PPA5xx/15xx user manual
7-15
7.6 MATHS – custom result computation
Non-standard results may be computed from a
combination of voltage and current parameters, signals on
the torque and speed inputs, and constants.
There are 3 formulae, each combining up to 4 terms:
1: (term1 + term2) / (term3+term4)
2: (term1 + term2) x term3 / term4
3: term1 x term2 / (term3+term4)
Each term comprises a result, scaled by a signed factor, or
a signed constant.
For example, consider the formula:
maths = Vpk.Apk / 2
Select formula 2 with:
term1 = voltage peak x 1.0
term2 = disabled
term3 = current peak x 1.0
term4 = constant x 1.414
or
term1 = voltage peak x 1.0
term2 = disabled
term3 = current peak x 0.7071
term4 = disabled
The selected formula is applied to the data from each
phase.
The result is displayed with a user definable label of up to
12 characters and units up to 8 characters.
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