ABB ACS880-01 Series, Firmware Instructions

Page: 128 / 664

128 Program features
Note that “ Analog src ” type parameters (see page 503 ) expect a 32-bit real (floating
point) source – in other words, parameters 47.01 … 47.08 can be used as a value
source 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 368 ).

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. If the Safe torque off (STO) function is in use, install jumpering in the STO wiring
in place of the missing module (unless the module was the last on the chain).
5. Install an air baffle to the top module guide to block the airflow through the empty
module bay.
6. In case the inverter unit has a DC switch with a charging circuit, disable the
appropriate channel on the xSFC-xx charging controller.