Encoder Error Handling - ABB ACS880 Manual

(Proximity switch) Source set by 90.67
(Initialization inhibit) Source set by 90.68
bit 4, Pos counter init ready
bit 5, Position counter re-init disabled
(Re-init request), Source set by 90.69
(initial value) Source set by 90.59
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,
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
set to indicate potentially inaccurate position data. In addition, bit 4 of
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
an error, indicating that reinitialization is needed. With
value, the position values are retained over an error or reboot; bit 6 of
however to indicate that an error occurred.
1
0
1
0
90.35 1
0
90.35 1
0
0
Drive fault 1
0
+2147483647
90.07
0
(by default, 90.58
-2147483648
90.68 can be used to inhibit the signal from the proximity
Program features 57
90.35
90.35 is cleared after
90.60 set to Continue from previous
90.35 will be
will be
90.35 is set