ABB ACS880 Series, Руководство по прошивке

Страница: 143 / 764

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Data storage parameters
Twenty-four (sixteen 32-bit, eight 16-bit) parameters are reserved for data storage.
These parameters are unconnected by default and can be used for eg. linking,
testing and commissioning purposes. They can be written to and read from using
other parameters’ source or target selections.
Note that only 32-bit floating point (type real32) parameters can be selected as
the source of another parameter value. In other words, parameters 47.1 … 47.8 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
( 47.1 … 47.8 ). 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 and diagnostics
Parameter group: 47 Data storage (page 456) .
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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.
The reduced run mask can be used instead of the reduced run mode in case there
is no need to remove the power module physically from the system. Masking a
module or several modules stops BCU from sending control commands to selected
PSL2 channel or channels.
Note:
• STO circuit must remain as it has been.
• Do not use mask to bypass STO circuit faults.
• Do not remove fiber optic cables from the system.
• Module must be disconnected from AC side to avoid current flow through the
freewheeling diodes.
Program features 143