Parameter listing and descriptions
199
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
REF
1
MIN
or
1107
REF
2
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
REF
1
MAX
or 1108
REF
2
MAX
.
• See the figure for parameter 1105.
1303
FILTER AI1
0…10 s
Defines the filter time constant for analogue input 1 (
AI
1).
• 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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