ACH550-UH User’s Manual
211
Serial Communication – FBA
description on the range and scaling of the
REFERENCE
, see the user’s manual
supplied with the FBA module.
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
"Parameter Descriptions" section for parameter resolutions.) For example:
Where parameters are in percent, the "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.
Generic Profile
Reference
Range
Reference
Type
Scaling
Remarks
REF
Fieldbus
specific
Speed
-100% = -
(par. 9908)
0 = 0
+100 =
(par. 9908)
Final reference limited by
1104/1105.
Actual motor speed limited by 2001/
2002 (speed).
Frequency
-100% = -
(par. 9907)
0 = 0
+100 =
(par. 9907)
Final reference limited by
1104/1105.
Actual motor speed limited by 2007/
2008 (frequency).
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