IAI America SCON-C - Manual (Page 110)

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2.2.10 Overview of Solenoid Valve Mode 2 [3-point Type]
This type provides a control method adjusted to that of an air cylinder by assuming that the controller is used as
an air cylinder.
The key differences between this controller and an air cylinder are summarized in the table below. Program
appropriate controls by referring to this table.
Take note that incremental position commands are not supported in solenoid valve mode 2 [3-point type].
Item Air cylinder SCON
Drive method Air pressure supplied via
electromagnetic valve
control Ball-screw or timing-belt drive using an AC servo motor, or linear-
motor drive
Target position
setting Mechanical stopper
(including shock
absorber) Desired coordinates are entered in the [Position] field of the position
table.
Coordinates can be entered from the PC/teaching pendant using the
keyboard/keys, or the actuator can be moved to the desired position
to read the achieved coordinates directly.
Example) 400-mm stroke
Position No. Position
0 5 (mm) Rear end
1 400 (mm) Front end
2 200 (mm) Intermediate point
Target position
detection An external detection
sensor, such as a reed
switch, is installed. Determined based on the internal coordinates provided by the
position information from the position detector (encoder).
Accordingly, external detection sensor is not required.
Speed setting Adjusted by a speed
controller.
A desired feed speed is entered in the [Speed] field of the position
table (unit: mm/sec).
Note that the rated speed is automatically set as the initial value.
Acceleration/
deceleration
setting Determined in
accordance with the load,
supplied air volume, as
well as the performance
of the speed controller
and electromagnetic
valve. Desired acceleration/deceleration are entered in the [Acceleration]
and [Deceleration] fields of the position table (minimum setting unit:
0.01 G).
Reference: 1 G = Gravitational acceleration
Note that the rated acceleration/deceleration is automatically set as
the initial value.
Since the acceleration/deceleration can be set in fine steps, a
gradual acceleration/deceleration curve can be programmed.
Setting a larger value makes the curve steeper, while setting a
smaller value makes the curb more gradual.
0.3G 0.1G
Acceleration Deceleration
Starting position
of movement Ending position