Operating Instructions ACU
16.3.4 Flux forming finished
If Operation Mode 30 is selected for a digital output, the corresponding output becomes active when
the flux formation is finished. The time for the flux formation results from the operating state of the
machine and the set parameters for magnetizing the machine. The magnetizing can be defined via the
starting behavior and is influenced by the amount of the set starting current.
16.3.5 Brake release
The Brake release function in Operation Mode 41 enables the activation of a corresponding unit via
the digital control output. The function uses both the control commands via the contact inputs and the
set starting and stopping behavior for controlling the digital output.
According to the configured starting behavior, the output is switched on when the magnetizing of the
motor is finished. Once the Brake Release Time 625 has elapsed, the drive will be accelerated.
The stopping behavior of the drive depends on the configuration of the parameters Operation Mode
630. This is described in chapter 13.2 "13.2".
If stopping behavior 2 or 5 with stop function is selected, the drive is controlled to zero speed and the
digital output is not switched off. In the other operation modes of the stop behavior, the control of the
brake is possible. At the start of a free coasting of the drive, the digital output is switched off.
This is similar to the behavior in the case of the stopping behavior with shutdown. The drive is
decelerated and supplied with current for the set holding time. Within the set holding time, the control
output is switched off and thus the brake activated.
Operation Mode "41-Brake release" switches off the digital output
assigned to the function immediately. The mechanical brake is activated.
Stopping behavior
1, 3, 4, 6, 7
Operation Mode "41-Brake release" switches off the digital output
assigned to the function once the Switch-off threshold stop function 637
is reached. The mechanical brake is activated.
Operation Mode “41-Brake release” leaves the digital output assigned to
the function switched on. The mechanical brake remains open.
16.3.6 Current limitation
Operation Modes 15 to 19 link the digital outputs and the relay output to the functions of the
intelligent current limits. The reduction of power by the set figure in percent of the rated current
depends on the selected operation mode. Accordingly, the event for intervention of the current
limitation can be output via the operation modes of the digital outputs. If the function of the
intelligent current limits is deactivated within the sensorless control, operation modes 16 to 19 are
switched off in the same way.
16.3.7 External fan
Operation Mode 43 enables control of an external fan. Via the digital output, the fan is switched on if
the controller is released and Start clockwise or Start anticlockwise are switched on, or if the Switch-
On Temperature 39 for the internal fan was reached.
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