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

Extended Functions

dv/dt filter plus VPL

4.15 dv/dt filter plus VPL
Description
The dv/dt filter plus VPL comprises two components, the dv/dt reactor and the
voltage limiting line voltage value (Voltage Peak Limiter), which removes the
voltage peaks and feeds the energy back into 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 limits the rate of voltage rise to values < 500 V/µs and the
typical voltage peaks to the values below (with motor cable lengths < 150 m):
< 1000 V at V
< 1250 V at 660 V < V
Warning
!
When using a dv/dt filter, the maximum pulse frequency of the drive converter is
2.5 kHz or 4 kHz. 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:
S The output frequency is limited to a maximum of 150 Hz.
S Maximum permissible motor cable lengths:
– Shielded cables: max. 300 m
– Unshielded cables: max. 450 m
S Other restrictions: see the Equipment Manual.
Commissioning
The dv/dt filter must be activated when commissioning the system (p0230 = 2).
4-222
< 575 V
line
< 690 V.
line
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition