Fieldbus References; Reference Selection And Correction - ABB ACS350 User Manual

Fieldbus references

Reference selection and correction

Fieldbus reference (called COMM in signal selection contexts) is selected by setting
a reference selection parameter –
COMM*AI1. When
fieldbus reference is forwarded as such without correction. When parameter
1106
analog input AI1 as shown in the following examples.
Reference correction examples for ABB Drives profile
Setting
COMM+AI1
Corrected
reference
1500 rpm
750 rpm
0 rpm
0%
Corrected
reference
1500 rpm
1200 rpm
750 rpm
300 rpm
0 rpm
1103 REF1 SELECT or
is set to COMM+AI1 or COMM*AI1, the fieldbus reference is corrected using
When COMM > 0
COMM(%) · (MAX-MIN) + MIN
+ (AI(%) -50%) · (MAX-MIN)
AI = 100%
AI = 50%
AI = 0%
100%
50%
AI = 100%
AI = 50%
AI = 0%
0%
50% 100%
Maximum limit is defined by parameter
Minimum limit is defined by parameter
1103 or 1106 – to COMM, COMM+AI1 or
1106 REF2 SELECT is set to COMM, the
COMM
REF (%)
Min limit
Max limit
Max limit
Min limit
COMM
REF (%)
COMM
REF (%)
Min limit
Max limit
Max limit
Min limit
COMM
REF (%)
1105 REF1 MAX /
1104 REF1 MIN /
Fieldbus control with embedded fieldbus
When COMM < 0
COMM(%) · (MAX-MIN) - MIN
+ (AI(%) -50%) · (MAX-MIN)
-100% -50%
AI = 100%
AI = 50%
AI = 0%
-50%
-100%
AI = 100%
AI = 50%
AI = 0%
1108 REF2 MAX.
1107 REF2 MIN.
249
1103 or
0%
0 rpm
-7500 rpm
-1500 rpm
Corrected
reference
0%
0 rpm
-300 rpm
-750 rpm
-1200 rpm
-1500 rpm
Corrected
reference