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Doc. No.CRA1-OM00004
PRODUCT NAME
Rotary Actuator with Solenoid valve
MODEL
CVRA1 Series
○ Thoroughly read and understand this operation manual to install and operate this product.
○ Pay particular attention to the safety statements.
○ Retain this operation manual to read whenever needed.
Table of Contents
Safety Instructions
Outline
Specification
Effective torque
Rotation range of Keyway and How to adjust the rotation speed
How to adjust the Air cushion
Internal structure and parts description
Rotary Actuator with solenoid valve internal structure
Mounting
Restriction of the load
Operation of shaft couplings
Piping and operating direction
Operating air
Setting rotation time
Moment of inertia
Table fir calculation of Inertia moment
Kinetic energy
External stopper
Calculation of required torque
Type of auto switch
Auto switch specification
Auto switch set position and operating range
Auto switch working principle
Maintenance and Inspection
Periodic inspection
Replacement part
Disassembling procedure
Assemble procedure
Trouble shooting
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CRA1 Series
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)
*1)
, and other safety regulations.
*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.
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.
1.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.
2.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.
3.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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CRA1 Series
Safety Instructions
Caution
1.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
1.The warranty period of the product is 1 year in service or 1.5 years after the product isdelivered.
∗∗∗∗
2)
Also, the product may have specified durability, running distance or replacement parts.
Please consult your nearest sales branch.
2. 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.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers noted in the specified catalog for the particular products.
∗∗∗∗
2)
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
1. The use of SMC products with production equipment for the manufacture of weapons of mass destruction(WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are govemed by the relevant security laws and regulation of the countries involved in the transaction. Prior to the shipment of a SMC product to another country, assure that all local rules goveming that export are known and f ollowed.
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Design
Warning
① If the operation involves load fluctuations, ascending/descending movements, or changes in friction resistance, make sure to provide safety measures.
Operating speed will increase, and bodily injury may occur, or damage to the machinery itself
② may occur.
② If there is a chance that the product will pose a hazard to humans, install a protective cover.
If the moving portion of the product will pose a hazard to humans or will damage machinery or
③ equipment, provide a construction that prevents direct contact with those areas.
③ Be certain that the secured portions will not loosen.
Be certain to adopt a reliable connecting method if the rotary actuator is used very frequently or if it is used in a location that is exposed to a large amount of vibration.
④ Consider the possibility of a reduction in the circuit air pressure caused by a power failure.
When an actuator is used as clamping mechanism, there is a danger of workpiece dropping if there is a decrease in clamping force, due to a drop in circuit pressure caused by a power failure. Therefore, safety equipment should be installed to prevent damage to machinery and bodily injury.
⑤ Consider the possibility of power source related malfunctions that could occur.
For the equipment that rely on power sources such as compressed air, electricity, or hydraulic pressure, adopt a countermeasure to prevent the equipment from causing a hazard to humans or damage to the equipment in the event of malfunction.
⑥ Consider the behavior of the rotary actuator in the event of an emergency stop.
Devise a safe system so that if a person engages the emergency stop, or if a safety device is tripped during a system malfunction such as a power failure, the movement of the rotary actuator will not cause a hazard to humans or damage the equipment.
⑦ Consider the action of the rotary actuator when restarting after an emergency stop.
Devise a safe design to that the restarting of the rotary actuator will not pose a hazard to humans or damage the equipment. Install manually controlled equipment for safety when the actuator has to be reset to the starting position.
⑧ Do not use the product as a shock absorber.
If an abnormal pressure or air leakage occurs, the rotary actuator’s speed reduction capability could become severely effected, which could pose a hazard to humans and damage the machinery and equipment.
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Selection
Warning
① Confirm the specifications
Rotary actuator is designed only for use in industry 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.
We do not guarantee against any damage if the product is used outside of the specification range.
② Select a speed within the product’s allowable energy value.
If the product’s kinetic energy of the load exceeds the allowable value, it could damage the product, and cause a hazard to humans and damage the machinery and equipment.
③ Provide a shock absorber if the kinetic energy that is applied to the product exceeds the allowable value.
If the product’s kinetic energy exceeds the allowable value, it could damage the product, and cause a hazard to humans and damage the machinery and equipment.
④ Do not stop or hold the product at midpoint by keeping air pressure in the product.
For a product lacking an external stopping mechanism, if the directional control valve is closed to keep the air pressure in the product, in an attempt to stop the product at midpoint, it might not be possible to maintain that stopped position due to an air leakage. As a result, it could pose a hazard to humans and damage the machinery and/or equipment.
⑤ Do not use two or more rotary actuators with the aim of synchronized movement.
One of the actuators may bear the load of operation, making synchronized movement impossible, and possibly leading to deformation of the equipment.
⑥ Do not use in a location where adverse effect could be occurred by the oozing of the lubricant to the exterior.
The lubricant coating the interior of the product may leak to the outside of the product from the portion of the connection of the rotary shaft, body cover, etc.
Caution
① Do not use below the speed adjustment range specified for the product.
If the product is used below the specified speed adjustment range, it could cause the product to stick, slip, or the movement to stop.
② Do not apply an external torque to the product that exceeds the rated output.
If an external force that exceeds the product’s rated output is applied to the product, it could damage the product.
③ If it is necessary to provide repeatability of the rotation angle, directly stop the load externally.
Even with a product that is equipped with an angle adjuster, there are times in which the initial rotation angle could change.
④ Do not use under hydraulic pressure.
The product will be damaged if it is used by applying hydraulic pressure.
⑤ Do not use in places where there are many temperature fluctuations. When using in lower temperature applications, use caution so that frost does not occur inside the cylinder or the piston rod.
Operation may be unstable.
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⑥ Adjust the speed control in the environment in which it will be used in.
Speed adjustment may be changed if the environment is different.
Mounting
Warning
① Ensure sufficient space for maintenance activities.
When installing the products, allow access for maintenance.
② Before adjusting the angle by supplying air pressure, take appropriate measures to prevent the equipment from rotating unnecessarily.
When an adjustment is performed under air pressure, the equipment could rotate and fall during the adjustment, depending on the mounted placement of the equipment. As a result, it could pose a hazard to humans and damage the machinery and equipment.
③ Do not loosen the angle adjustment screw beyond the allowable adjustment range.
The angle adjustment screw could fall out if it is loosened beyond its allowable adjustment range and cause a hazard to humans and damage to machinery and equipment.
④ Do not place a magnetic object near the product.
The auto switch is a magnetic sensing type. If a magnetic object is placed close to it, the rotary actuator could operate suddenly, which could pose a hazard to humans and damage the machinery and equipment.
⑤ Do not perform additional machining to the product.
Additional machining to the product can result in insufficient strength and cause damage to the product. This can lead to possible human injury and damage to the surrounding equipment.
⑥ Do not enlarge the fixed throttle by modifying the pipe connectors.
If the hole diameter is enlarged, the product’s rotation speed will increase, causing the shock force to increase and damage to the product. As a result, it could pose a hazard to humans and damage the machinery and equipment.
⑦ If shaft couplings are used, use those with angular freedom.
If shaft couplings that lack angular freedom are used, they could scrape due to eccentricity, leading to equipment malfunction and product damage. As a result, it could pose a hazard to humans and damage the machinery and equipment.
⑧ Place an external stopper in a position that is away from the rotating shaft.
If the stopper is placed near the rotating shaft, the torque that is generated by the product itself will cause the reaction force which is directed to the stopper to be redirected and applied to the rotating shaft. This will lead to the breakage of the rotating shaft and bearing. As a result, it could pose a hazard to humans and damage the machinery and equipment.
Backlash of the Single Rack Pinion Type CRA1 Series
There is a backlash of within 1 ° at the rotation end of the CRA1 series. It is necessary to decide the position of the external stopper when precise rotation is required.
⑨ Do not use springs, etc., to add force in the rotational movement direction.
When rotational force from an external spring, etc., acts and generates negative pressure on the product’s interior, breakage of the internal seal or acceleration of abrasion may occur.
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Caution
① Do not use organic solvent to wipe the area of the name plate that shows the model.
It will erase what is indicated on the name plate.
② Do not hit the rotating shaft by securing the body or hit the body by securing the rotating shaft.
These actions could cause the shaft to bend or damage the bearing. When a load must be coupled to the rotating shaft, secure the rotating shaft.
③ Do not place your foot directly on the shaft or on the equipment that is coupled to the shaft.
Placing one’s weight directly onto the rotating shaft could cause the rotating shaft or the bearing to become damaged.
④ If a product is equipped with an angle adjustment function, use it within the specified adjustment range.
If the product is used outside the specified adjustment range, it could lead to equipment malfunction or product damage.
Air Supply
Warning
① Use clean air.
Do not use compressed air that contains chemicals, synthetic oils including organic solvents, salt or corrosive gases, etc., as it can cause damage or malfunction.
Caution
① When extremely dry air is used as the fluid, degradation of the lubrication properties inside the equipment may occur, resulting in reduced reliability(or reduced service life) of the equipment. Please consult with SMC.
② Install an air filter.
Install an air filter upstream near the valve. Select an air filter with a filtration size of 5 μ m or smaller.
③ Take measures to ensure air quality, such as by installing an aftercooler, air dryer, or water separator.
Compressed air that contains a large amount of drainage can cause malfunction of pneumatic equipment such as rotary actuators. Therefore, take appropriate measures to ensure air quality, such as by providing an aftercooler, air dryer, or water separator.
④ Ensure that the fluid and ambient temperature are within the specified range.
If the fluid temperature is 5 ℃ or less, the moisture in the circuit could freeze, causing damage to the seals and equipment malfunction. Therefore, take appropriate measures to prevent freezing.
For compressed air quality, refer to Best Pneumatics No. 5.
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Operating Environment
Warning
① Do not use in an atmosphere having corrosive gases, or where there is direct contact with this.
② Do not use in dusty locations or where water or oil, etc., splash on the equipment.
③ Do not use in a place subject to heavy vibration and/or shock.
Speed Adjustment
Warning
① To make a speed adjustment, gradually adjust starting from the low speed end.
If the speed adjustment is performed from the high speed end, it could damage the product.
As a result, it could pose a hazard to humans and damage the machinery and equipment.
Lubrication
Warning
① This product should be used without lubrication. Although it will operate even if it is lubricated, it could lead to sticking or slipping.
Maintenance
Warning
① During a maintenance inspection, do not disassemble the equipment with electrical power or an air supply applied.
② After the product has been disassembled for inspection, make sure to perform the appropriate functionality inspection.
The product specifications cannot be met unless a functionality inspection is performed.
Caution
① For lubrication, use the designated grease for each specific product.
The use of a non-designated lubricant could damage the seals.
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Attention of auto switch
Design / Selection
Warning
① ① Confirm the specifications.
Read the specifications carefully and use this product appropriately. The product may be damaged or malfunction if it is used outside the specification range for current load, voltage, temperature or impact.
Caution
① ① Take precautions when multiple actuators are used close together.
When multiple auto switch actuators are used close proximity, magnetic field interference may cause the auto switches to malfunction. Maintain a minimum actuator separation of 40mm.
The auto switches may malfunction due to the interference from the magnetic fields.
② Pay attention to the length of time that a switch is ON at an intermediate stroke position.
When an auto switch is placed at an intermediate position of the stroke and a load is driven at the time the piston passes, the auto switch will operate, but if the speed is too great the operating time will be shortened and the load may not operate properly.
The maximum detectable piston speed is:
Auto switch operating range (mm)
V(mm/s)= ×1000
Time load applied(ms)
③ ③ Keep wiring as short as possible.
<Reed switch>
As the length of the wiring to a load gets longer, the rush current at switching ON becomes greater, and this may shorten the product’s life. (The switch will stay ON all the time.)
1) Use a contact protection box when the wire length is 5 m or longer.
2) Even if an auto switch has a built-in contact protection circuit, when the wiring is more than
30 m long, it is not able to adequately absorb the rush current and its life may be reduced.
It is again necessary to connect a contact protection box in order to extend its life. Please consult with SMC in this case.
<Solid state switch>
3) Although wire length should not affect switch function, use a wire 100 m or shorter.
④ Pay attention to the internal voltage drop of the auto switch.
<Reed switch>
1) Auto switch with an indicator light (Except D-A56)
● If auto switches are connected in series as shown below, take note that there will be a large voltage drop because of internal resistance in the light emitting diodes. (Refer to the internal voltage drop in the auto switch specifications.)
[The voltage drop will be “n” times larger when “n” auto switches are connected.]
Even though an auto switch operates normally, the load may not operate.
Load
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● In the same way, when operating under a specified voltage, although an auto switch may operate normally, the load may not operate. Therefore, the formula below should be satisfied after confirming the minimum operating voltage of the load.
Supply Internal voltage Minimum operating
> voltage drop of auto switch voltage of load
2) If the internal resistance of a light emitting diode causes a problem, select an auto switch without an indicator for right (MODEL D-A6 □ )
<Solid state switch / 2-wire type>
3) Generally, the internal voltage drop will be greater with a 2 wire solid state auto switch than with a reed auto switch. Take the same precautions as in 1).
Also, take note that a 12VDC relay is not applicable.
⑤ Pay attention to leakage current.
<Solid state switch / 2-wire type >
Current (leakage current) flows to the load to operate the internal circuit even when in the OFF state.
Operating current of load (OFF condition) > Leakage current
If the criteria given in the above formula are not met, it will not reset correctly (stays ON).Use a
3-wire switch if this specification will not be satisfied.
Moreover, leakage current flow to the load will be “n” times larger when “n” auto switches are connected in parallel.
⑥ Do not use a load that generates surge voltage.
If driving a load such as a relay that generates a surge voltage,
<Reed switch>
Use an auto switch with built-in contact protection circuit or use a contact protection box.
<Solid state switch>
Use a built-in surge absorbing element type device.
⑦ Cautions for use in an interlock circuit.
When an auto switch is used for an interlock signal requiring high reliability, devise a double interlock system to avoid trouble by providing a mechanical protection function, or by also using another switch (sensor) together with the auto switch.
Also perform periodic maintenance and confirm proper operation.
⑧ Ensure sufficient clearance for maintenance activities.
When designing an application, be certain to allow sufficient clearance for maintenance.
⑨ When multiple auto switches are required.
“n” indicates the number of auto switches which can be physically mounted on the rotary actuators. Detection intervals depends on the auto switch mounting structure and set position, therefore some required interval and set positions may not be available.
⑩ Use the cylinder and auto switch in proper combination.
The auto switch is pre-adjusted to activate properly for an auto-switch-capable SMC cylinder/actuator.
If the auto switch is mounted improperly, used for another brand of cylinders/actuators or used after the alternation of the machine installation, the auto switch may not activate properly.
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Mounting / Adjustment
Caution
① Do not drop or bump.
Do not drop, bump or apply excessive impacts (300m/s
2
or more for reed auto switches and
1000m/s
2
or more for solid state auto switches) while handling.
Although the body of the auto switch may not be damaged, the inside of the auto switch could be damaged and cause malfunction.
② Do not carry a cylinder by the auto switch lead wires.
Never carry a cylinder by its lead wires. This may not only cause broken lead wires, but it may cause internal elements of the switch to be damaged by the stress.
③ Observe the proper tightening torque for mounting an auto switch.
When an auto switch is tightened beyond the range of tightening torque, auto switch mounting screws, auto switch mounting brackets or auto switch may be damaged.
On the other hand, tightening below the range of tightening torque may allow the auto switch to slip out of position.
④ Mount a switch at the center of the operating range.
Adjust the mounting position of an auto switch so that the piston stops at the center of the operating range (the range in which a switch is ON). (The mounting position shown in a catalog indicates the optimum, position at stroke end.) If mounted at the end of the operating range
(around the borderline of ON and OFF), operation will be unstable.
Wiring
Caution
① Avoid repeatedly bending or stretching lead wires.
Broken lead wires will result from repeatedly applying bending stress or stretching forces to the lead wires.
② Be certain to connect the load before power is applied.
<2 wire type>
If the power is turned ON when an auto switch is not connected to a load, the auto switch will be instantly damaged because of excess current (short circuit).
③ Confirm proper insulation of wiring.
Be certain that there is no faulty wiring insulation (contact with other circuits, ground fault, improper insulation between terminals, etc…) Damage may occur due to excess current flow into a switch.
④ Do not wire with power lines or high voltage lines.
Wire separately from power lines or high voltage lines, avoiding parallel wiring or wiring in the same conduit with these lines. Control circuits, containing auto switches, may malfunction due to noise from these other lines.
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⑤ Do not allow short-circuit of loads.
<Reed switch>
If the power is turned ON with a load in a short circuited condition, the auto switch will be instantly damaged because of excess current flow into the switch.
<Solid state switch>
Model D-J51 and all models of PNP output type auto switches do not have built-in short circuit protection circuits. If a load is short circuited, the auto switch will be instantly damaged as in the case of reed auto switches.
Take special care to avoid reverse wiring with the brown power supply line and the black output line on 3-wire type auto switches.
⑥ Avoid incorrect wiring.
<Reed switch>
A 24 VDC auto switch with indicator light has polarity. The brown lead wire or terminal No.1 is
(+), and the blue lead wire or terminal No.2 is ( - ).
1) If connections are reversed, an auto switch will operate, however, the light emitting diode will not light up.
Also, take note that a current greater than that specified will damage a light emitting diode and it will no longer operate.
Applicable model : D-A53, A54
<Solid state switch>
1) If connections are reversed on a 2 wire type auto switch, the auto switch will not be damaged if protected by a protection circuit, but the auto switch will always stay in an ON state.
However, it is still necessary to avoid reversed connections, since the auto switch could be damaged by a load short circuit in this condition.
2) If connections are reversed (power supply line + and power supply line - ) on a 3-wire type auto switch, the auto switch will be protected by a protection circuit. However, if the power supply line (+) is connected to the blue wire and the power supply line ( - ) is connected to the black wire, the auto switch will be damaged.
Operating Environment
Warning
① Never use in an atmosphere of explosive gases.
The structure of auto switches is not intended to prevent explosion. Never use in an atmosphere with an explosive gas since this may cause a serious explosion.
Caution
① Do not use in an area where a magnetic field is generated.
Auto switches will malfunction or magnets inside cylinders/actuators will become demagnetized.
(Please consult with SMC if a magnetic field resistant auto switch can be used.)
② Do not use in an environment where the auto switch will be continually exposed to water.
Although auto switches satisfy the IEC standard IP67 construction (JIS C 0920: waterproof construction) except some models do not use auto switches in applications where continually exposed to water splash or spray. Poor insulation or swelling of the potting resin inside auto switches may cause malfunction.
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③ Do not use in an environment with oil or chemicals.
Please consult with SMC if auto switches will be used in an environment with coolant, cleaning solvent, various oils or chemicals. If auto switches are used under these conditions for even a short time, they may be adversely affected by improper insulation, malfunction due to swelling of the potting resin, or hardening of the lead wires.
④ Do not use in an environment with temperature cycles.
Please consult with SMC if auto switches are used where there are temperature cycles other than normal temperature changes, as there may be adverse effects inside the auto switches.
⑤ Do not use in an environment where there is excessive impact shock.
<Reed switch>
When excessive impact (300 m/s
2
or more) is applied to a reed auto switch during operation, the contact point will malfunction and generate or cut off a signal momentarily (1 ms or less).
Please consult with SMC if a solid state auto switch can be used according to the environment.
⑥ Do not use in an area where surges are generated.
<Solid state switch>
When there are units (solenoid lifter, high frequency induction furnace, motor, radio equipment etc.) which generate a large amount of surge in the area around cylinders/actuators with solid state auto switches, this may cause deterioration or damage to the auto switch’s internal circuit elements. Avoid sources of surge generation and disorganized lines.
⑦ Avoid accumulation of iron waste or close contact with magnetic substances.
When a large amount of iron waste such as machining chips or spatter is accumulated, or a magnetic substance (something attracted by a magnet) is brought into close proximity with a cylinder with auto switches, or an actuator, it may cause the auto switch to malfunction due to a loss of the magnetic force inside the cylinder/actuator.
Maintenance and Inspection
Caution
① Perform the following maintenance periodically in order to prevent possible danger due to unexpected auto switch malfunction.
1) Secure and tighten auto switch mounting screws.
If screws become loose or the mounting, position is dislocated, retighten them after readjusting the mounting position.
2) Confirm that there is no damage to lead wires.
To prevent faulty insulation, replace auto switches or repair lead wires, etc., if damage is discovered.
3) Confirm the lighting of the green light on the 2 color indicator type auto switch.
Confirm that the green LED is on when stopped at the established position. If the red LED is on, the mounting position is not appropriate. Readjust the mounting position until the green
LED lights up.
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Attention of Solenoid Valves
Design / Selection
Warning
① Intermediate stops
For 3-position closed center valve type it is difficult to make a piston stop at the required position accurately due to the compressibility of air.
Furthermore, since valves and cylinders are not guaranteed for zero air leakage, it may not be possible to hold a stopped position for an extended period of time.
Caution
① Momentary energization
If a double solenoid valve is operated with momentary energization, it should be energized for at least 0.1 second. However, depending on the condition of the secondary load, it should be energized until the cylinder reaches the stroke end position, since there is a possibility of malfunction.
② Surge voltage suppressor
If a surge protection circuit contains nonstandard diodes, such as Zener diodes or ZNR, a residual voltage that is in proportion to the protective circuit and the rated voltage will remain.
Therefore, take into consideration the surge voltage protection of the controller.
In the case of diodes, the residual voltage is approximately 1V.
Mounting
Warning
① If air leakage increases or equipment does not operate properly, stop operation.
Check mounting conditions when air and power supplies are connected. Initial function and leakage tests should be performed after installation.
Piping / Wiring
Caution
① Connection of fittings
The connection of fittings to connected port Rc1/4 for the supply, tighten at 12 to 14N.m torque.
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② Polarity
When connecting power to a solenoid valve with a DC specification and equipped with a light or surge voltage suppressor, check for polarity.
If there is polarity, take note of the following.
No diode to protect polarity:
If a mistake is made regarding the polarity, damage may occur to the diode in the valve, the switching element in a control device or power supply equipment, etc.
With diode to protect polarity:
If polarity connection is wrong, the valve does not operate.
③ Applied voltage
When electric power is connected to a solenoid valve, be careful to apply the proper voltage.
Improper voltage may cause malfunction or coil damage.
Operating Environment
Warning
① Do not use in an atmosphere having corrosive gases, chemicals, sea water, water, water steam, or where there is direct contact with any of these.
② Do not use in a place in the explosive atmosphere.
③ Do not use in a place subject to heavy vibration and/or shock.
④ The valve should not be exposed to prolonged sunlight. Use a protective cover.
⑤ Remove any sources of excessive heat.
⑥ If it is used in an environment where there is possible contact with oil, weld spatter, etc., exercise preventive measures.
Maintenance and Inspection
Warning
① Removal of equipment, and supply/exhaust of compressed air
When components are removed, first confirm that measures are in place to prevent workpieces from dropping, run-away equipment, etc. Then, cut off the supply pressure and electric power, and exhaust all compressed air from the system using the residual pressure release function.
For 3-position closed center valve type, exhaust the residual pressure between the valve and the cylinder.
When the equipment is operated after remounting or replacement, first confirm that measures are in place to prevent lurching of actuators, etc. Then, confirm that the equipment is operating normally.
② Low frequency operation
Valves should be operated at least once every 30 days to prevent malfunction. (Use caution regarding the air supply.)
③ Manual override
When the manual override is operated, connected equipment will be actuated.
Operate after safety is confirmed.
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Outline
This operation manual is for rack pinion type Rotary actuator with Solenoid Valve. Cautions will be given on the load (inertia moment), rotation time and others. Please read through the manual before starting operation.
Specification
Table1 Specification
Size 50 63 80 100
Fluid
Max. operating pressure
Air(Non-lube)
0.9 MPa
Min. operating pressure
Ambient and fluid temperature
0.15 MPa
0 ℃ to 50 ℃( No freezing )
Backlash
Allowable tolerance of Rotating angle
Cushion
Within1°
0 to +4°
None, with air cushion
Mounting style
Table2 Solenoid Valve Specification
Basic style, Foot style
5 Port Pilot Operated Solenoid Valve(Rubber Seal) VF3000
Electrical entry
Grommet, Grommet terminal, Conduit terminal,
DIN terminal, L plug connector, M plug connector
100, 200V ( 50/60Hz ) AC
Coil rated voltage
DC polar indication
Allowable voltage change
Coil insulation
24V
-15 to +10% of the rated voltage
Equivalent to B class(130 ℃ )
Inrush 5.6VA(50Hz) 、 5.0VA(60Hz)
Apparent power AC
Holding 3.4VA(50Hz) 、 2.3VA(60Hz)
Power consumption
DC polar indication
1.8W
-16-
Table3 Allowable Kinetic Energy and Rotation Time Adjustment Range
Allowable kinetic energy(J)
Size
50
Without
Air cushion
0.05
With Air cushion ※
0.98
Adjustable range of rotation time safe in operation
( s/90 ゚)
0.2 to 2
63
80
0.12
0.16
1.50
2.00
Cushion angle
35°
0.2 to 3
0.2 to 4
100 0.54 2.90 0.2 to 5
※ Allowable kinetic energy of the bumpers equipped model is the maximum absorbed energy under proper adjustment of the cushion needle.
Table4 Mass (Kg)
Standard mass ※ Additional mass
Size
90° 180° With auto switches Foot bracket
50
63
80
1.7
2.7
4.5
1.9
3.2
5.2
0.2
0.4
0.6
0.3
0.5
0.9
100 8.7 9.7 0.9 1.2
※ Mass of the solenoid valves is not included. Please add weight of the Table5.
Table5 Mass of the solenoid valves (Kg)
Size No. of positions/solenoids
50
~
100
2 position single 2 position double
3 position closed center
3 position exhaust center
0.2 0.3 0.4 0.4
Table6 Rotary Actuator Inner Volume (cm
3
)
Rotation angle
Size
90° 100° 180° 190°
50 32 36 65 68
63
80
100
60
111
259
67
123
288
120
221
518
127
233
547
-17-
Effective torque
Table7 Effective torque table (N ・ m)
Operating pressure (MPa)
Size
0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
50 2.78 3.71 5.57 7.43 9.27 11.2 13.0 14.9 16.7
63
80
100
5.16 6.88 10.4 13.8 17.2
9.52 12.7 19.0 25.3 31.7
22.3 29.7 44.6 59.4 74.3
20.6 24.0 27.5 31.0
38.0 44.4 50.7 57.0
89.1 104 119 133
Rotation Range of Keyway and How to adjust the Rotation Speed
Rotation direction
When current is applied to SOL1, the shaft rotates clockwise.
How to adjust the rotation speed:
Turn the needle valve of the throttle valve clockwise to reduce the exhaust flow volume, thus slowing the rotation speed.
Throttle valve A regulates the clockwise rotation speed of the shaft and throttle valve B regulates the counterclockwise speed to the shaft.
Fig. (1) Rotation direction and
How to adjust the rotation speed
Fig. (2) Rotation Range of shaft Keyway
-18-
How to Adjust the Air cushion
How to adjustment
When with air cushion type used, an adjustment must be made in accordance with the operating speed and the moment of inertia of the load.
Rotating the cushion needle reduces the orifice diameter and increases cushion effect.
Counterclockwise increase orifice diameter and reduces cushion effect.
Open the cushion needle gradually from closed condition.
Caution a) Tighten the cushion needle lock nut properly when adjusted the cushion needle.
Long period of operation, and cushion effect becomes weaker. Re-adjustment is necessary. b) Don’t operate the actuator with the cushion needle orifice completely closed. The piston may bumps into the stroke end, not fully travel the stroke, or the pressure exceeds the proof pressure of the cushion packing.
c) The cushion needle itself is provided with a pull stop. Do not apply an excessive force to loosen the cushion needle.
Cover
Lock nut
Cushion needle
Fig(3) How to Adjust the Air cushion
-19-
Internal structure and parts description
Rotary Actuator with Solenoid Valve Internal structure
Solenoid valve
Auto switch
-20-
Mounting
Restriction of the load
Provided that a dynamic load is not generated, a load in the axial direction can be applied up to the value that is indicated in the table8 below. However, applications in which the load is applied directly to the shaft should be avoided as much as possible.
Table8 Allowable shaft load (N)
Load direction
Size
Fsa Fsb ※ Fr
Fsa
Fr
50 490 196 196
63 588 196 294
80 882 196 392
100 980 196 588
Fsb
※ Point of application of force of Fr is the center of shaft flat face and longer dimension of the key. Fig(4) Load direction
The methods such as those described below are recommended to prevent the load from being applied directly to the shaft in order to ensure a proper operating condition.
Fig(5) Bearing
Operation of shaft couplings
As in Fig.6, alignment of the rotary actuator and the mating axis is necessary when the rotary actuator is used with its axis lengthened. If misaligned, the axis is applied with excessive bend moment. Under this condition, stable operation is not available which lead to cause the damage of axis. In this case, flexible fitting (flexible joint specified by JIS) becomes necessary.
Rotary actuator Flexible coupling
Fig(6) Flexible coupling
Bearing
Load
-21-
Piping and operating direction
Fig.(7) shows piping ports of the rotary actuator.
Table 9 shows the port size.
Table 9 Ports size
Size Ports size
50 ~ 100 Rc1/4
Piping port (Opposite side)
Fig.(7) Port location
Perform followings before piping. a) Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil and other debris from inside the pipe. b) 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, as in Fig.8, leave 1.5 to 2 thread ridges exposed at the end of the threads.
Operating air
Air supplied to the rotary actuator shall be cleaned by the filter. CVRA1 series is lubrication free.
-22-
Fig.8
Wrapping of pipe tape
Setting rotation time
Even if the torque that is generated by the rotary actuator is small, the parts could become damaged depending on the inertia of the load. Therefore, the rotation time should be determined by calculating the load’s inertial moment and kinetic energy.
Moment of inertia
Inertia moment indicates scales how hard to rotate the object, and also how hard to stop rotating object.
An object started by the rotary actuator is getting to have inertia force. When the rotary actuator stops at the stroke end, the actuator received big impact (kinetic energy) due to inertia force.
Please refer below for calculation of kinetic energy.
E
=
1
2
×
I
× ω 2
E : Kinetic energy J
I I II : Inertia moment kg/m
2
ω : Angular speed rad/s
Allowable kinetic energy for the rotary actuator is limited. The limit of rotation time is obtained by calculating inertia moment. Please refer following for obtaining inertia moment.
Basic inertia moment
I
= m
⋅ r
2 m : Weight of load (kg) r : Load center of gravity and distance of rotation axis. (m) r
Fig.9 Inertia moment m
This shows inertia moment of “m (weight)” at “r” from the rotation axis. Calculation of inertia moment depends on the shape of the object. Please refer the table on the next page for inertia moment calculation.
-23-
Equation table of moment of inertia
① Thin shaft
Position of rotational axis: Perpendicular to the shaft through the center of gravity.
I
:
Moment of inertia kg
・ m m
:
Load mass kg
⑥ Thin round plate
Position of rotational axis: Through the center of diameter
② Thin rectangular plate
Position of rotational axis: Parallel to side b and through the center of gravity
⑦ Cylinder
Position of rotational axis: Through the center of diameter and gravity
③ Thin rectangular plate(Including Rectangular
parallelepiped)
Position of rotational axis: Perpendicular to the plate through the center of gravity
⑧ When the rotational axis and load center of
gravity and not consistent
④ Round plate(Including column)
Position of rotational axis: Through the center axis
⑨ Gear transmission
⑤ Solid sphere
Position of rotational axis: Through the center of diameter
-24-
Kinetic energy
Table 10 shows the allowable kinetic energy of the rotary actuator.
The end angular speed ω is obtained by:
Table 10 Allowable kinetic energy
ω=
2 t
θ
θ: Rotation angle rad
(90°:1/2 π rad)
(180°: π rad) t: Rotation time s
Kinetic energy E is obtained by:
E
=
1
2
×
I
×
ω 2
Therefore, the rotary actuator rotation time is:
Size
50
63
80
Allowable kinetic energy J
Without
Air Cushion
0.05
0.12
0.16
With
Air Cushion ※
0.98
1.50
2.00
100 0.54 2.90
※ The allowable kinetic energy of the actuators with a cushion is the maximum absorbed energy when the cushion needle is properly adjusted.
t
≥
2
×
I
×
θ
E
E: Allowable kinetic energy J
θ : Rotation angle rad
I: Inertia moment
Please refer to Table 3 for the Swing time adjustable range of each size.
kg ・ m 2
For equiangular acceleration, the angular velocity, ω , after t seconds are obtained using the following equations.
・
ω= ω
× t
− − − − − − − − − − − − − − − − −
( 1 )
θ=
∫
・
ω tdt=
1 ・
ω
2
2
+C
− − − − − − −
( 2 ) C : Integration constant
Because the displacement angle in t=0 becomes θ =0, it becomes C=0.
θ=
1
2
・
ω
2
=
1
ωt
2
Hence
2θ
ω= t
-25-
External stopper
When the kinetic energy where the load is generated exceeds a permissible kinetic energy of the actuator, it is necessary to install the shock-absorbing mechanism outside and to absorb inertia force.
There is backlash of the gear because the CRA1 series is a single rack type. (It is within 1° at the rotation end.) When there is no backlash, and an accurate positional precision is necessary, an external stopper is needed.
Please use the product of 100° in swing angle and 1 90° respectively when 90° in swing angle and 180° are set up in an external stopper and used .
Fig.10 External stopper
-26-
Calculation of required torque
Load type
The calculation method of required torque varies depending on the load type.
-27-
Auto switch type for rotary actuator
The rotary actuator with auto switch has a piston with magnet mounted and an auto switch mounted no the body externally to detect the piston (magnet) position.
Auto switch specification
Table 11 Reed auto switch specification
Auto switch part no.
Load voltage
Applicable load
Indication light
(illuminated when ON)
Wiring (Output)
Electrical entry
D-A56 DC5V IC circuit 3-wire (NPN)
D-A53
DC12V
DC24V
AC100V
AC200V D-A54
DC24V
AC200V
D-A64 DC12V
DC24V
DC12V
D-A67
DC24V
D-A59W DC24V
Relay
PLC
Relay
PLC
IC circuit
PLC
Relay
PLC
Yes
No
Yes
2-wire
Grommet
● Isolation resistance ii - 50M Ω or more at DC500VM (between lead wire and case)
● Withstand voltage ii - AC1500V for 1 minute (between lead wire and case)
● Operating time i - 1.2ms
● Ambient temperature - -10 ~ 60 ℃
● Shock resistant - 300 m/s
2
● Current leakage i - None
● Enclosure ii - Standard: IEC60529, watertight: IP67(JISC0920)
-28-
Table12 Solid state auto switch specification
Auto switch part no.
Load voltage
Applicable load
Indication light
(illuminated when ON)
DC5V,12V
D-F59
DC24V
DC5V,12V
IC circuit
Relay
PLC
D-F5P
DC24V
Wiring (Output)
3-wire (NPN)
3-wire(PNP)
Electrical entry
D-J59
D-J51
DC12V
DC24V
AC100V
AC200V
D-F59W
DC5V,12V
DC24V
D-F5PW
DC5V,12V
DC24V
Relay
PLC
IC circuit
Relay
PLC
Yes
2-wire
3-wire (NPN)
3-wire(PNP)
Grommet
D-J59W
D-F5BA
DC12V
DC24V
DC12V
DC24V
Relay
PLC
2-wire
D-F59F
DC5V,12V IC circuit
Relay
PLC
4-wire (NPN)
DC24V
● Isolation resistance i - 50M Ω or more at DC500VM (between lead wire and case)
● Withstand voltage ii - AC1000V for 1 minute (between lead wire and case)
● Operating time i - 1ms or less
● Ambient temperature - -10 ~ 60 ℃
● Shock resistant - 1000 m/s
2
● Enclosure ii - Standard: IEC60529, watertight: IP67(JISC0920)
-29-
Proper auto switch mounting position and operating range
Fig. 11
Size
50
63
80
100
Rotation
A 〔 mm 〕
Reed auto switch (D-A53)
Operation angle
θ m(Lm)
Hysteresis angle
90 ° 9
180 ° 26
65 ° 20 °
90 ° 11
180 ° 30
60 ° 10 °
90 ° 15
180 ° 37
90 ° 27
180° 60
Auto switch
Proper auto switch mounting position
Table 13 Operating range of auto switch
45 °
35 °
Most sensitive position
Operating range at proper mounting position (Lm/2)
Operating range of
Single auto switch (Lm)
Fig. 12 Operating range of auto switch
7 °
5 °
Operating angle θ m : Converts the operating range (Lm) of the auto switch into the rotation angle.
Angle of hysteresis: The hysteresis of the auto switch is converted to degrees.
If the auto switch is set in dimension “A”, the magnet is placed around the most sensitive area of the switch when the piston reaching the stroke ends.
Please consult with SMC concerning the angles for the auto switches other than the reed auto switch (model D-A53).
-30-
Auto switch operation principle
In the diagram below, auto switch B is ON. When pressure is applied from A, the piston moves to B, causing the shaft to rotate clockwise. At this time, magnet B goes out of the movement range of auto switch B, causing auto switch B to turn OFF. Furthermore, the piston moves to the right, causing magnet A to enter the movement range of auto switch A. As a result, auto switch A turns ON.
Magnet A
Auto switch A
Magnet B
Auto switch B
Fig. 13 Auto switch operation principle
-31-
Maintenance and Inspection
Periodic inspection is necessary for optimum use. Generally, annual inspection is recommended for the rotary actuator. Even if no problem is found, seal parts replacement is recommended every three years. It is highly possible that the actuator is operated out of specification when the components like shaft, pinion, rack, bearing are broken. Please revise the operating condition. In this case, please return the broken actuator to SMC to repair.
Periodic inspection
Check followings for periodic inspection
(1) If the rotary actuator set screw become loose
(2) Operating state
(3) Leakage to outside
(4) Is not the backlash of the rack-and-pinion abnormally large?
If any items are found by the inspection that require repairing, tighten any loose parts or disassemble the product to repair.
Replacement parts
(1) Disassemble where clean and spacious place.
(2) Cover the rotary actuator pipe inlet and the end of rubber hose after removing the rotary
actuator.
(3) Mind not to damage internal sliding surface of the rotary actuator when disassembling it.
(4) Please consult with us when you have any question on disassembling and inspection.
Table 14 Replacement parts
Description
Model Product No.
Parts name Amount
C □ VRA1 □ □ 50
C □ VRA1 □ □ 63
C □ VRA1 □ □ 80
C □ VRA1 □ □ 100
P294020-49A
⑦ Slider 2 pcs
⑪ Tube gasket 2 pcs
P294030-49A
P294040-49
⑫ Piston seal
⑮ Spring pin
23
O-ring ⑩
2 pcs
4 pcs
2 pcs
24 O-ring ⑩ 4 pcs
P294050-49A
25 O-ring ⑩ 2 pcs
(Grease pack)
(10g)
Refer to page 20 for detailed Product structure.
-32-
■ Disassembly Procedure
(1) Loosen the hexagon socket head cap screws to remove O-ring 25 with the Solenoid valve
17.
(2) Loosen the hexagon socket head cap screws to remove the sub-plate 18 19 and the pipe 20.
(At this stage, O-rings 23 and 24 are attached to the groove.)
18 23 24
17 25
20 19
20 18
(3) Loosen the cross recessed round head screw to pull out the bearing retainer 9 with the shaft 5 . Pull out the bearing 13 from the body housing at this time.
(4) Loosen the hexagon socket head cap screws to remove the cover 2 and 3 . (Remove the cover from the right and left sides.)
(5) Remove the piston 4 with the rack 16 from the body 1 .
(The rack has a specified mounting direction, so this should be checked when removing it from the body.)
3
1
9
5
13
13
4 16 4
2
-33-
■ Assembly Procedure
(1) Clean each part sufficiently before assembly to make sure no dust is stuck to it. Apply the grease provided in the seal kit to parts shown in Table 15. As a guideline, apply enough grease to make the surface shiny.
Do not scratch the seal when mounting it to the piston.
Be careful with the direction of the piston seal. (See Fig. 14.)
Table 15 Parts where grease is to be applied
Application of grease Grease
① Body (inner sliding surface)
④ Piston(Seal groove)
⑦ Slider(Sliding surface)
⑫ Piston seal
GR-S-010
⑪ Tube gasket
23 24 25 O-ring
25
23 24
25 24
23
5
11
4
1
12 16
4
7
12 11
-34-
(2) Mount the tube gasket 11 to the left cover 3 to mount to the body 1 .
(3) Insert the rack 16 and the piston 4 into the body 1 . Push the piston until it touches the left cover 3 . At this time, the piston assembly should be inserted carefully in the direction shown in Fig.14 so as not to damage the piston seal through which the housing for the bearing of the body will pass.
(4) Set the lower bearing 13 to the housing in the body to assemble the shaft 5 . Refer to
Fig.14 for the direction of the key groove (facing to the right cover).
(5) Mount the upper bearing 13 and the bearing retainer 9 to the body. Tighten with the cross recessed round head screw.
(6) Mount the tube gasket 11 to the left cover 2 to mount to the body 1 . Tighten them with hexagon socket head cap screws.
9
13
Piston seal
3
5
11 13
1
4
16 4
11
Direction of the shaft (key)
Piston seal
Fig. 14 Piston seal and Direction of assembly of the shaft
-35-
2
(7) Mount the pipe 20 to the sub-plate 18 and 19 and fix with hexagon socket head cap screws.
(At this stage, O-rings 23 and 24 are attached to the groove.)
(8) Mount the O-ring 25 to the solenoid valve 17 and fix with hexagon socket head cap screws to the sub-plate 19 .
18 23 24
17 25
20 19
24
23
(9) After assembly is completed, perform an operation test and check that there is no air leakage.
-36-
Troubleshooting
Problem
Rotary actuator
doesn’t move
Possible cause
Supply pressure isn’t applied correctly. pressure side.
Solution
Correctly set the regulator at the supply
The directional switching valve (such as a solenoid valve) doesn’t switch.
Correctly apply a signal to the directional switching valve (such as a solenoid valve).
Air leakage from piping.
Inspect the piping and stop the leakage.
Refer ence page
16
16
22
22
The restrictor in the port is clogged.
Clean the restrictor.
Take the following countermeasures:
(1) Blow air through the piping again.
(2) Inspect the air filter.
Operation is not smooth.
(stick-slip)
Extreme rotating angle changes.
21
A load has some friction. Reduce the friction resistance.
Actuator axis and mating axis not aligned.
Align the two centers or use a flexible fitting.
21
27
Insufficient output due to a low supply pressure.
To obtain stable operation, adjust the supply pressure so that the load rate becomes 50% or less.
18
Throttle valve is restricted too much.
Adjust the throttle valve so that the rotating marks will be in the adjusting range.
Internal parts are broken.
Replace with a new actuator.
Please do the following treatment on that.
(1) Calculate the kinetic energy applied to the rotary actuator, and adjust the load and rotating speed so that the kinetic energy will be within the allowable range.
-37-
23
Problem Possible cause Solution
Extreme rotating angle changes.
Air leakage from the shaft.
The pinion gear is broken.
Internal parts are broken.
Piston packing is worn out.
Excessive kinetic energy was applied to the rotary actuator.
(2) Please install the stopper or the shock absorber outside and absorb the impact power.
In this case, please provide a buffer angle to the stroke of the actuator ( Use 100° actuator in the case of 90° stroke and use 190° actuator in the case of 180° stroke.
) and touch it to an external stopper or the shock absorber surely.
Please confirm the presence of the wound in the cylinder inner wall after cleaning the inside of the cylinder.
Please do the following treatment on that.
(1)Please exchange packing when
there is no wound in the cylinder.
(2)Please exchange it for a new
actuator when there is a wound in the
cylinder.
(3)Please when very dirty in the
cylinder inspect the air filter, do blow
air through the piping
Replace with a new actuator.
Please do the following treatment on that.
(1) Calculate the kinetic energy applied
to the rotary actuator, and adjust the
load and rotating speed so that the
kinetic energy will be within the
allowable range.
(2) Please install the stopper or the
shock absorber outside and absorb
the impact power.
In this case, please
provide a buffer angle to the stroke of
the actuator ( Use 100° actuator in the case of 90° stroke and use 190° actuator in the case of 180° stroke.
) and touch it to an external stopper or the shock absorber surely.
-38-
Refer ence page
26
22
32
23
Problem
The pinion gear is broken.
Insufficient rotating
Angle.
Possible cause Solution
(With the air cushion)
It doesn't become the best the adjustment of the cushion needle, and the kinetic energy is unabsorbed in the cushion.
There is no margin on swing angle of actuator, hence swing range of actuator is unsymmetrical with respect to external stopper.
Replace with a new actuator.
Please do the following treatment on that.
(1) Please adjust the cushion needle
best.
(2) Please the kinetic energy where the
load is generated is cushion
absorption energy or less or check.
External stopper remove, and please confirm the range of all swings of the actuator, and install external stopper in correct position.
In this case, please provide a buffer angle to the stroke of the actuator
( Use 100° actuator in the case of
90° stroke and use 190° actuator in the case of 180° stroke.
) and touch it to an external stopper or the shock absorber surely.
Refer ence page
19
23
26
19
(With the air cushion)
The cushion needle is in the state of totally enclosed.
Please adjust the cushion needle.
30
The auto switch is mounted in an inappropriate position.
Mount the auto switch in the correct position.
12
The auto switch will not operate or operates incorrectly.
Influence from an external magnetic field
Trouble with the electrical circuit
Check that there is no strong magnetic field present.
Check that there is no trouble with the electrical circuit.
9
28
Trouble with the electrical specification
Check there is no trouble with the electrical specification.
-39-
Problem
Solenoid valve doesn't operate.
Possible cause Solution
Refer ence page
14
Faulty wiring Try to connect wires correctly.
Decreased pilot pressure
Please adjust the setting of the supply pressure side decompression valve correctly.
Decreased power-supply voltage
Please confirm the problem is not in the specifications such as the voltages and the currents.
16
16
-40-
Revision history
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: +81 3 5298 5362
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

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