Diagnosis
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
696
of 820
4.9
u
s
, u
s
Calculated motor voltages in -coordinates (in V, instanta-
neous
values);
(the dead time voltages are compensated, 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)
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
ZAutotuning of Current controller– from page 199). Typically the uncertainty of the power
indication is at +/- 2% of the nominal power of the device.
6.39 Motor I
2
t warning threshold
Settable warning threshold for the motor I
2
t monitoring (see Z6.28– Motor I
2
t actual val-
ue).
If the motor I
2
t actual value Z6.28– exceeds the warning threshold, the warning 219
"Warning threshold motor I
2
t exceeded" is generated. With a fixed hysteresis of 10% be-
low the warning threshold the warning is withdrawn again.
If the value for the warning threshold is 0, there is no warning.
See also ZOverload monitoring of the motor (I
2
t)– from page 731.
Standardization: 100% Maximum thermal load of the motor
6.42 Smoothing time electr. motor power display
Smoothing time constant for the motor real power display Z6.32–.
NOTE!
The BM33XX 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
NOTE!
If the power indication >6.32< is evaluated and PWM frequency changes are made
during operation, the adaption of the dead time compensation must be activated after
the PWM frequency (see
Z123.1– bit 3) independent of the dead time compensation
being active in the motor control or not (see Z47.50–).
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