c x z 1) Confirm that there is no air pressure inside the cylinder, and remove dust cover . 2) Supply air pressure of 0.2 MPa or more to unlocking port shown in the drawing on the left. 3) Use a hexagon wrench (o25, o32: Width across flats 2.5, o40, o50: Width across flats 3) to remove unlocking bolt . Warning 1. When starting operation from the locked position, be sure to restore air pressure to the B line in the pneumatic circuit. When pressure is not applied to the B line, the load may drop or the cylinder may eject at high speed, which is extremely dangerous. It may also damage the cylinder, greatly shorten the service life or cause unlocking malfunction. When applying pressure to the B line, be sure to confirm whether the environment is safe since a workpiece may move. 2. Shipped in the unlocked condition maintained by the unlocking bolt. Be sure to remove the unlocking bolt following the procedures below before operation. The locking mechanism will not be effective without the removal of the unlocking bolt. Preparing for Operation Mounting Caution 1. Be sure to connect the load to the rod end with the cylinder in an unlocked condition. If this is done when in a locked condition, it may cause damage to the lock mechanism. 2. When fixing a work piece at the end of the piston rod, first retract the piston rod to the back end. Use the spanner hook at the end of the rod to keep the torque below the allowable tightening torque. 3. Always apply the piston rod load in the axial direction. Avoid operation where rotational torque is applied. If it is the only possible way, be sure to use it within the allowable range shown in the table below. 4. The piston speed may exceed the maximum operating speed of 500 mm/s if the piping is directly connected to the cylinder. Please use speed controllers by SMC to adjust the piston speed so that it will not exceed 500 mm/s. Allowable Rotational Torque Size Allowable rotational torque Allowable torque for workpiece mounting (N・m) 25 0.25 1.7 32 0.25 1.9 40 0.55 2.0 50 1.25 4.9 Pneumatic Circuit Warning . Emergency stop circuit 1. Perform emergency stops with the pneumatic circuit. (Circuit examples 3 and 4) This cylinder is designed for locking against inadvertent movement from a stationary condition. Do not perform intermediate stops while the cylinder is operating, as this may cause unlocking malfunction or shorten the service life. Emergency stops must be performed with the pneumatic circuit, and workpieces must be held with the locking mechanism after the cylinder fully stops. 2. When restarting the cylinder from the locked state, remove the workpiece and exhaust the residual pressure in the cylinder. (Circuit examples 3 and 4) A cylinder may eject at high speed, which is extremely dangerous. It may also damage the cylinder, greatly shorten the service life or cause the locking malfunction. 3. Be sure to release the lock before operating the cylinder. (Circuit example 4) When the lock release delays, the cylinder may eject at high speed, which is extremely dangerous. It may also damage the cylinder, greatly shorten the service life or cause the locking malfunction. Even when the cylinder moves freely, be sure to release the lock and operate the cylinder. . Drop prevention circuit, Emergency stop circuit 1. If installing a solenoid valve for a lock unit, be aware that repeated supply and exhaustion of air may cause condensation. (Circuit examples 2 and 4) The lock unit operating stroke is very small and so the pipe is long. If supplying and exhausting air repeatedly, condensation, which occurs by adiabatic expansion, accumulates in the lock unit. This may then cause air leakage and an unlocking malfunction due to corrosion of internal parts. Series MLU Specific Product Precautions 2 Be sure to read before handling. Refer to front matter 39 for Safety Instructions and pages 3 to 12 for Actuator and Auto Switch Precautions. Extension locking F Retraction locking B 1 2 3 4 B A B A B A B A B A B A Circuit example Emergency stop Drop prevention . The symbol for the cylinder with lock in the basic circuit uses SMC original symbol. 981 CLJ2 CLM2 CLG1 CL1 MLGC CNG MNB CNA2 CNS CLS CLQ RLQ MLU MLGP ML1C D-�ｮ -X�ｮ