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8. Operating modes
Festo P.BE-CMMP-CO-SW-EN 0708NH
167
Method -18: Reference travel to the positive stop
With this method, the drive first moves in a positive direction until it reaches the stop.
The I
2
t integral of the motor rises hereby to a maximum 90 %. The stop must be
mechanically dimensioned so that it does not suffer damage in the parameterised
maximum current. The zero position refers directly to the stop.
Fig. 8.14: Reference travel to the positive stop
Methods 33 and 34: Reference travel to the zero pulse
The zero position refers to the first zero pulse of the angle transmitter in the direction of
search.
Fig. 8.15: Reference travel only with reference to the zero pulse
Method 35: Reference travel to the current position
With method 35, the zero position refers to the current position.
If the drive should not be newly referenced but only the position set to a specified value,
the object
2030
h
(
set_position_absolute
) can be used. See chapter 6.7.2.
8.2.4
Control of Reference Travel
Reference travel is controlled and monitored through the
controlword
/
statusword
. The
start is made by setting bit 4 in the
controlword
. The successful completion of the travel is
shown by a set bit 12 in the object
statusword
. A set bit 13 in the object
statusword
shows that an error has occurred during the reference travel. The cause of the error can be
determined via the objects
error_register
and
pre_defined_error_field
.
Bit 4
Meaning
0
Homing run is not active
0
1
Start homing
1
Homing run is active
1
0
Homing run interrupted
Tab. 8.1: Description of the bits in the controlword
Summary of Contents for CMMP Series
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