Chapter 4 – Twelve–Pulse Serial / Sequential Configurations with DCS 600
II F2
4 - 6 DCS 600 Manual for 12 – Pulse Operation
Sequential mode The sequential mode will be activated if parameter
(47.01) within the
settings for 12 – pulse serial operation
(15.16) = [3] or (15.16) = [4] is
selected. The data transmission in the 12 – pulse link is equal to
the serial mode.
SEQUENTIAL 0: NORMAL Both converters are
MODE controlled with an equal
(47.01) firing angle
1: SEQUENTIAL Sequential control of the
firing angles; only one unit
changes its firing angle,
while the firing angle of the
other unit is at minimum or
maximum value.
Controller ad-
justment (se-
rial / sequential
mode)
Autotuning has not yet been implemented in 12 – pulse mode. It is
proposed to determine the controller values using a unit in normal
(6 – pulse) operation; in this case the output voltage will only be
half of that value available in 12 – pulse serial mode. The values
determined must then be appropriately corrected in 12 – pulse
mode:
• It can be assumed, that the values for P-gain (43.02), I-gain
(43.03) and Discontinuous Current Limit (43.06) will be ap-
proximately halved.
• The values for parameters ARM L (41.11) and ARM R (41.12)
have to be halved, since the measured voltage values have
been halved at the moment of measurement.
Extra commutation reserve (parameter DXN
(42.03)):
This parameter is effective only, if current feedback is also
present. If settings are made here, the current feedback
has to be present both at the 12 – pulse master and the
12 – pulse slave unit.
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