ABB RCNA-01 Manuel d'utilisateur Page 197

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Parameter listing and descriptions 193
ACH550-01 User's Manual
Group 13: ANALOGUE INPUTS
This group defines the limits and the filtering for analogue inputs.
Code Description Range
1301 MINIMUM AI1 0…100%
Defines the minimum value of the analogue input.
Define value as a percentage of the full analogue signal range. See
example below.
The minimum analogue input signal corresponds to 1104
REF1 MIN or
1107
REF2 MIN.
MINIMUM AI cannot be greater than MAXIMUM AI.
These parameters (reference and analogue min. and max. settings)
provide scale and offset adjustment for the reference.
See the figure for parameter 1105.
Example. To set the minimum analogue input value to 4 mA:
Configure the analogue input for 0…20 mA current signal.
Calculate the minimum (4 mA) as a percentage of the full range
(20 mA) = 4 mA / 20 mA · 100% = 20%
1302 MAXIMUM AI1 0…100%
Defines the maximum value of the analogue input.
Define value as a percentage of the full analogue signal range.
The maximum analogue input signal corresponds to 1105
REF1 MAX
or 1108
REF2 MAX.
See the figure for parameter 1105.
1303 FILTER AI1 0…10 s
Defines the filter time constant for analogue input 1 (
AI1).
The filtered signal reaches 63% of a step change within the time
specified.
1304 MINIMUM AI2 0…100%
Defines the minimum value of the analogue input.
•See
MINIMUM
AI
1 above.
100
63
[%]
Unfiltered signal
Filtered signal
Time constant
t
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