Rated Data And Continuous Operation Of The Converters - Siemens SINAMICS G130 Engineering Manual

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Rated data and continuous operation of the converters

Main applications
SINAMICS S150 cabinets are designed to meet high requirements in terms of dynamic response and control
accuracy and operate with a high-quality vector control. Standard models are equipped with a sensorless vector
control. SINAMICS S150 cabinets are also available with an optional speed encoder interface (SMC30) which allows
operation with TTL/HTL incremental encoders (option K50).
They feature a highly dynamic, pulsed, IGBT-based rectifier/regenerative unit for 4Q operation. This regulates the DC
link voltage and stabilizes it at a constant value irrespective of the level of line voltage fluctuation. The factory setting
for the DC link voltage corresponds to 1.5 times the parameterized line supply voltage. These converters are
therefore ideal for operation on unstable power supply systems with a high level of line voltage fluctuation.
The Clean Power Filter on the line side ensures minimum harmonic effects on the supply in operation. These units
are therefore also ideal for applications which demand an extremely high standard of supply quality.
Line supply voltages
SINAMICS S150 cabinets are available for the following line supply voltages:
•
380 V – 480 V 3AC
•
500 V – 690 V 3AC
The permissible voltage tolerance is ±10 % continuously and -15 % for brief periods (< 1min). Please note that the
output voltage and thus the output power can be kept constant by virtue of the stabilized DC link voltage provided
that sufficient line current reserves are available.
Usable output currents
The output currents specified in the selection and ordering data can be utilized over the entire frequency or speed
setting range, i.e. even at very low output frequencies down to zero speed.
The specified rated output current is the maximum continuous thermally permissible output current. The units have
no additional overload capacity when operating at this current.
Overload capability, load duty cycle definitions
When a drive is required to overcome breakaway torques or is subjected to high surge loads, its configuration must
take these factors into account. In such instances, it must be operated on the basis of a base load current which is
lower than the rated output current. Overload reserves are available for this purpose. The load duty cycles for
operation with low and high overloads are defined below.
•
The base load current I
•
The base load current I
These overload values apply on condition that the converter is operated at its base load current before and after the
period of overload on the basis of a load duty cycle duration of 300 s in each case.
Converter current
Short-time current
1.1 I
L
I
N
I
L
60 s
Load duty cycle definition for low overload
for low overload is based on a load duty cycle of 110% for 60 s or 150% for 10 s.
L
for a high overload is based on a load duty cycle of 150% for 60 s or 160% for 10 s.
H
Rated current (continuous)
Base load current I
L
for low overload
300 s
t
Engineering Information
Converter current
Short-time current
Rated current (continuous)
1.5 I
H
I
N
I
H
60 s
Load duty cycle definition for high overload
SINAMICS Engineering Manual - May 2008
SINAMICS S150
Base load current I
H
for high overload
300 s
t
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