Festo Кабели и принадлежности - Manual (Page 97)

3. Installation
3−19
Festo P.BE−SPC200−EN en 0901d
Dimensional reference system for drive type DGP(I)(L)−...
Reference points
(1) Measuring system zero point ć this is always on the connection side of the measuring system,
and is reached when the connecting rod of the measuring system is retracted; corresponds to a
measured value of 0".
(2) Axis zero point, position of the slide/piston at the stop which is located closest to the measurĆ
ing system zero point. 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
registers; 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) Mounting offset ć specifies the offset between the measuring system zero point and the axis
zero point. It is a signed value; the arrow direction indicated corresponds to a positive numeric
value. The mounting offset 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 corresp. 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 posi. 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 drive; corresponds to the ordered length, also indicated on the type plate.
(J) Measuring system length; corresponds to the ordered length, also 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.
[L] Electric reserve of the measuring system (0.3 %). This is used to monitor the electrical connecĆ
tion. When selecting the measuring system and the drive, the following relationship between
the lengths must be observed: 0.994 * (J)
ţ (G) ţ (F)