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52 Program features
Any subsequent initialization of the counter must first be enabled by
. To define a time window for initializations,
can be used to inhibit the signal from the proximity switch. An
active fault in the drive will also prevent counter initialization.
Encoder error handling
When an encoder is used for load feedback, the action taken in case of an encoder
error is specified by
. If the parameter is set to
, the
calculation will continue smoothly using estimated motor position. If the encoder
recovers from the error, the calculation will smoothly switch back to encoder
feedback. The load position signals (
and
) will continue to be
updated all the time, but bit 6 of
will be set to indicate
potentially inaccurate position data. In addition, bit 4 of
will be cleared upon the
next stop as a recommendation to reinitialize the position counter.
Parameter
Pos counter error and boot action
defines whether position
calculation resumes from the previous value over an encoder error or control unit
reboot. By default, bit 4 of
indicating that reinitialization is needed. With
set to
, the position values are retained over an error or reboot; bit 6 of
is set
however to indicate that an error occurred.
Note:
With a multiturn absolute encoder, bit 6 of
is cleared at the next stop of
the drive if the encoder has recovered from the error; bit 4 is not cleared. The status
of the position counter is retained over a control unit reboot, after which position
calculation resumes from the absolute position given by the encoder, taking into
account the initial position specified by
WARNING!
If the drive is in stopped state when an encoder error occurs, or if
the drive is not powered, parameters
,
and
are not
updated because no movement of the load can be detected. When using previous
position values (
Pos counter error and boot action
), be aware that the position data is unreliable if the load is able to
move.
Reading/writing position counter values through fieldbus
The parameters of the position counter function, such as
and
, can be accessed from an upper-level control
system in the following formats:
•
16-bit integer (if 16 bits are sufficient for the application)
•
32-bit integer (can be accessed as two consequent 16-bit words).
For example, to read parameter
through fieldbus, set
the selection parameter of the desired dataset (in group 52) to
Other
–
, and
select the format. If you select a 32-bit format, the subsequent data word is also
automatically reserved.
Содержание ACS880-x04
Страница 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Страница 4: ......
Страница 18: ...18 Using the control panel ...
Страница 24: ...24 Control locations and operating modes ...
Страница 111: ...Application macros 111 Fieldbus control macro This application macro is not supported by the current firmware version ...
Страница 112: ...112 Application macros ...
Страница 496: ...496 Additional parameter data ...
Страница 544: ...544 Fault tracing ...
Страница 602: ...602 Control chain diagrams ...