ABB ACH550-01 User Manual page 207

ACH550 User's Manual
Group 13: ANALOGUE INPUTS
This group defines the limits and the filtering for analog inputs.
Code Description
1301 MINIMUM AI1
Defines the minimum value of the analog input.
• Define value as a percentage of the full analog signal range. See
example below.
• The minimum analog input signal corresponds to 1104
1107 2
REF
•
MINIMUM AI
• These parameters (reference and analog min. and max. settings)
provide scale and offset adjustment for the reference.
• See the figure for parameter 1105.
Example. To set the minimum analog input value to 4 mA:
• Configure the analog 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
Defines the maximum value of the analog input.
• Define value as a percentage of the full analog signal range.
• The maximum analog input signal corresponds to 1105
1108 2
REF
• See the figure for parameter 1105.
1303 FILTER AI1
Defines the filter time constant for analog input 1 (
• The filtered signal reaches 63% of a step change within the time
specified.
1304 MINIMUM AI2
Defines the minimum value of the analog input.
• See
MINIMUM AI
Parameter listing and descriptions
.
MIN
cannot be greater than
.
MAX
[%]
100
63
Time constant
1 above.
Range
0...100%
.
MAXIMUM AI
0...100%
0...10 s
1).
AI
Unfiltered signal
Filtered signal
t
0...100%
1 or
REF MIN
1 or
REF MAX
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