambient temperature
CRDSNU-... [°C] –20…+80
CRDSNU-...-A1 [°C] 0…+80
CRDSNU-...-S6 [°C] 0…+120
CRDSNU-...-TT [°C] –40…+80
Theoretical force at6bar,
advance
[N] 68 121 188 295 483 754 1178 1870
Theoretical force at6bar,
return
[N] 51 104 158 247 415 633 990 1682
Basic weight [g] 101 130 310 410 670 1327 2020 2943
Additional weight per 10mm
stroke
[g] 4 5 7 11 15 24 40 44
Tab. 5 Technical data for CRDSNU
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