Operating Modes
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
656
of 820
4.8
Hints to achieve best possible performance
1 PWM switching frequencies recommended: 2 kHz and 4 kHz
2 The auto-tuning of the current regulator and the identification of the magnetizing curve
(Lh characteristic) must be executed to measure optimal parameters for motor model
and for compensation of the power unit nonlinearity.
3 Parameter Dead time compensation Z47.50– may be decreased in small steps of 1%
in the range 100% - 90% to reduce the speed ripple and to improve starting perfor-
mance.
4 Parameter Flux estimator gain Z163.1– may be increased in range 250 - 750 to
achieve smooth operation at low speed and to improve starting performance.
5 Parameter Minimum speed threshold OL Z161.1– can be decreased, if the operation
with frequency bellow 1 Hz is required or if smooth starting is needed. But the reliability
and repeatability of starting may be affected.
6 Parameter Minimum speed delay OL Z161.2– may be decreased to lock the flux esti-
mation and prevent the loss of motor control at stand still.
If the drive does not follow a deceleration ramp, e.g. drive in current limit, the parameter
may be increased to allow speed control down to zero.
7 Auto-tuning of the speed regulator (closed loop analysis) is not possible at open loop
control. The Ks Scaling factor
Z18.40– must be calculated accordingly to the following
equitation:
8 Adjust the parameter Slip frequency warm Z107.16– which corresponds to rated motor
slip at rated load to decrease speed estimation error.
9 At enabling of the regulator the field current follows a ramp to build the flux. With pa-
rameter Magnetization time Z160.1– the length of the ramp can be set.
Motor parameters needed for commissioning
Nominal voltage Z107.8–
Nominal current Z107.9–
Nominal speed Z107.7–
Nominal frequency Z107.13–
Pole pairs Z107.19–
Magnetic current Z107.14–
Slip frequency warm Z107.16–
4.8.11.2 Catch on Fly
Catch on Fly for openloop asynchronous motors allows to engage the motor to an already
rotating axis respectively load.
K
s
K
t
J
-----
360
o
2
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=
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