ABB ACS800 Firmware Manual page 168

168
Index Name/Selection
13.03 SCALE AI1
0 ... 1000%
13.04 FILTER AI1
0.00 ... 10.00 s
13.05 INVERT AI1
NO
YES
13.06 MINIMUM AI2
0 mA
4 mA
TUNED VALUE
TUNE
Actual signals and parameters
Description
Scales analogue input AI1.
Example: The effect on speed reference REF1 when:
- REF1 source selection (parameter 11.03) = AI1
- REF1 maximum value setting (parameter 11.04) = 0 rpm
- REF1 maximum value setting (parameter 11.05) = 1500 rpm
- Minimum AI1 setting (parameter 13.01) = 0 V
- Maximum AI1 setting (parameter 13.02) = 10 V
- Actual AI1 value = 4 V (40% of the full scale value)
- AI1 scaling = 100%
AI1 V DC
10 V
4 V
0 V
Scaling range
Defines the filter time constant for analogue input AI1.
%
Unfiltered signal
100
63
Filtered signal
T
Note: The signal is also filtered due to the signal interface hardware (10 ms
time constant). This cannot be changed with any parameter.
Filter time constant
Activates/deactivates the inversion of analogue input AI1.
No inversion
Inversion active. The maximum value of the analogue input signal corresponds
to the minimum reference and vice versa.
See parameter 13.01.
See parameter 13.01.
See parameter 13.01.
See parameter 13.01.
See parameter 13.01.
Speed Ref
1500 rpm
If the actual value of AI1 is
4 V, then the speed reference
will correspond to
(4 / (10-0)*100) = 40% of
1500 rpm which will be
600 rpm
600 rpm.
0 rpm
-t/T
O = I · (1 - e )
I = filter input (step)
O = filter output
t = time
T = filter time constant
t
FbEq
0 ... 32767
0 ... 1000
0
65535
1
2
3
4