7 Additional settings
l Encoder with Hall signals
Hall signals can be used for an initial determination of the commutation position if a
digital incremental encoder is used. Following a reset, the commutation position
can be determined with an accuracy of 30° using the Hall signals. This is sufficient
for a starting process. The commutation position will then be corrected based on
the segment limits and when the index pulse occurs for the first time, so that it
corresponds to the specified angle encoder offset.
When this option is selected, the system will display further options concerning the
Hall generator interface.
Hall generator settings
l Offset
The offset describes the angle difference between the permanent magnets of the
rotor and the zero position of the Hall signals. This value is determined during the
automatic angle encoder identification process and it should not be entered or
optimised manually.
l Phase sequence
The phase sequence indicates the way of counting ("direction of rotation") of the
Hall signals and depends on the wiring. The correct setting of the phase sequence
is essential for the operation of the system. A manual determination of the phase
sequence is difficult. We recommend performing an automatic determination (see
above).
l Size of segment
The segment size indicates the angular range covered by one segment of a Hall
signal, e.g. U. Information about the segment size can be found on the data sheet
of the angle encoder. Standard Hall systems have a segment size of 120°. A
segment size of 60° is reserved for special variants.
l After Hall segment switch
Here, you can select various options to specify how the commutation will continue
after the first Hall segment change.
The option Block commutation means that the commutation position is determined
only on the basis of the Hall signals. As a result, the commutation position is
quantised very roughly, and the motor develops high losses. This option is
reserved for special applications.
The option Sine commutation means that the commutation position will be
corrected after the first Hall segment change. Then, it will be determined based on
the incremental position information. This option leads to an optimum resolution
and an optimum behaviour concerning the commutation position. We recommend
using this option.
The option Sine commutation supported with Hall means that the commutation
position will be corrected whenever the Hall segment changes. The commutation
position will be calculated incrementally until the next change occurs. This option is
useful in the case of highly disturbed signals in order to be able to continuously
update the commutation position.
Product manual BL 4000-C Page 140 of 298
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