Program features 41
Control of a supply unit (LSU)
General
If the drive has separately-controlled supply and inverter units (also known as line-
side 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 HW options word 1. 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 01 Actual values.
Settings
• Parameters 01.102…01.164 (page 120), 05.111…05.121 (page 130),
06.36…06.43 (page 138), 06.116…06.118 (page 144), 07.106…07.107 (page
147), 30.101…30.149 (page 269), 31.120…31.121 (page 281), 95.20 HW options
word 1 (page 416) and 96.108 LSU control board boot (page 428).
• Parameter groups 60 DDCS communication (page 364), 61 D2D and DDCS
transmit data (page 377), 62 D2D and DDCS receive data (page 381) and
94 LSU
control (page 409).
To Next Page
Loading...
