Output Reactor, Dv/Dt Filter, Sinusoidal Filter - Siemens SIMOVERT FC Operating Instructions Manual

08.96
6.5.1

Output reactor, dv/dt filter, sinusoidal filter

When longer feeder cables are used between the converter and motor:
♦ the converter has to cope with additional current peaks due to re-charging the cable capacitances
♦ the motor insulation is additionally stressed as a result of transient voltage spikes caused by reflection.
In order to prevent premature aging of the motor
insulation and thus early failures, the following limit
values may not be exceeded at the motor terminals:
♦ the permissible voltage gradient dv/dt and
♦ the permissible peak voltage between phase
)
conductors V
LL
Fig. 6.3 Permissible limit values for the motor insulation
Depending on the application, the voltagerate-of-rise, voltage and current peaks can be reduced using the
following options: Output reactor, dv/dt filter, or sinusoidal filter.
Characteristics of the output reactors, dv/dt filters and sinusoidal filter:
Reduces the current peaks for long cables
Reduces the voltage gradient (rate of rise) dv/dt at the motor
terminals
Limits the amplitude of the transient voltage peaks at the motor
terminals to the following typical values
≤ 1000 V at 3-ph. AC 500 V to 575 V
≤ 1250 V at 3-ph. AC 660 V to 690 V
Generates sinusoidal motor voltages and currents
Reduces the supplementary losses in the motor
Reduces motor noise (corresponding to direct online operation)
Table 6.8
Siemens AG 6SE7087-6AH70
SIMOVERT MASTER DRIVES
≤ 800 V at 3-ph. AC 400 V to 460 V
Operating Instructions
NOTE
)
V [V]
LL
1500
1460
for motors in accordance with IEC 34-17:1992
(DIN VDE 0530, Part1, Sheet2)
1000
500
*) Standard 1LA8 motors;
1LA8 motors with improvedinsulation are available
Output
reactor
yes
slightly
no
no
no
no
for Siemens 1LA2, 1LA5, 1LA6
and 1LA8*) motors
2 3
1
dv/dt filter
yes
yes
yes
no
no
no
Options
t [ µ s]
4
Sinusoidal
filter
yes
yes
yes
yes
yes
yes
6-5