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Operating Modes
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
Baumüller Nürnberg GmbH
656
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
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
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
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
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
must be calculated accordingly to the following
equitation:
8
Adjust the parameter Slip frequency warm
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
the length of the ramp can be set.
Motor parameters needed for commissioning
Nominal voltage
Nominal current
Nominal speed
Nominal frequency
Pole pairs
Magnetic current
Slip frequency warm
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
-----------
=
Содержание b maXX BM2500
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