SMC Networks C(D)U Series User manual

Doc. no. ＣＵ＊＊－ＯＭ０００２Ｅ－Ａ
PRODUCT NAME
FREE MOUNT CYLINDER
MODEL/ Series
Ｃ(D)U SERIES
Ｃ(D)UK SERIES
Ｃ(D)UW SERIES
Ｃ(D)UKW SERIES

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Contents
Safety Instructions 2
1. Specifications 4
2. Installation and Handling 6
3. Maintenance 9
4. Basic Circuit for Cylinder Operation 9
5. Troubleshooting 10
S
No. ＣＵ＊＊－ＯＭ０００２Ｅ―Ａ

2/10
Free Mount Cylinder / Series CU
Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition to International Standards (ISO/IEC),
Japan Industrial Standards (JIS)*1) and other safety regulations*2).
*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems
ISO 4413: Hydraulic fluid power -- General rules relating to systems
IEC 60204-1: Safety of machinery -- Electrical equipment of machines (Part 1: General requirements)
ISO 10218-1992: Manipulating industrial robots -- Safety
JIS B 8370: General rules for pneumatic equipment.
JIS B 8361: General rules for hydraulic equipment.
JIS B 9960-1: Safety of machinery – Electrical equipment for machines. (Part 1: General requirements)
JIS B 8433-1993: Manipulating industrial robots - Safety. etc.
*2) Labor Safety and Sanitation Law, etc.
Caution Caution indicates a hazard with a low level of risk which, if not avoided, could result in
minor or moderate injury.
Warning Warning indicates a hazard with a medium level of risk which, if not avoided, could result
in death or serious injury.
Danger Danger indicates a hazard with a high level of risk which, if not avoided, will result in
death or serious injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the equipment or decides its
specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific equipment must
be decided by the person who designs the equipment or decides its specifications based on necessary analysis and test
results. The expected performance and safety assurance of the equipment will be the responsibility of the person who has
determined its compatibility with the product. This person should also continuously review all specifications of the product
referring to its latest catalog information, with a view to giving due consideration to any possibility of equipment failure when
configuring the equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly. The assembly, operation and maintenance of machines
or equipment including our products must be performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
The inspection and maintenance of machinery/equipment should only be performed after measures to prevent falling or
runaway of the driven objects have been confirmed. When the product is to be removed, confirm that the safety measures as
mentioned above are implemented and the power from any appropriate source is cut, and read and understand the specific
product precautions of all relevant products carefully. Before machinery/equipment is restarted, take measures to prevent
unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is to be used in any of
the following conditions.
1) Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to direct sunlight.
2) Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping, vehicles, military,
medical treatment, combustion and recreation, or equipment in contact with food and beverages, emergency stop circuits, clutch
and brake circuits in press applications, safety equipment or other applications unsuitable for the standard specifications
described in the product catalog.
3) An application which could have negative effects on people, property, or animals requiring special safety analysis.
4) Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a mechanical protective
function, and periodical checks to confirm proper operation.

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Free Mount Cylinder / Series CU
Safety Instructions
Caution
The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange specifications
or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance Requirements”.
Read and accept them before using the product.
Limited warranty and Disclaimer
The warranty period of the product is 1 year in service or 1.5 years after the product is delivered.*3)
Also, the product may have specified durability, running distance or replacement parts.
Please consult your nearest sales branch.
For any failure or damage reported within the warranty period which is clearly our responsibility,
a replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage
incurred due to the failure of the product.
Prior to using SMC products, please read and understand the warranty terms and disclaimers
noted in the specified catalog for the particular products.
*3)
Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum pad or
failure due to the deterioration of rubber material are not covered by the limited warranty.
Compliance Requirements
When the product is exported, strictly follow the laws required by the Ministry of Economy, Trade and
Industry (Foreign Exchange and Foreign Trade Control Law).

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φ6φ10 φ16 φ20 φ25 φ32
Rc1/8
Double acting D type 0. 0125
Single acting Ttype 0. 0062
0. 025 0. 05 0. 1 0. 2 0. 3
Note 1)
Double-side
Rubber bum
p
er
0. 0015 0. 02 0. 04 0. 10 0. 15 0. 20
1. Specifications
1-1. Specifications
Bore size
Fluid
Port size
Max. operating pressure
Proof pressure
Ambient and operating
fluid temperature
Piston speed
Allowable kinetic energy J
Lubrication
Bumper
Air
M5x0. 8
0. 7Mpa
1. 05MPa
Without switch: -10 to +70 ℃(No freezing)
With switch: -10 to +60 ℃(No freezing)
50 to 500mm/s
Non-lube
Double-side rubber bumper
Note 1) For the ø6 single-acting spring extended type (CDU(K)6- *T), only the rod side has the rubber bumper.
Note 2) No load: Rod retracted.
+1. 0
0
± 0.8° ± 0.5°
Reed auto switch D-A9*
Solid state auto switch D-M9*
Stroke length tolerance
Note 2)
Non-rotating accuracy of the rod
Allowable rotational torque(Nm)
Auto switch(Option)
Min. operating pressure
(Mpa
φ6φ10, φ16 φ20, φ25, φ32
Single rod C(D)U*-*D 0.12 0.06 0.05
Double rod C(D)UW*-*D 0.15 0.10 0.08
Single acting Single rod C(D)U*-*S, T 0.2 0.15 0.13
Single rod C(D)UK*-*D 0.15 0.10 0.08
Double rod C(D)UKW*-*D 0.18 0.13 0.11
Single acting Single rod C(D)UK*-*S, T 0.23 0.18 0.16
Tube I.D. (mm)
Model
)
Double acting
Double acting
Standard
Non-rotating type
1-2. Theoretical Force
a) Double acting single rod type [C(D)U(K)*-*D]
(N
0. 3 0. 5 0. 7
OUT 28. 3 8.49 14.2 19.8
IN 21. 2 6.36 10.6 14.8
OUT 78. 5 23.6 39.3 55
IN 66.0 19.83346
OUT 201 60.3 101 141
IN 172 51.6 86 121
OUT 314 94.2 157 220
IN 264 79.2 132 185
OUT 491 147 246 344
IN 412 124 206 288
OUT 804 241 402 563
IN 691 207 346 454
Pressure receiving
area(mm
2
)Operating pressure Mpa
ø6
ø10
Bore
size
)
.2
(
mm
)
Rod
O.D.
(
mm
)
Operating direction
ø16
3
4
6
φ32 12
φ20 8
φ25 10

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b) Double acting double rod type [C(D)U(K)W*-*D] (N
0. 3 0. 5 0. 7
φ6 3 6.36 10.6 14.7
φ10 4 19.8 33 46.2
φ16 6 51.6 86 121
φ20 8 79.2 132 185
φ25 10 124 206 288
φ32 12 207 346 484
Pressure receiving area
(mm
2
)
21. 2
66
172
264
412
691
Bore size
(mm) Rod O.D. (mm) Operating pressure Mpa )
c) Spring retracted type [C(D)U(K)*-*S]
(N
0.30.50.
OUT 28. 3 4. 99 10. 7 16. 3
IN -
OUT 78. 5 16. 7 32. 4 48. 1
IN -
OUT 201 45. 6 86.3 126
IN -
OUT 314 73 136 199
IN -
OUT 491 119 218 316
IN -
OUT 804 207 368 529
IN -
12
Note) Prevent load from being applied to the piston rod when the piston rod is being retracted.
4
6
8
10
21
28
34
φ25
φ6
φ10
φ16
φ20
φ32
3
Operating pressure Mpa
3. 5
6. 9
15
Bore size
(mm) Rod O.D. (mm) Operating direction Pressure receiving area
(mm
2
)
)
7
d) Spring extended type [C(D)U(K)*-*T] (N
0.30.50.
OUT -
IN 21. 2 2. 86 7. 10 11. 3
OUT -
IN 66. 0 12. 9 26. 1 39. 3
OUT -
IN 172 37.2 71. 8 106
OUT -
IN 264 58 111 164
OUT -
IN 412 95 178 260
OUT -
IN 691 173 312 420
Note) Prevent load from being applied to the piston rod when the piston rod is being extended.
4
6
8
10
φ20
12
5. 9
11
16
Operating pressure Mpa
1. 6
3. 0
5.9
Pressure receiving area
(mm2)
φ25
φ32
3
Bore size
(mm) Rod O.D. (mm) Operating direction
φ6
φ10
φ16
)
7

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2. Installation and Handling
①There is a possibility of dangerous sudden
action by air cylinders if sliding parts of
machinery are twisted due to external
forces, etc.
In such cases, injury to personnel may occur; e.g., by catching
hands or feet in the machinery, or damage to the machinery
itself may occur. Therefore, the machine should be designed
to operate smoothly and avoid such dangers.
②A protective cover is recommended to
minimize the risk of personal injury.
If a driven object and moving parts of the product are in close
proximity, injury to personnel may occur. Design the system to
avoid all contact with the human body.
③Securely tighten all stationary parts and
connected parts so that they will not
become loose.
When the product operates with high frequency or is installed
where there is a lot of vibration, ensure that all parts remain
secure.
④A deceleration circuit or shock absorber
etc., may be required.
When a driven object is operated at high speed or the load is
heavy, a cylinder’s cushion will not be sufficient to absorb the
shock. Install a deceleration circuit to reduce the speed before
cushioning, or install an external shock absorber to relieve
the shock. In this case, please verify the rigidity of the
equipment carefully.
⑤Consider the possibility of a reduction in the
circuit air pressure caused by a power
failure.
There is a danger of workpieces dropping if there is a
decrease of thrust due to a drop in circuit pressure caused by
a power outage, etc. Therefore, safety equipment should be
installed to prevent damage to machinery and/or injury to
personnel. Suspension equipment and lifting devices also
require measures to prevent dropping.
⑥Consider a possible loss of power source.
Measures should be taken to prevent injury and equipment
damage in the event that there is a power malfunction to
equipment controlled by air pressure, electricity or hydraulics,
etc.
⑦Design a circuit to prevent sudden action of
a driven object.
Design a circuit and choose equipment to prevent quick
extension, which may cause injury to personnel or damage to
machinery, in the following cases:
activating the cylinder with the exhaust centre type direction
control valve starting after the circuit’s residual pressure has
been emitted pressure is added to one side of the piston from
air within a cylinder
！Warning
2-2 Selection
！Warning
①Confirm the specifications.
The product is designed only for use in industrial compressed air
systems. Do not operate at pressures or temperatures, etc., beyond
the range of specifications, as this can cause damage or malfunction.
Please contact SMC if using for other fluids than compressed air.
②Intermediate stop
Due to the compressibility of air it is difficult for this product to make a
piston stop at the required intermediate position accurately and
precisely by using a 3 position closed center type directional control
valve. Furthermore, since valves and cylinders are not guaranteed
for zero air leakage, it may not be possible to hold a stopped position
for extended periods of time. Contact SMC if it is necessary to hold the
stopped position for extended periods of time.
①Operate the product within a range such that the
piston will not collide and be damaged at the
stroke end.
For applications where the piston with inertia force is expected to stop
by colliding with the cover at the stroke end, use it within a range that
will not cause damage (within the allowable kinetic energy).
②Use a speed controller to adjust the cylinder
drive speed, gradually increasing from a low
speed to the desired speed setting.
③When a load is mounted to the rod end, adjust
the speed corresponding to the load mass.
Refer to the catalog for details.
!Caution
2-1 Design
⑧Consider emergency stop.
Design the system to prevent injury to personnel and damage to
machinery and equipment when it is stopped by a safety device for a
power outage or manual emergency stop.
⑨ Consider the action when the operation is
restarted after an emer
g
enc
y
stop or abnormal
stop.
Design the machinery so that injury to personnel or equipment
damage will not occur upon restart of operation. when the cylinder has
to be reset at the starting position.install manual safety equipment.

7/10
2-4 Piping
① Use clean air.
Do not use compressed air which contains chemicals, synthetic oils
containing organic solvents, salts or corrosive gases, etc., as this can
cause damage or malfunction.
②Install an air filter.
Install an air filter upstream near the valve.
A filtration degree of 5 micron millimeter or less should be selected.
③Take appropriate measures to ensure air qualit
y
,
such as b
y
providin
g
an after cooler, air dr
y
er, or
water separator.
Do not use compressed air containing a lot of condensate, which
can cause the operating failure of the product and other pneumatic
equipment.
④Ensure that fluid and ambient temperature are
within the specified range.
When operating at temperatures below 5oC, moisture in the circuit
may freeze and cause breakage of seals or malfunction. Corrective
measures should be taken to prevent freezing.
For detailed information regarding the quality of the compressed air
described above, refer to SMC's Cleaning Systems".
!Warning
① Do not use in environments where there is a
danger of corrosion.
Refer to the construction drawings regarding cylinder materials.
② Install a cover over the rod if it is used in an area
that is dusty, or in an environment in which
water or oil splashes on the cylinder.
③ An area exposed to direct sunlight.
①Be sure to connect the piston rod and the
load so that their axial centers and
movement directions match.
When not axially aligned, stress could be applied to the piston
rod and the cylinder tube, causing the inner surface of the
cylinder tube, the bushing, the piston rod surface, and the seals
to wear and become damaged.
②Do not scratch or dent the slidin
g
parts of
the c
y
linder tube or piston rod etc., b
y
striking them with other objects.
Cylinder bores are manufactured to precise tolerances, so that
even a slight deformation may cause malfunction. Also,
scratches or gouges, etc., in the piston rod may lead to
damaged seals and cause air leakage.
③Tightening torque
When the free-mount cylinder is mounted, refer to
the table below.
!Caution
2-6 Air Supply
2-7 Operating environment
!Cauti no
!Caution
!Warning
!Caution
2-5 Lubrication
2-3 Mounting
① Lubrication of non-lubricating cylinder
The product has been lubricated for life at the time of manufacture, and
does not require lubrication in service. If a lubricant is used in the system,
use turbine oil Class 1 (with no additive) ISO VG32.
Bore size
(mm) Hexagon socket head cap screw (mm) Appropriate tightening torque (Nm)
6, 10 M3 1.08±10%
16 M4 2.45±10%
20, 25 M5 5.10±10%
32 M6 8.04±10%

④Do not use the product until
y
ou have verified
that the equipment can operate properly.
After mounting, repair or modification, etc., connect the air
supply and electric power, and then confirm proper mounting by
means of appropriate function and leak inspections.
⑤Operation Manual
Install and operate only after reading the operation manual
carefully and understanding the contents. Keep the manual in a
safe place for future reference.
①Before piping
Before piping, perform air blow (flushing) or cleaning to remove
any cutting chips, cutting oil, dust, etc. from the piping.
②Sealant tape
When screwing piping or fittings into ports, ensure that chips from
the pipe threads or sealing material do not enter the piping. Also,
if pipe tape is used, leave 1.5 to 2 thread ridges exposed at the
end of the threads.

8/10
①Maintenance should be performed accordin
g
to the procedure indicated in the Operatin
g
Manual.
Improper handling can cause damage and malfunction of
equipment and machinery.
②Machine maintenance, and suppl
y
and exhaust
of compressed air
Before components are removed, first confirm that measures are
in place to prevent work pieces from dropping and/or equipment
moving or running away, etc. Disconnect the air supply pressure,
electrical power, and exhaust all compressed air from the system.
When machinery is restarted, check that operation is normal with
actuators in the proper positions.
!Caution
③Drain flushing
Remove condensate from air filters regularly.
①Do not place
y
our fin
g
ers in the clearance between
the non-rotating plate and the cylinder tube.
There is a danger that fingers of personnel could get caught between
the
non-rotating plate and cylinder tube when the piston rod retracts.
Therefore, never place your hand in this area. Be careful not to get a
finger
caught by the cylinder,as the cylinder outputs great force, it can lead to
injury.
②Do not use in a way that may cause a bendin
g
moment to be added to the rod.
(
Refer to the Fi
g
.
shown below)
Precaution on Proximity installation
When the universal mounting cylinders with D-A9 or D-M9
auto switch are used, the auto switch could activate
unintentionally if the cylinder installed distance is less than the
dimension shown in the table. Therefore, make sure to provide
a longer distance than the specified dimension. If the distance
between the cylinders must be shorter than the dimension
given in the table, affix a steel plate or a magnetic shield plate
(MU-S025) to the area on the cylinder which is opposite to the
auto switch mounted on another cylinder. (Please inquire for
more details)
The auto switch without the shield plate may cause
malfunction.
Table 1 (mm)
2-8 Maintenance
2-9 Auto Switch Mounting Precautions
!Caution
2-10 Precautions
!Warning
!Caution
Tube I.D. (mm) d L
6 5
18
10 5 20
16 13 33
20
d
14 40
L
25 14 46
32 16 56

9/10
3. Maintenance
!Caution
As a jig is required for bore size ø6, do not disassemble when replacing seals etc.
If overhaul is required, contact SMC Sales Office.
Checks
1.Daily check
1)Whether the operation is smooth or not.
2)Changes in piston speed and cycle time.
3)Whether the stroke is appropriate or not.
2.Regular inspection
1)Loosening of the cylinder mounting screw
2)Whether the operation is smooth or not.
3)Changes in piston speed and cycle time.
4)External leakage
5)Whether the stroke is appropriate or not.
6)If there are any scratches on the piston rod, and the grease condition.
7)Whether drainage in the air filter is regularly discharged or not.
Check the points above at least, and contact the sales representative if any failure is found.
4. Basic Circuit for Cylinder Operation
The basic circuit for operating the product with air filter, regulator, solenoid valve and speed controller is shown in the
following figure.
Regulator
Speed controller
Solenoid valve
Air c
y
linder
Air filter Pressure sorce
For a double-acting cylinder, use a meter-out speed controller
For a single-acting cylinder, use a meter-in speed controller.
Open the speed controller gradually from the fully closed position to adjust the speed.
Do not adjust the speed starting with the speed controller in the fully open position,
otherwise, damage may occur due to the piston striking the end cover at high speed.

10/10
5.Troubleshooting
Description Possible causes Countermeasures Note
Insufficient
output
The piston seal is
worn out. Replace the piston seal. For ø6, request SMC to repair.
Operating
speed is too
slow.
The load is too much for
the cylinder output.
・Increase the bore size of the
cylinder.
The cylinder operating
speed is out of the range.
・Change the cylinder speed to be
within the allowable range.
・Use a low speed cylinder.
・Increase the bore size of the
cylinder.
The lateral load to the
cylinder is over the
allowable range.
・Change the lateral load to be
within the allowable range.
・Increase the bore size of the
cylinder.
・Use a guide cylinder.
Vibration is detected. ・Install the product in a place where
it is not applied with vibration.
・Avoid applying external force to
the product.
Operation is
not smooth.
Water or coolant liquid is
splashed.
・Protect the cylinder with a cover to
avoid liquid splash.
Deformation
or breakage
Impact force due to high
speed operation
・Reduce the cylinder speed to be
within the allowable range.
・Reduce the load.
・Install an external impact
absorbing mechanism.
The auto switch is not
mounted in the proper
mounting position.
・Install the auto switch at the
correct position.
・Mount to proximity installation
position.
The auto
switch does
not operate.
(Malfunctions.)
・The cylinders are
mounted side by side.
・Put magnetic shielding plates
(MU-S025) between the cylinders
which are installed in parallel.
Refer to Mounting
Auto Switch
(Precaution on
proximity installation)

Revision history
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: [phone]
URL http://www.smcworld.com
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
© 2008 SMC Corporation All Rights Reserved
No. ＣＵ＊＊－ＯＭ０００２Ｅ―Ａ