ABB ACS880 Series, Руководство по прошивке

Страница: 95 / 764

(Proximity switch) Source set by 90.67 1
0
(Initialization inhibit) Source set by 90.68 1
0
90.35 1
bit 4, Pos counter init ready 0
90.35 1
bit 5, Position counter re-init disabled 0
(Re-init request), Source set by 90.69 0
Drive fault 1
0
+2147483647
90.07
0
(initial value) Source set by 90.59
(by default,
90.58
-2147483648
The position counter is initialized by setting a known physical position of the load
into the control program. The initial position (for example, the home/zero position,
or the distance from it) can be entered manually in a parameter (
90.58 ), or taken
from another parameter. This position is set as the value of the position counter
(
90.7 ) when the source selected by 90.67 , such as a proximity switch connected
to a digital input, is activated. A successful initialization is indicated by bit 4 of
90.35 .
Any subsequent initialization of the counter must first be enabled by 90.69 . To
define a time window for initializations, 90.68 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
90.55 . If the parameter is set to Warning , 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 (
90.4 , 90.5 and 90.7 ) will continue to be updated all the time, but
bit 6 of 90.35 will be set to indicate potentially inaccurate position data. In addition,
bit 4 of 90.35 will be cleared upon the next stop as a recommendation to reinitialize
the position counter.
Parameter 90.60 defines whether position calculation resumes from the previous
value over an encoder error or control unit reboot. By default, bit 4 of 90.35 is
cleared after an error, indicating that reinitialization is needed. With 90.60 set to
Program features 95