08.2012
Technology Option F01
Siemens AG
6SE7087-6QX70 (Version AN)
SIMOVERT MASTERDRIVES
Compendium Motion Control
9-69
With homing switch only, reference point at left
BERO
+
_
v
A
(MD7)
v
R
(MD6)
If the axis is already on the switch at the beginning of homing, this fact
must be taken into account.
9.4.23.2
Homing with encoder zero mark only
This function is implemented analogously to the description given in
section 9.4.23.1. However, only the zero mark of the encoder is used
as reference signal. For reasons of accuracy, starting should be at
reduced speed.
9.4.23.3
Use of a reversing switch during homing
It was previously necessary during homing to ensure that the reference
point was pointing in the right direction when the axis was at rest. If not,
the axis traveled to the limit switch.
When a reversing switch is also evaluated, the direction of travel is
given either by the homing (same procedure as before) or by the
reversing switch (in which case the axis reverses and looks for the
homing switch in the other direction).
Ref
switch
+
_
Reversng
switch
The reversing switch is always active in homing mode. A digital output
(MD45 = 8) can be used for connecting the reversing switch.
NOTICE
