Lenze 8400 - Page 557

Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23 557
8 Basic drive functions (MCK)
8.6 Homing
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Start and search profile data set
Certain referencing modes use two different profile data sets for homing in order to shorten the
homing time and, at the same time, increase accuracy.
• At first, a quick approach of the limit switch/pre-stop mark (depending on the selected mode)
is carried out using the start profile data set.
• After reversing at the limit switch/pre-stop mark, the search profile data set results in slower –
but more accurate – approaching of the touch probe sensor.
 Tip!
The result of setting a lower search speed in C01224/2
and a high search acceleration in
C01225/2
is that deceleration to search speed takes place quickly and position detection is
exact (at slower search speed).
 Note!
For a reference search with touch probe detection:
• The touch probe signal source can be selected in C01246/1
.
•Go to C02810/x
and select the edge, the digital input used for the connection of the
touch-probe sensor is to respond. In the Lenze setting of C02810/x
, no touch probe is
detected!
•Moreover, no
"acceptance window" must be set in C2813/x and C02814/x for
accepting the touch probe signal in order that a touch probe will always be detected
independent of the position.
Touch probe detection
( 357)
Start profile data set Search profile data set
C01224/1
Start speed C01224/2 Search speed
C01225/1
Start acceleration
(deceleration as well)
C01225/2 Search acceleration
(deceleration as well)
C01226/1
S-ramp time
(identical in the two profile data sets)
C01226/1 S-ramp time
(identical in the two profile data sets)
 Note!
A changeover to the search profile data set is only carried out of the search speed has
been set to (C01224/2
) > "0"!
The exact time of the changeover to search profile data set occurs in the respective
homing mode is indicated in the process descriptions of the homing modes.