ABB ACH550-BCR, Руководство пользователя

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2-222 ACH550 E-Clipse Bypass 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
Parameters
section for parameter resolutions.) For example:
Where parameters are in percent, the
Parameters
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