SMC Networks C(D)U Series Operation Manual - page 7
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2. Installation and Handling
① There 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.
②
A 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.
③ Securely 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.
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
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.
⑤ Consider 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.
⑥ Consider 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.
⑦ Design 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
① Confirm 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.
② Intermediate 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.
① Operate 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
⑧ Consider 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 emergency 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.