Dv/Dt Filter Plus Vpl - Siemens SINAMICS S120 Function Manual

Basic functions

6.5 dv/dt filter plus VPL

6.5 dv/dt filter plus VPL
Description
The dv/dt filter plus VPL consists of two components, the dv/dt reactor and the voltage
limiting network (Voltage Peak Limiter), which limits voltage peaks and returns the energy to
the DC link.
The dv/dt filter plus VPL is to be used for motors for which the voltage strength of the
insulation system is unknown or insufficient. Standard motors of the 1LA5, 1LA6 and 1LA8
series only require them at supply voltages > 500 V +10 %.
The dv/dt filter plus VPL limit the rate of voltage rise to values < 500 V/µs and the typical
voltage peaks to the values below (with motor cable lengths of < 150 m):
< 1000 V at U
< 1250 V at 660 V < U
When a dv/dt filter with Voltage Peak Limiter is used, the maximum permissible pulse
frequency of the Power Module or Motor Module is 2.5 kHz (chassis power units up to 250
kW at 400 V) or 4 kHz (chassis power units from 250 kW to 800 kW at 400 V). If a higher
pulse frequency is set, then this could destroy the dv/dt filter.
Restrictions
The following restrictions must be taken into account when a dV/dt filter is used:
● The output frequency is limited to a maximum of 150 Hz.
● Maximum permissible motor cable lengths:
● Other restrictions: see the Equipment Manual.
Commissioning
The dv/dt filter must be activated when commissioning the system (p0230 = 2).
204
< 575 V
line
< 690 V
line
WARNING
– Shielded cables: max. 300 m
– Unshielded cables: max. 450 m
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions