Operating Instructions ACU
low moment of inertia and/or a small load moment.
In operation modes 10 to 15, it cannot be ruled out that a wrong direction of rotation is determined
in quick synchronization. For example, a frequency not equal to zero may be determined although
the drive is at a standstill. If there is no overcurrent, the drive is accelerated accordingly. The
direction of rotation is defined in operation modes 11, 14 and 15.
The synchronization changes the parameterized starting behavior of the selected configuration. First,
the start command activates the search run in order to determine the rotary frequency of the drive.
In operation modes 1 to 5, the Current / Rated Motor Current 647 is used for synchronization as a
percentage of Rated Current 371.
Current / Rated Motor Current
The sensorless control is extended for the search run by a compensated proportional regulator,
which regulates the parameterized Current / Rated Motor Current 647. The proportional and
integrating part of the current controller can be set via parameters
Amplification 648 and Integral Time 649. The control functions can be deactivated by setting the
parameters to 0.
If the Operation Mode Synchronisation 645 parameter was set to operation mode 1 to 5 (search
run), the search run is not started before the Demagnetizing Time 633 has elapsed.
If synchronization to the drive mechanism is not possible, the Braking Current 631 is impressed
into the motor in operation modes 1 to 5 for the duration of the Brak. Time after Search Run 646.
The impression of the direct current set in the parameters of the direct current brake leads to a
heating of the motor and should only be done for a short period in internally ventilated motors
Brak. time after search run
The search run function is designed for operation with motors without brake. Brake
motors my not be operated perfectly with the search run function (depending on
parameterization and brake control.
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