Group 13: Analogue Inputs - ABB ACS 400 User Manual

Group 13: Analogue Inputs

Code Description
1301 MINIMUM AI1
Relative minimum value of AI1 (%). Value corresponds to minimum reference set by parameter 1104
1 or 1107
REF MIN
See Figure 38 on page 71.
1302 MAXIMUM AI1
Maximum value of AI1 (%). Value corresponds to maximum reference set by parameter 1105
or 1108
EXT REF
See Figure 38 on page 71.
1303 FILTER AI1
Filter time constant for analogue input AI1. As the analogue 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 39 Filter time constant for analogue input AI1.
1304 MINIMUM AI2
Minimum value of AI2 (%). Value corresponds to minimum reference set by parameter 1104
1107 2
EXT REF MIN
1305 MAXIMUM AI2
Maximum value of AI2 (%). Value corresponds to maximum reference set by parameter 1105
or 1108
EXT REF
1306 FILTER AI2
Filter time constant for AI2. Refer to parameter 1303
Example. To set the minimum allowed analogue 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 analogue 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 "Connection Examples" on page 22.
ACS 400 User's Manual
2 . Minimum AI cannot be greater than maximum AI.
EXT REF MIN
2 .
MAX
[%]
100
63
. Minimum AI cannot be greater than maximum AI.
2 .
MAX
Unfiltered signal
Filtered signal
Time constant
1.
FILTER AI
t
EXT
1
EXT REF MAX
1 or
EXT REF MIN
1
EXT REF MAX
73