82 ACS 400 User’s Manual
Group 13: Analog Inputs
Example. To set the minimum allowed analog input value to 4 mA, value for parameter 1301
MINIMUM AI1 (1304 MINIMUM AI2) is calculated as follows:
Value (%) = Desired minimum value / Full range of the analog input * 100%
= 4 mA / 20 mA * 100%
= 20%.
Note! In addition to this parameter setting, the analog input must be configured for 0-20 mA current
signal. Refer to section CROSSREF.
Code Description
1301 MINIMUM AI1
Relative minimum value of AI1 (%). This value corresponds to the minimum reference set by parameter
1104
EXT REF1 MIN or 1107 EXT REF2 MIN. Minimum AI cannot be greater than maximum AI.
See Figure 27 on page 80.
1302 MAXIMUM AI1
Maximum value of AI1 (%). This value corresponds to the maximum reference set by parameter 1105
EXT
REF1 MAX or 1108 EXT REF2 MAX.
See Figure 27 on page 80.
1303 FILTER AI1
Filter time constant for analog input AI1. As the analog input value changes, 63 % of the change takes place
within the time specified by this parameter.
Note! Even if you select 0 s for the filter time constant, the signal is still filtered with a time constant of 25 ms
due to the signal interface hardware. This cannot be changed by any parameters.
Figure 28 Filter time constant for analog input AI1.
1304 MINIMUM AI2
Minimum value of AI2 (%). This value corresponds to minimum reference set by parameter 1104
EXT REF1
MIN or 1107 EXT REF2 MIN. Minimum AI cannot be greater than maximum AI.
1305 MAXIMUM AI2
Maximum value of AI2 (%). This value corresponds to maximum reference set by parameter 1105
EXT REF1
MAX or 1108 EXT REF2 MAX.
1306 FILTER AI2
Filter time constant for AI2. Refer to parameter 1303
FILTER AI1.
100
63
[%]
t
Unfiltered signal
Filtered signal
Time constant
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