Basic functions
7.7 dv/dt filter plus Voltage Peak Limiter
Drive functions
328 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
dv/dt filter plus Voltage Peak Limiter
The dv/dt filter plus Voltage Peak Limiter consists of two components: The dv/dt reactor and
the voltage limiting network (Voltage Peak Limiter, VPL), which cuts off the voltage peaks
and feeds back the energy to the DC link.
This function is only available for vector control.
The dv/dt filter plus Voltage Peak Limiter is designed for use with 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 Voltage Peak Limiter limits 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):
● Voltage peaks ÛLL (typically) < 1000 V for V
line
< 575 V
● Voltage peaks ÛLL (typically) < 1250 V for 660 V < V
line
< 690 V
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
The maximum permissible pulse frequency when using a du/dt filter:
● For 2.5 kHz
– Chassis power units from 315 kW to 800 kW at 400 V
– Chassis power units from 75 kW to 1200 kW at 690 V
– Chassis power units Innovation at 400 V
● For 4 kHz
– Chassis power units up to 250 kW at 400 V
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