Festo Кабели и принадлежности User Manual
Page 101
3. Installation
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Festo P.BE−SPC200−EN en 0901d
Dimensional reference system for drive type DNCI−...
Reference points
(1)
Reference point ć point of reference for the axis zero point. The reference point can be an
external, adjustable fixed stop or the lower or upper end stop of the drive itself.
(2)
Axis zero point ć position of the piston rod when completely retracted, without external fixed
stop. All other axis−specific reference values refer to this point.
(3)
Project zero point ć reference point for all position values in programs and the position regisĆ
ters; defined by the user. An actual position which is displayed also refers to this point. With
this reference value, the user has the option of using software to compare the location of the
position values to a fixed point on the machine.
Definition of paths
(A)
Reference position offset ć specifies the offset between the axis zero point and the reference
point. This is always a positive value. This offset value also affects the servo optimization of
the SPC200; even small values (a few mm) must be specified as precisely as possible.
(B)
Project zero point offset ć specifies the offset between the axis zero point and the project zero
point. It is a signed value; the arrow direction depicted corresponds to a positive numeric
value.
(C)
Value of the current position (
j actual position) relative to the project zero point.
(D)
Value of the lower software end position; defines the smallest position value that can be
moved to.
(E)
Value of the upper software end position; defines the largest pos. value that can be moved to.
(F)
Working stroke ć specifies the working positioning range of the axis; it is determined by the
software end positions and specified by the user. The following applies: (F) = (E) ć (D)
(G)
Maximum permissible positioning range; determined by the drive length and the stroke
reserve. The following applies: (G) = (H) ć 2 * [K]
(H)
Stroke of the DNCI; also corresponds here to the measuring system length, and is indicated on
the type plate.
[K]
Stroke reserve ć positioning must not take place in the range in front of the end covers.
Positioning behaviour becomes unreliable in this range because it is affected by the damping
elements in the covers. These values can be found in the appendices for the relevant drives.
When selecting the drive, the following relationship between the lengths must be observed:
(G)
ţ (F)