346 Fieldbus control with fieldbus adapter
Fieldbus references
Reference selection and correction
Fieldbus reference (called COMM in signal selection contexts) is selected by setting a
reference selection parameter –
or
– to
,
. When parameter
the fieldbus reference is forwarded as such without correction. When parameter
is set to
or
, the fieldbus reference is corrected using
analog input AI1 as shown in the following examples for the DCU profile.
With the DCU profile the fieldbus reference type can be Hz, rpm or
percentage
. In the
following examples the reference is in rpm.
Setting
When COMM > 0 rpm
When COMM < 0 rpm
COMM/1000
+ (AI(%) - 50%) · (MAX-MIN)
COMM/1000
+ (AI(%) - 50%) · (MAX-
MIN)
Maximum limit is defined by parameter
.
Minimum limit is defined by parameter
/
.
AI = 50%
AI = 100%
AI = 0%
1500
Corrected
reference
(rpm)
750
0
Max. limit
Min. limit
COMM
REF
1500000
750000
0
AI = 50%
AI = 0%
AI = 100%
COMM
REF
Corrected
reference
(rpm)
0
-7500
-1500
-1500000 -750000
0
Max. limit
Min. limit
AI = 50%
AI = 100%
AI = 0%
Corrected
reference
(rpm)
Max limit
Min limit
COMM
REF
0
1500
750
0
1200
300
750000 1500000
AI = 50%
AI = 0%
AI = 100%
COMM
REF
0
-750
-1500
0
-300
-1200
Corrected
reference
(rpm)
Max. limit
Min. limit
-750000
-1500000
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...