Actual Value Scaling - Daikin MD5 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 . For example:
Feedback Integer
1
10
Where parameters are in percent, the Complete 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 Integer Parameter Resolution
10 0 .1%
100 0 .1%
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 .
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 .
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Parameter Resolution
0 .1 mA
0 .1%
Value of the Parameter that defines 100%
1500 rpm
500 Hz
(Feedback Integer) × (Parameter Resolution) = Scaled Value
1 × 0 .1 mA = 0 .1 mA
10 × 0 .1% = 1%
(Feedback Integer) × (Parameter Resolution) × (Value of 100%
1
2
55
e
Mbedded
Ref .) / 100% = Scaled Value
10 * 0 .1% * 1500 RPM / 100% = 15 rpm
100 * 0 .1% * 500 Hz / 100% = 50 Hz
OM 1191 • MD5 VFD
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