ABB ACQ550-x1-06A6-2 User Manual page 191

ACQ550-U1 User's Manual
Actual value scaling
The scaling of actual values can be protocol dependent. In general, for Actual
Values, scale the feedback integer using the parameter's resolution. (See
parameter descriptions
Feedback
Integer
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.
Scaling does not apply for the BACnet protocol.
section for parameter resolutions.) For example:
Parameter
(Feedback Integer) * (Parameter Resolution) = Scaled Value
Resolution
0.1 mA 1 * 0.1 mA = 0.1 mA
0.1% 10 * 0.1% = 1%
Value of the
Parameter
Parameter that
Resolution
defines 100%
1
0.1% 1500 rpm
2
0.1% 500 Hz
Complete parameter descriptions
(Feedback Integer) * (Parameter Resolution) *
(Value of 100% Ref.) / 100% = Scaled Value
10 * 0.1% * 1500 RPM / 100% = 15 rpm
100 * 0.1% * 500 Hz / 100% = 50 Hz
191
Complete
section
MOT NOM SPEED
MOT NOM FREQ
Embedded fieldbus