Siemens SINAMICS G130 Engineering Manual page 30

Fundamental Principles and System Description
Engineering Information
Range E
Range E comprises short supply voltage dips of any magnitude, the duration of which is up to 50 ms. During this
time, the current required by the load is delivered entirely by the DC link capacitors, whereby the DC link voltage
decreases. The DC link voltage then only does not reach the under-voltage trip level, if the DC link is discharged
more slowly than in range D. Therefore, the drive can only be operated with no load. The auxiliaries, which are
supplied with 230 V directly from the supply via the internal transformer, do not remain in operation.
Dips in Range E are, therefore, only permissible if the auxiliaries are supplied from a secure, external supply and the
drive is in no-load operation.
Range F
Range F comprises supply voltage dips, the magnitude and duration of which is so large, that, independently of the
load, a fault trip due to under-voltage in the DC link cannot be avoided.
Dips in range F are, therefore, not permissible.
Permissible supply voltage dips with the regulated SINAMICS Active Infeed
In order to explain the behaviour of SINAMICS drives with self-commutated, regulated Infeeds, all theoretically
possible supply voltage dips with regard to magnitude and duration are divided into six, different ranges, named A to
F. In the following diagram, these ranges are shown for regulated SINAMICS Infeeds, whereby each range
corresponds to different boundary conditions and, therefore, to a different behaviour of the drive.
Division of all supply voltage dips according to magnitude and duration in the ranges
A to F for the description of the behaviour of SINAMICS drives with regulated Infeeds
Range A
Range A comprises supply voltage dips, the magnitude of which is in the long and short-term ranges of permissible
supply voltage variations.
Dips in range A are, therefore, permissible, with the restriction that the DC link voltage and the drive power decrease
in proportion to the magnitude of the supply voltage dips.
Range B
Range B comprises supply voltage dips, the magnitude of which reaches values of V
regulated operation, the DC link voltage can be maintained at its pre-set value, as long as the reduced supply voltage
can be compensated for with an increased input current. The auxiliaries supplied with 230 V via the internal
transformer, do not, however, remain in operation.
SINAMICS Engineering Manual – May 2008
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© Siemens AG
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