SMC Networks DAS Operation Manual page 5

2.Specific Product Precautions
Parts and Names of Products
For Double-end
One-touch Fitting
（Valve Piping）
For Single-end
（L Type Shown）
Timing Knob
(Light Blue)
nd
2 Speed Knob
（Gray）
Mounting Bracket
One-touch Fitting
（Cylinder Piping）
Adapter
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Doc.no.DOC1018150
Design/ Selection
Warning
(1)Confirm the specifications.
This product is designed to be used only in a
compressed air system (including vacuum).
Do not operate at pressures, temperatures, etc.,
beyond the range of specifications, as this can
cause damage or malfunction. (Refer to the
product 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 specifications range.
(2) This product is designed to perform
deceleration of the cylinder stroke and cannot
be used for a complete accurate and precise
intermediary stop of the actuator.
(3) Sonic conductance and critical pressure
ratio values for products are representative
values. The value of the deceleration controller
after deceleration is the value as of when the 2
speed knob is fully opened.
Design/ Selection
Caution
(1) Check the range in which the deceleration
timing can be adjusted.
Check the range in which the deceleration timing
can be adjusted by using the following formula as
a guide.
It may be difficult to control the deceleration
timing with this product depending on the cylinder
stroke and initial velocity.
* When you make adjustment for the first time,
adjust the speed by setting the number of speed
controller rotations from fully closed position to
four to five rotations. The cylinder may extend
suddenly if the cylinder is not pressurised. Make
adjustment by paying attention to the surrounding
areas.
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1
0.4 <
���������������� �������������� ���������������� (
*1 Switching time 0.4 (sec.)
Minimum switching time 0.3 sec. / guideline switching
stroke 75% ≈ 0.4
Example) When a cylinder whose stroke is 50 mm is
operated at 100 mm/sec, the formula is: 50 / 100 = 0.5.
As the value is greater than 0.4, deceleration control is
possible.
When a cylinder whose stroke is 50 mm is operated at
200 mm/sec, the formula is: 50 / 200 = 0.25. As the value
is smaller than 0.4, deceleration control is not possible.
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