SMC Networks MWB 100 Series, Operation Manual

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[Use with air cylinder]
③
Use the pneumatic circuit which applies balance pressure to the both sides of the piston when
locking.
To prevent sudden extension when operation restarts or lock is released, control the cylinder to make
balancing pressure applied to both sides of the piston so that the force generated in the operating direction of
the piston due to load can be counteracted.
④
Effective area of the lock release solenoid valve shall be more than 50% of that of the cylinder
actuating solenoid valve. The lock release solenoid valve should be installed closer to the cylinder
than the solenoid valve actuating the cylinder.
If the effective area of the lock release solenoid valve is small, or the solenoid valve is far from the cylinder, it
takes longer to exhaust lock release air and may cause locking delay. Due to the delay, the increase of overrun
for intermediate stop or emergency stop in the middle of operation can result. In applications of holding as drop
prevention, due to the locking delay, the work piece may fall temporarily depending on the timing of the load.
⑤
Back flow of the exhaust pressure from the common exhaust type valve manifold is not allowed.
If exhaust pressure for lock release flows backwards, locking may not be performed correctly. Use an
individual exhaust type manifold or single unit valve.
⑥
Time between locking and lock release shall be 0.5 seconds or longer.
If locking time is short, the piston rod and the workload will shoot out faster than the speed controlled by speed
controller.
⑦
Control the switching operation of the lock release solenoid valve during restart of the cylinder so
that the lock release solenoid valve is switched before the cylinder actuating solenoid valve or both
switched at the same time.
If locking time is short, the piston rod and the workload will shoot out faster than the speed controlled by the
speed controller.
⑧
Basic Circuit
SOL.A SOL.B SOL.C Operation
ON ON OFF Forward
OFF OFF OFF Lock
ON OFF OFF Unlock
ON ON OFF Forward
ON OFF ON Retract
OFF OFF OFF Lock
ON OFF OFF Unlock
ON OFF ON Retract
0.5S or
longer
0~0.5S
0.5S or
longer
0~0.5S
1. [Horizontal]
2. [Vertical]
[Load applied in extending direction of the rod]
［
Load applied in retracting direction of the rod
］