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 starting on
for parameter resolutions .)
For example:
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%
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:
Feedback
Parameter
Value of the Parameter
(Feedback Integer) * (Parameter Resolution)
Integer Resolution
that defines 100%
* (Value of 100% Ref .) / 100% = Scaled Value
10
0 .1%
1800 rpm1
10 * 0 .1% * 1800 RPM / 100% = 18 rpm
100
0 .1%
600 Hz2 100 * 0 .1% * 600 Hz / 100% = 60 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 = 1800 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 = 6 .00 Hz .
Although Actual Value scaling could differ from the above for
the N2 and FLN protocols, it currently does not. To confirm, see
the following sections, as appropriate:
• N2 Analog Input Objects in the N2 Protocol Technical
Data section .
• Scaling Drive Feedback Values in the FLN Protocol
Technical Data section .
Scaling does not apply for the BACnet protocol .
OM 1190-1 • MD4 VFD 80 www .DaikinApplied .com
f
Ieldbus
C
onTrols
Summary of Contents for ACS320
Page 115: ......
