Dv/Dt Filter Plus Voltage Peak Limiter - Siemens SINAMICS S120 Function Manual

8.7

dv/dt filter plus Voltage Peak Limiter

Overview
The "du/dt filter plus Voltage Peak Limiter" function is only available for vector control.
Function description
The dv/dt filter plus Voltage Peak Limiter consists of the following components:
● dv/dt reactor
● Voltage Peak Limiter (VPL)
The VPL cuts the voltage peaks off and feeds the energy back into the DC link.
The function should preferably be used for operation with motors for which the dielectric
strength of the insulation system is unknown or insufficient. Standard motors of the 1LA5, 1LA6
and 1LA8 series require the use of the function for supply voltages > 500 V +10%.
With motor cable lengths of < 150 m, the function limits the rate of voltage rise to values < 500 V/
µs and the typical voltage peaks to the following values:
● Voltage peaks ÛLL (typically) < 1000 V for V
● Voltage peaks ÛLL (typically) < 1250 V for 660 V < V
Restrictions
NOTICE
Damage to the dv/dt filter from exceeding the maximum pulse frequency
Inadmissibly high pulse frequencies can damage the du/dt filter.
● Do not exceed maximum permissible pulse frequency.
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:
– Shielded cables: Max. 300 m
– Unshielded cables: Max. 450 m
● Further restrictions are contained in the following device manuals:
– SINAMICS S120 AC Drive
– SINAMICS S120 air-cooled Chassis power units
– SINAMICS S120 Chassis power units, liquid-cooled
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
8.7 dv/dt filter plus Voltage Peak Limiter
< 575 V
line
< 690 V
line
Basic functions
321