
6. Precautions on Selection
1) Confirm the specifications.
Products represented in this manual are designed only for use in compressed air systems.
Do not operate at pressures or temperatures, etc., beyond the range of specifications, as this
can cause damage or malfunction. (Refer to the specifications.)
Please contact SMC when using a fluid other than compressed air made by pneumatic
equipment.
2) Intermediate stops
When intermediate stopped position is performed with a 3 position closed center type
directional control valve, it is difficult to achieve accurate and precise stopped positions due to
the compressibility of air.
Furthermore, since valves or cylinders are not guaranteed for zero air leakage, it may not be
possible to hold a stopped position for an extended period of time. Please contact SMC in case
it is necessary to hold a stopped position for an extended period.
3) Keep the speed setting within the allowable energy values for the product.
Operation with a load’s kinetic energy exceeding the allowable value can lead to damage
of the product and cause human injury as well as damage to other equipment and machinery.
4) Provide a shock absorbing mechanism in cases where the product is subjected
to kinetic energy exceeding the allowable value.
Operation exceeding the allowable energy can lead to damage of the product
and cause human injury as well as damage to other equipment and machinery.
5) Do not give excessive force and vibrations from outside.
This compact cylinder consists of precisely machined parts.
External excessive vibrations may cause air leak, malfunction, parts breakage
and deformation, which could result in injury or equipment damage.
7. Precautions on Design
1) There is a danger of sudden action by air cylinders if sliding parts of machinery
are twisted, etc. and changes in forces occur.
In such cases, human injury 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 avoid such dangers.
2) A protective cover is recommended to minimize the risk of personal injury.
If a stationary object and moving parts of a cylinder are in close proximity,
personal injury may occur. Design the structure to avoid contact with the human body.
3) Securely tighten all stationary parts and connected parts so that they will not
become loose.
When a cylinder operates with high frequency or is installed where there is a
lot of vibration, ensure that all parts remain secure.
4) A 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 impact.
Install a deceleration circuit to reduce the speed before cushioning, or install an
external shock absorber to relieve the impact.
In this case, the rigidity of the machinery should also be examined.
5) Consider a possible drop in operating pressure due to a power outage, etc.
When a cylinder is used in a clamping mechanism, there is a danger of work pieces
dropping if there is a decrease in clamping force 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 human injury.
Suspension mechanisms and lifting devices also require consideration for drop prevention.
6) Consider a possible loss of power source.
Measures should be taken to protect against human injury and equipment damage in the event
that there is a loss of power to equipment controlled by air pressure, electricity or hydraulics,etc.