ABB ACS550-01 User Manual page 199

ACS550 User's Manual
Actual Value Scaling
For Actual Values, scale the feedback integer using the parameter's resolution. (See
"Complete Parameter List for ACS550" section for parameter resolutions.) For
example:
Feedback
Integer
1
10
Where parameters are in percent, the "Complete Parameter List for ACS550"
section specifies what parameter corresponds to 100%. In such cases, to convert
from percent to engineering units, multiply by the value of the parameter that defines
100% and divide by 100%. For example:
Feedback
Integer
10
100
1. Assuming, for the sake of this example, that the Actual Value uses parameter 9908
as the 100% reference, and that 9908 = 1500 rpm.
2. Assuming, for the sake of this example, that the Actual Value uses parameter 9907
as the 100% reference, and that 9907 = 500 Hz.
Actual Value Mapping
See the user's manual supplied with the FBA module.
Parameter
Resolution
0.1 mA
0.1%
Value of the
Parameter
Parameter that
Resolution
defines 100%
0.1% 1500 rpm
2
0.1% 500 Hz
(Feedback Integer) * (Parameter Resolution) =
Scaled Value
1 * 0.1 mA = 0.1 mA
10 * 0.1% = 1%
(Feedback Integer) * (Parameter Resolution) *
(Value of 100% Ref.) / 100% =
1
10 * 0.1% * 1500 RPM / 100% = 15 rpm
100 * 0.1% * 500 Hz / 100% = 50 Hz
Scaled Value
MOT NOM SPEED
MOT NOM FREQ
Fieldbus Adapter
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