Pneumatic Clean Series

207Rotary Actuator/Common Precautions 1Be sure to read before handling. Refer to pages 7 to 16 of Front matter for safety instructions andcommon precautions for clean series. Refer to the main text for precautions for each series.WarningDesignqIf the operation involves load fluctuations, ascending ordescending movement or changes in frictional resistance,devise a safety design considering these factors.Rise in temperature may cause injury to humans or damage toequipment and machinery.wInstall a protective cover to minimize the risk ofinjury in case it is especially likely that human injurymay be caused.If there is any possibility of human injury or damage tomachinery and equipment caused by the driven object or themovable part of the product, adopt a construction that will notallow direct contact with that part.eSecurely tighten all stationary parts and joints sothat they will not go loose.In case the product is operated at a high frequency or in aplace with a lot of vibration, adopt a reliable securing method.rDeceleration circuits or shock absorbers may benecessary.If the driven object moves at a high speed or has a heavyweight, it is difficult to absorb the impact with the rotary actuatorcushion alone. Install a deceleration circuit to reduce the speedbefore cushioning or install an external shock absorber tomoderate the impact. In this case, the rigidity of the machineryshould also be considered.tConsider possible drops circuit pressure due topower failure or some other factors.In case the cylinder is used in a clamping mechanism, a drop incircuit pressure may result in a decrease of the clamping forceand consequently dropping of the work piece.Install safety equipment to protect the human body ormachinery against injury or damage.yConsider a possible loss of power source.If the product is controlled by pneumatic pressure, electricity orhydraulic pressure, take measures against possible failure ofthe power source so that the failure will cause no human injuryor damage to equipment.uWhen the speed controller is arranged for meter-outcontrol, take the residual pressure into account forsafety design.If pressure is applied to the supply side with no residualpressure on the exhaust side, it can cause injury to humans ordamage to machinery and equipment.iConsider the behavior at an emergency stop.Design a system that will prevent human injury or equipmentdamage caused by the rotary actuator movement when themachine is halted by a manual emergency stop or by a safetydevice detecting abnormality such as power failure.oConsider the behavior on restart after an emergencystop or abnormal stop.Design a system so that no damage to human or equipment willbe caused on restart of operation.When the rotary actuator has to be reset at the startingposition, install manual safety equipment.!0Do not use the product as a shock absorber.If an abnormal pressure is generated or air leakage occurs, therotary actuator's speed reduction capability could be severelyaffected, which could cause injury to humans or damage tomachinery and equipment.WarningSelectionqSelect the speed within the product's allowableenergy value.If the product is operated with a kinetic energy exceeding theallowable value, it may cause injury to humans or damage tomachinery and equipment.wProvide a shock absorbing mechanism If the kineticenergy applied to the product exceeds the allowablevalue.If the product is used in a state in which the kinetic energyexceeds the allowable value, it could damage the product,causing injury to humans or damage to machinery andequipment.eDo not perform an intermediate stop or retention bycontaining air inside the product.In case the product is not provided with an external stopmechanism, stopping the product at an intermediate positionby containing air inside may result in air leakage, making itimpossible to hold the stop position. It can lead to injury tohumans or damage to machinery and equipment.CautionqDo not operate the product in a low speed rangebelow the specified speed adjustment range.If the product is used in a low speed range below the specifiedspeed adjustment range, it could cause a stickslipphenomenon or operation stop.wDo not apply external torque exceeding the ratedoutput to the product.The product may be damaged if an external force exceedingthe rated output is applied.eThe holding torque of the rotation end of the doublepiston style.With a double piston product, if the internal piston is stoppedby coming into contact with the angle adjustment screw or thecover, the holding torque at the rotating end is one-half that ofthe actual product.rIf repeatability of the rotation angle is required, stopthe load directly with external force.The initial rotation angle may vary even with a productequipped with an angle adjuster.tDo not operate the product with hydraulic pressure.Use of hydraulic pressure will lead to product damage.yIf it is necessary to ensure a rotation angle with avane style product, be sure to operate at a pressurenot smaller than 0.3MPa.188