Shifting The Zero Angle; Maximum Distance For Zero Pulse Detection; Procedure Of A Homing To Switch Only - Baumuller b maXX BM3000 Operating Manual

4.8
Operating Modes
m Phase 1
m Phase 2
m Phase 3

4.8.3.2 Shifting the zero angle

When referencing under consideration of the Zero angle or Zero pulse, it may be near the
switch tolerances of the reference switch. This may result in the detection of two different
home positions with multiple homings that are one revolution apart. The zero angle or
zero pulse is then not always recognized in the same encoder revolution due to the switch
tolerances.
With Incremental encoders with zero pulse the encoder or switch must in this case be
mounted differently so that the zero pulse is no longer near the switch tolerances.
With absolute encoders, the encoder zero angle can be offset using Parameter
encoder offset for internal calculation so that it is outside of the tolerances of the switch.
The measured angle on the reference switch is indicated in Parameter
chanical angle on the Reference switch.

4.8.3.3 Maximum distance for zero pulse detection

A maximum distance can be preset at encoders with zero pulse, which may be moved
after the switching edge until the zero pulse is detected.
If the zero pulse is not detected within this distance, "Homing" error no. 901 homing is
reported and homing is interrupted.

4.8.3.4 Procedure of a Homing to switch only

The zero pulse or zero angle is not evaluated with homings to the switch only. Therefore,
the accuracy depends on the switch tolerances of the switch.
584 Parameter manual b maXX BM3000
Document no.: 5.12001.07
of 820
In Phase 1, Homing speed (Z120.5–) is used until the Reference switch is reached.
The acceleration to reach the homing speed is adjusted with
eration.
Starting occurs directly with Phase 2 if the switch has already been set during commis-
sioning.
After the reference switch has been reached, the drive is braked with
deceleration and one eight of the homing speed (however, at least to the homing final
speed) in the reverse direction of travel. It will now be driven out of the switch again.
The falling switch edge of the switch will trigger braking to the
speed. As soon as this speed has been reached, the zero mark will be evaluated. The
drive runs with the homing final speed until the zero pulse or zero angle of the encoder
is detected. When the zero pulse or zero angle is recognized, the drive will be stopped
and the home position will be set.
Maximum travel distance can be preset at encoders with zero pulse in this phase. If the
zero pulse is not detected within this distance, "Homing" error no. 901 is reported and
homing is interrupted.
Z120.7–
Homing accel-
Z120.8–
Homing
Z120.6–
Homing final
Z120.10–
Z120.15–
Baumüller Nürnberg GmbH
me-