Actual Value Scaling - Daikin ACS320 Operation 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 starting on
For example:
Feedback Integer Parameter Resolution
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
Integer Resolution
10 0 .1% 1800 rpm1
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
(Feedback Integer) * (Parameter Resolution) = Scaled Value
Value of the Parameter
that defines 100% * (Value of 100% Ref .) / 100% = Scaled Value
10 * 0 .1% * 1800 RPM / 100% = 18 rpm
page 30 for parameter resolutions . )
(Feedback Integer) * (Parameter Resolution)
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