76 Program features
Note that only 32-bit floating point (type real32) parameters can be selected as the
source of another parameter value. In other words, parameters 47.01…47.08 can be
used as value sources of other parameters while 47.11…47.28 cannot.
To use a 16-bit integer (received in DDCS data sets) as the source of another
parameter, write the value into one of the real32 type storage parameters
(47.01…47.08). Select the storage parameter as the source, and define a suitable
scaling method between the 16-bit and 32-bit values in parameters 47.31…47.38.
Settings
Parameter group 47 Data storage (page 244).
Reduced run function
A “reduced run” function is available for inverter units consisting of parallel-connected
inverter modules. The function makes it possible to continue operation with limited
current even if one (or more) module is out of service, for example, because of
maintenance work. In principle, reduced run is possible with only one module, but the
physical requirements of operating the motor still apply; for example, the modules
remaining in use must be able to provide the motor with enough magnetizing current.
Activation of the reduced run function
Note: For cabinet-built drives, the wiring accessories and the air baffle needed during
the procedure are available from ABB, and are included in the delivery.
WARNING! Follow the safety instructions provided for the drive or
inverter unit in question.
1. Disconnect the supply voltage and all auxiliary voltages from the drive/inverter
unit.
2. If the inverter control unit is powered from the faulty module, install an extension
to the wiring and connect it to one of the remaining modules.
3. Remove the module to be serviced from its bay. See the appropriate hardware
manual for instructions.
4. Install an air baffle to the top module guide to block the airflow through the empty
module bay.
5. In case the inverter unit has a DC switch with a charging circuit, disable the
appropriate channel on the xSFC-xx charging controller.
6. Switch on the power to the drive/inverter unit.
7. Enter the number of inverter modules present into parameter 95.13 Reduced run
mode.
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