Description of the Software Modules and Parameters
Parameter manual b maXX BM5800
Document No.: 5.16029.03
681
of 814
3
6.29 Motor I
2
t threshold
I
2
t warning limit at motor overload
See also ZOverload monitoring of the motor (I
2
t)– from page 717
Standardization: 100% Maximum thermal load of the motor
6.30 Motor total current smoothed
The effective value of the motor current is shown.
Total current actual value in 2 ms cycle calculated from filtered d and q current.
(Filter time constant 1.25 ms)
6.32 Motor real power smoothed
From the motor-voltages and currents calculated instantaneous value of the electrical ef-
fective power p
e real
, in kW. The calculation is based on a symmetrical three-phase sys-
tem.
whereat the following internal sizes are determined in the controller:
i
sd
, i
sq
Motor currents in dq-coordinates (in A, actual values).
u
sd
, u
sq
Calculated motor voltages in dq-coordinates (in V, phase voltage
actual values);
The dead time voltages are compensated with 100%,
independent of the value of the dead time compensation factor
Z47.50–, i.e. it doesn't matter if the dead time compensation in
the motor is active or not. See ZFig. 115– on page 456.
The parameter >6.32< accords to the smoothed value of p
e real
.
Filter time constant: adjustable in parameter Z6.42–
The uncertainty in the power indication is determined by current and voltage measuring
uncertainties (at the voltage it is the efficiency uncertainty).
Therefore it is recommended to carry out the dead time measuring (see chapter ZAuto-
tuning of Current Controller– from page 181). Typically the uncertainty of the power indi-
cation is at +/- 2% of the nominal power of the device.
e real
1000 3 u
sd
i
sd
u
sq
i
sq
+= in kW
NOTE!
The BM5XXX isn't a measuring device and may not replace a power measuring de-
vice. The value shown in the parameter >6.32< is just a benchmark
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