SINAMICS S120
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
357/528
6.5 Precharging of the DC link and precharging currents
6.5.1 Basic Infeed
Basic Line Modules with thyristors
In the case of SINAMICS S120 thyristor-based Basic Line Modules in frame sizes FB, FBL, GB and GBL, which are
available as S120 Chassis (air-cooled and liquid-cooled) and S120 Cabinet Modules, the DC link is precharged by
varying the firing angle of the rectifier thyristors (phase angle control). The firing angle is increased continuously for 1
second until it reaches the full firing angle setting. These modules do not feature a separate precharging circuit.
SINAMICS S120 thyristor-based Basic Line Modules: Precharging by phase angle control of the thyristor firing angle
The following table specifies the rms values of the line currents which occur at the beginning of the precharging
process in the case of line supply voltages 400 V or 690 V. These values are based on the assumption that the
maximum possible DC link capacitance must be precharged. The maximum possible capacitance values for the
relevant Basic Line Modules can be found in the next section. Where other line voltage values and / or other DC link
capacitance values apply, the precharging current values must be converted in proportion to the line voltage and / or
DC link capacitance.
The specified precharging currents decay during precharging until the process is completed after a period of typically
1 to 2 s. The precharging principle based on phase angle control means that precharging is a virtually loss-free
process which means that there are no mandatory minimum intervals between precharging operations (in contrast to
resistor-based precharging circuits).
S120 BLM output
at 400 V or 690 V
Frame size Output
Input current
at 400 V or 690 V
Precharging
principle
Line current at the beginning of DC link
precharging (initial rms value)
at 400 V or 690 V
380 V – 480 V 3AC
FB 200 kW 365 A Phasenanschnitt 146 A
FB 250 kW 460 A Phasenanschnitt 184 A
FBL 360 kW 610 A Phase angle control 244 A
FB 400 kW 710 A Phasenanschnitt 284 A
GB 560 kW 1010 A Phasenanschnitt 404 A
FBL 600 kW 1000 A Phase angle control 400 A
GB 710 kW 1265 A Phasenanschnitt 506 A
GBL 830 kW 1420 A Phase angle control 568 A
500 V – 690 V 3AC
FB 250 kW 260 A Phasenanschnitt 130 A
FB / FBL 355 kW 375 A / 340 A Phase angle control 188 A
FB 560 kW 575 A Phasenanschnitt 288 A
FBL 630 kW 600 A Phase angle control 300 A
GB 900 kW 925 A Phasenanschnitt 463 A
GB / GBL 1100 kW 1180 A / 1070 A Phase angle control 590 A
GBL 1370 kW 1350 A Phase angle control 675 A
S120 thyristor-based Basic Line Modules: Line currents at the beginning of precharging (initial rms values)
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