1-278 ACH550-UH User’s Manual
Fieldbus adapter
Actual values
As described earlier in Control interface, Actual Values are words containing drive
values.
Actual value scaling
For Actual Values, scale the feedback integer using the parameter’s resolution. (See
Complete parameter descriptions section for parameter resolutions.) For example:
Where parameters are in percent, the Complete parameter descriptions 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:
1. Assuming, for the sake of this example, that the Actual Value uses parameter 9908 MOT NOM SPEED
as the 100% reference, and that 9908 = 1500 rpm.
2. Assuming, for the sake of this example, that the Actual Value uses parameter 9907
MOT NOM FREQ
as the 100% reference, and that 9907 = 500 Hz.
Actual value mapping
See the user’s manual supplied with the FBA module.
Feedback
Integer
Parameter
Resolution
(Feedback Integer) * (Parameter Resolution) =
Scaled Value
1 0.1 mA 1 * 0.1 mA = 0.1 mA
10 0.1% 10 * 0.1% = 1%
Feedback
Integer
Parameter
Resolution
Value of the
Parameter that
defines 100%
(Feedback Integer) * (Parameter Resolution) *
(Value of 100% Ref.) / 100% =
Scaled Value
10 0.1% 1500 rpm
1
10 * 0.1% * 1500 RPM / 100% = 15 rpm
100 0.1% 500 Hz
2
100 * 0.1% * 500 Hz / 100% = 50 Hz
To Next Page
Loading...
