￭ 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 408).
￭ 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 105
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