３－３．Speed adjustment
The cylinder can be adjusted to desired speed by SMC’s speed controller, AS series. There are two ways to
do it depending on the port of the cylinder which restricts the supplied air, supply or exhaust port. However,
it should be noted normally the air is restricted at exhaust port.
Caution
１） Use a speed controller to adjust the cylinder drive speed, gradually increasing from a low
speed to the desired speed setting.
２) Perform speed adjustment in the actual operating conditions.
If it is performed under different conditions, it might deviate.
３－４．Direction control
The cylinder can be switched in movement direction by an SMC solenoid valve, which is selected from
various styles for the optimum performance of the cylinder.
Warning
１） Design circuitry to prevent sudden lurching of driven objects.
When a cylinder is driven by an exhaust center type directional control valve or when starting up after
residual pressure is exhausted from the circuit, etc., the piston and its driven object will lurch at high
speed if pressure is applied to one side of the cylinder because of the absence of air pressure inside the
cylinder. Therefore, equipment should be selected and circuits designed to prevent sudden lurching,
because there is a danger of human injury and/or damage to equipment when this occurs.
３－５．Caution on Design
Warning
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, 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 adjusted to operate smoothly and 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.
Especially when a cylinder operates with high frequency or is installed where there is a lot of vibration,
ensure that all parts remain secure.
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