Motor Operating Mode
Parameter manual b maXX BM5800
Document No.: 5.16029.03 Baumüller Nürnberg GmbH
672
of 814
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
m Maximum frequency: double nominal frequency
m Minimum frequency: is limited by load inertia and actual remaining flux
m High DC link voltage (> 560 V) and a low stator resistance can lead to wrong detection
of motor operation conditions
Adjustment aid
m 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 ZSensorless control, at stator flux
oriented– from page 671 have been completed during commissioning.
m If a DC link overvoltage error occurs during catch operation, parameterize Z167.3–
Catch demagnetization time
m If a overcurrent error occurs during catch operation, parameterize Z167.3– Catch de-
magnetization time
m During catch operation, the actual speed value Z18.22– settles to the actual rotor
speed. Overshoots of over 30% might occur. Take this into account to parameterize
the overspeed limits.
Required parameters
m Catch enable Z167.1–
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:
m Rho electrical Z47.47–
m Actual flux current Z146.15–
m Ke factor Z107.20–
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