Descriptions of functions
10.27 Operation on a single-phase line supply
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
599
Figure 10-74 Connection to a single-phase line supply
The converter is connected to the line supply (one phase and the neutral conductor, e.g.
230 V or two phase conductors of a three-phase line supply, e.g. 400 V) via terminals 1U1
and 1V1. Connection 1W1 remains free.
It is mandatory that a single-phase line reactor or a transformer with 4% u
k
is provided, which
only supplies the DC converter involved.
Commutating reactor and transformer should be selected according to the rated motor
current of the armature circuit.
In this B2 circuit, the line current is equal to the DC current in the armature circuit. All of the
other line-side drive components should be dimensioned according to this. Further, due to
the higher current ripple when compared to six-pulse operation, a smoothing reactor must be
provided in the DC circuit. Please contact the motor manufacturer when dimensioning the
smoothing reactor.
Selecting operation on a single-phase line supply with
The high current ripple in this mode causes ripple in the actual speed. For smooth
speed control, it is recommended to set the actual speed smoothing to approx. 10 ms
(p50200 = 10 ms)
When selecting operation on a single-phase line supply, the rated DC current (r50072[1]) is
automatically reduced to 67% of the value for 3-phase operation. The reason for this is the
uneven distribution of the current in the thyristors in the power unit of the drive converter.
As a consequence, the rated output voltage is also reduced. See also Chapter "Technical
data (Page 39)".
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