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

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Load-side components and cables

Motor reactor

The fast switching of the IGBTs in the inverter causes 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. In conjunction with the connected cable capacitances, the motor
reactors (option L08) reduce the capacitive charge/discharge currents in the motor cables and, as a function of the
motor cable length, limit the voltage rate of rise dv/dt and the voltage peaks V
For a more detailed description, please refer to the section "Motor reactors" of the chapter "Fundamental Principles
and System Description".

dv/dt filter plus VPL

The dv/dt filter plus VPL (option L10) consists of two components, the dv/dt reactor and the voltage limiting network
(Voltage Peak Limiter), which limits voltage peaks and returns the energy back to the DC link.
The dv/dt filter plus VPL must be used for motors for which the withstand voltage of the insulation system is unknown
or insufficient. Motors in the 1LA and 1LG ranges require this type of filter only when they are connected to a supply
voltage exceeding 500 V +10 % and no special insulation is used on the motor.
The dv/dt filter plus VPL limits the voltage rate of rise to values < 500 V/µs and the typical voltage spikes at the motor
to the values below:
•
V (typically) < 1000 V for V
PP
•
V (typically) < 1250 V for 660 V < V
PP
For a more detailed description, please refer to the section "dv/dt filters plus VPL" of the chapter "Fundamental
Principles and System Description".

Sine-wave filter

Sine-wave filters are LC low-pass filters and constitute the most sophisticated filter solution. They are significantly
more effective than dv/dt filters plus VPL in reducing the voltage rate of rise dv/dt and peak voltages V
operation with 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".

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 tables as well as to all other types of motor cable.
Line supply voltage Output power at
400 V resp. 690 V
Without reactor or filter
380 V – 480 V 3AC 110 kW - 800 kW
500 V – 690 V 3AC
With one motor reactor (option L08)
380 V – 480 V 3AC 110 kW - 800 kW
500 V – 690 V 3AC
Permissible motor cable lengths for SINAMICS S150
< 575 V
Line
< 690 V
Line
e.g. Protodur NYCWY
75 kW - 1200 kW
75 kW - 1200 kW
PP
Maximum permissible motor cable length
Shielded cable
300 m
300 m
300 m
300 m
SINAMICS Engineering Manual - May 2008
SINAMICS S150
Engineering Information
at the motor terminals.
Unshielded cable
e.g. Protodur NYY
450 m
450 m
450 m
450 m
© Siemens AG
, but
PP
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