ABB ACH550-UH User Manual page 282

1-278
Actual values
As described earlier in
values.
Actual value scaling
For Actual Values, scale the feedback integer using the parameter's resolution. (See
Complete parameter descriptions
Feedback
1
10
Where parameters are in percent, the
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.
Fieldbus adapter
Control
Parameter
Integer Resolution
0.1 mA
0.1%
Parameter
Resolution
0.1% 1500 rpm
0.1% 500 Hz
interface, Actual Values are words containing drive
section for parameter resolutions.) For example:
(Feedback Integer) * (Parameter Resolution) =
1 * 0.1 mA = 0.1 mA
10 * 0.1% = 1%
Complete parameter descriptions
Value of the (Feedback Integer) * (Parameter Resolution) *
Parameter that
defines 100%
1
10 * 0.1% * 1500 RPM / 100% = 15 rpm
2
100 * 0.1% * 500 Hz / 100% = 50 Hz
ACH550-UH User's Manual
Scaled Value
section
(Value of 100% Ref.) / 100% =
Scaled Value
MOT NOM SPEED
MOT NOM FREQ