Function library
7-53
L
EDSVS9332P-D21 EN 3.0
7.5.8.5 Homing mode 2 and 3
Purpose
•
Homing in absolute positioning mode (C1210 = 0, 2), with finite traversing range and existing
travel range limit switches (POS-LIM-xxx).
•
The homing switch (POS-REF-MARK) is always found. In worst case the entire traversing
range will be searched.
Approach end of travel range limit switch, reverse and move to reference point via homing
switch
Mode 2: Traversing direction to positive end of travel range limit switch
Set C1213 = 2.
9300pos053
H o m i n g s w i t c h ( P O S - R E F - M A R K )
Z e r o p u l s e / z e r o p o s i t i o n
E n d o f
t r a v e l s w i t c h
( P O S - L I M - P O S )
H o m e p o s i t i o n
E n d o f
t r a v e l s w i t c h
( P O S - L I M - N E G )
Fig. 7-23 Move to POS-LIM-POS, reverse, move to reference point via POS-REF-MARK
Function procedure
•
Move to positive travel range limit switch with homing speed C1242.
•
Reverse there and move beyond the reference switch to the reference point with homing
speed C1242. In this case, no fault (PO2) is indicated!
•
The reference point is at the first zero pulse / zero position of the position encoder after leaving
the homing switch.
•
If the drive is already on the positive end of travel range limit switch before homing, it is
reversed immediately.
•
If the drive is positioned at the reference switch when homing is started, the switch will be
overridden. The drive then goes on to the limit switch and reverses there.
Modus 3: Traversing direction to negative end of travel range limit switch
Set C1213 = 3.
Function procedure
•
As ”Traversing direction to positive end of travel range limit switch”, but the drive moves
towards the negative end of travel range limit switch.
•
No fault indication (PO2)
Tip!
The limit switch (POS-LIM-xxx) can be used as homing switch (POS-REF-MARK) at the same time
to save initiators.
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