Load-Side Components And Cables; Motor Reactors; Dv/Dt Filters Plus Vpl; Sine-Wave Filters - Siemens SINAMICS G130 Engineering Manual

SINAMICS G130
Engineering Information

4.10 Load-side components and cables

4.10.1

Motor reactors

The fast switching of the IGBTs in the inverter causes a high voltage rate-of-rise dv/dt at the inverter output. If long
motor cables are used, these voltage gradients increase the current load on the converter output due to capacitive
charge/discharge currents. The length of cable which may be connected is therefore limited.
The high voltage rate-of-rise and the resulting voltage spikes at the motor terminals, increase the voltage stress at
the motor winding in comparison to direct line operation. The motor reactors reduce the capacitive charge/discharge
currents in the motor supply cables and limit the voltage rate-of-rise dv/dt at the motor terminals according to the
motor cable length.
For a more detailed description, please refer to the section "Motor reactors" of the chapter "Fundamental Principles
and System Description".
4.10.2

dv/dt filters plus VPL

The dv/dt filter plus VPL and the dv/dt filter compact plus VPL comprise two components, i.e. the dv/dt reactor and
the voltage limiting network (Voltage Peak Limiter), which limits voltage spikes and returns the energy back to the DC
link.
The dv/dt filter plus VPL and the dv/dt filter compact plus VPL must be used when the dielectric strength of the
insulation system on the motor to be connected is unknown or inadequate. Siemens standard and trans-standard
asynchronous motors generally require a filter (depending on the motor range) only with line supply voltages of
> 460 V or > 500 V in cases where no special insulation is provided on the motor side. Further information can be
found in chapter "Motors".
The dv/dt filter plus VPL limits the voltage rate-of-rise to values < 500 V/µs and the typical voltage spikes on the
motor to the values below:
·
V (typically) < 1000 V
PP
·
V (typically) < 1250 V
PP
The dv/dt filter compact plus VPL limits the voltage rate-of-rise to values of < 1600 V/ms and the typical voltage spikes
on the motor to the following values:
·
V (typically) < 1150 V
PP
·
V (typically) < 1400 V
PP
For a more detailed description, please refer to section "dv/dt filters plus VPL and dv/dt filters compact plus VPL" in
chapter "Fundamental Principles and System Description".
4.10.3

Sine-wave filters

Sine-wave filters are LC low-pass filters and constitute the most sophisticated filter solution. They are significantly
more effective than dv/dt filters in reducing the voltage rates-of-rise dv/dt and peak voltages V
sine-wave filters imposes substantial restrictions in terms of the possible pulse frequency settings and voltage and
current utilization of the motor-side inverter (voltage and current derating).
For a more detailed description and for the derating data, please refer to the section "Sine-wave filters" of the chapter
"Fundamental Principles and System Description".
4.10.4

Maximum connectable motor cable lengths

The table shows the maximum connectable motor cable lengths. The values apply to the motor cable types
recommended in the table as well as to other types of cable.
SINAMICS G130
Line supply voltage
400 V / 500 V / 690 V
Without reactor or filter
380 V – 480 V 3AC
500 V – 600 V 3AC
660 V – 690 V 3AC
Permissible motor cable lengths for SINAMICS G130
SINAMICS Engineering Manual – November 2015
300/528
Ó Siemens AG
for V
Line
for 660 V < V
Line
for V
Line
for 660 V < V
Line
Rated power at
e.g. Protodur NYCWY
110 kW - 560 kW
110 kW - 560 kW
75 kW - 800 kW
< 575 V
< 690 V
< 575 V
< 690 V
Maximum permissible motor cable length
Shielded cable
300 m
300 m
300 m
, but operation with
PP
Unshielded cable
e.g. Protodur NYY
450 m
450 m
450 m