Festo Контроллеры двигателя SFC-LAC - Manual (Page 34)

1. System overview
1−16
Festo GDCP−SFC−LACI−IO−EN en 0812NH
Special features of homing
to reference switch If a reference signal is not found when homing to the referĆ
ence switch before the drive reaches a fixed stop or a limit
switch, then the drive will reverse and searches for the switch
in the opposite direction. If a reference signal is found there,
the drive runs through the switching range of the reference
switch. The homing point is subsequently the following index
pulse at the end of the switching range.
to limit switch If a reference signal is not found when homing to the limit
switch before the drive reaches a fixed stop, then homing
is interrupted and a homing error is registered.
Note
Homing error due to incorrect positioning of the limit
switches
· Position the limit switches such that the switching range
extends over the nearest fixed stop (or end position).
There must no range between the limit switch and fixed
stop (or end position) in which the limit switch is not
actuated (undefined range).
· Note that ferritic elements (e.Ăg. mounting attachments)
in the vicinity of magnetic switches can move the
switching range.