ABB ACS880 - Control of a Supply Unit (LSU); General; Communication

The update intervals of the data sets are as follows:
• Data sets 10…11: 2 ms
• Data sets 12…13: 4 ms
• Data sets 14…17: 10 ms
• Data sets 18…25, 32, 33: 100 ms.
Settings and diagnostics
Parameter groups: 60 DDCS communication (page 441), 61 D2D and DDCS transmit
data (page 457) and 62 D2D and DDCS receive data (page 462).
Events: 7581 DDCS controller comm loss (page 557) and A7CA DDCS controller comm
loss (page 572).
￭ Control of a supply unit (LSU)
General
If the drive has separately-controlled supply and inverter units (also known as lineside
and motor-side converters), the supply unit can be controlled through the inverter unit.
For example, the inverter unit can send a control word and references to the supply
unit, enabling the control of both units from the interfaces of one control program.
With ACS880 single drives, the two control units are connected at the factory. In ACS880
multidrives (drive systems with one supply unit and multiple inverter units), the feature
is not typically used.
Communication
The communication between the converters and the drive consists of data sets of three
16-bit words each. The inverter unit sends a data set to the supply unit, which returns
the next data set to the inverter unit.
The communication uses data sets 10 and 11, updated at 2 ms intervals. Data sets 10
is sent by the inverter unit to the supply unit, while data set 11 is sent by the supply unit
to the inverter unit. The contents of the data sets are freely configurable, but data set
10 typically contains the control word, while data set 11 returns the status word.
The basic communication is initialized by parameter 95.20. This will make several
parameters visible (see below).
If the supply unit is regenerative (such as an IGBT supply unit), it is possible to send a
DC voltage and/or reactive power reference to it from inverter parameter group 94 LSU
control. A regenerative supply unit will also send actual signals to the inverter unit which
are visible in parameter group 1 Actual values.
Program features 45