320 Fieldbus control with embedded fieldbus
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 ABB drives profile.
Setting
When COMM > 0
When COMM < 0
COMM(%)
· (MAX-MIN) + MIN
+ (AI(%) - 50%) · (MAX-MIN)
COMM(%) · (MAX-MIN) - MIN
+ (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
(%)
100
50
0
AI = 50%
AI = 0%
AI = 100%
COMM
REF
(%)
Corrected
reference
(rpm)
0
-750
-1500
-100
-50
0
Max. limit
Min. limit
AI = 50%
AI = 100%
AI = 0%
Corrected
reference
(rpm)
Max limit
Min limit
COMM
REF
(%)
100
50
0
1500
750
0
1200
300
AI = 50%
AI = 0%
AI = 100%
COMM
REF
(%)
0
-750
-1500
-100
-50
0
-300
-1200
Corrected
reference
(rpm)
Max. limit
Min. limit
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 ...