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Motor Operating Mode
Parameter manual
b maXX
BM5800
Document No.: 5.16029.03
Baumüller Nürnberg GmbH
672
3.9
3.9.2.2 Catch on Fly
Catch on Fly for openloop asynchronous motors allows to engage the motor to an already
rotating shaft respectively load.
Features
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Maximum frequency: double nominal frequency
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Minimum frequency: is limited by load inertia and actual remaining flux
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High DC link voltage (> 560 V) and a low stator resistance can lead to wrong detection
of motor operation conditions
Adjustment aid
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For a successful catch on fly of the motor, the exact knowledge of the motor parame-
ters is inevitable, especially dead time compensation as well as rotor and stator resis-
tance. Make sure, that all steps described in chapter
Sensorless control, at stator flux
from page 671 have been completed during commissioning.
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If a DC link overvoltage error occurs during catch operation, parameterize
Catch demagnetization time
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If a overcurrent error occurs during catch operation, parameterize
Catch de-
magnetization time
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During catch operation, the actual speed value
settles to the actual rotor
speed. Overshoots of over 30% might occur. Take this into account to parameterize
the overspeed limits.
Required parameters
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Catch enable
NOTE!
The encoderless control of the asynchronous motors introduced here, oriented to-
wards the stator flux (SFOC) is a special case compared with the rotor flux oriented
control (RFOC). Additionally for this procedure internally own field weakening control-
ler, flux controller, coordinate transformation angles and EMC feedforward were im-
plemented, which are not available to the user. Furthermore the following parameters
have no meaning or have informative purposes:
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m
Actual flux current
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Содержание b maXX BM5800
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