Program features 45
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 (
), or taken from another parameter. This position is set as the value of the
position counter (
) when the source selected by
, such as a proximity switch connected to a digital input, is
activated. A successful initialization is indicated by bit 4 of
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 (
) 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.
-2147483
8
+2147483
(Proximity switch) Source set by
1
0
1
0
1
0
1
0
1
0
1
0
(Initialization inhibit) Source set by
bit 4,
(Re-init request) Source set by
Drive fault
(Initial value) Source set by
(by default,
)
bit 5,
Position counter re-init disabled
0
Summary of Contents for ACS860
Page 1: ... ABB INDUSTRIAL DRIVES ACS860 primary control program Firmware manual ...
Page 4: ......
Page 10: ...10 Table of contents ...
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 54: ...54 Program features ...
Page 78: ...78 Program features ...
Page 90: ...90 Application macros ...
Page 342: ...342 Additional parameter data ...
Page 380: ...380 Fault tracing ...
Page 381: ...Fault tracing 381 ...
Page 382: ...382 Fault tracing ...
Page 436: ...436 Control chain diagrams ...
