ACS550 User’s Manual
241
Fieldbus adapter
Actual Value scaling
For Actual Values, scale the feedback integer using the parameter’s resolution. (See
section
on page
for parameter resolutions.) For example:
Where parameters are in percent, the
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:
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
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.
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