Siemens SINAMICS G130 Engineering Manual page 158

Fundamental Principles and System Description
Engineering Information
The charts below show the typical voltage rates-of-rise dv/dt and peak voltages V
and without motor-side reactors and filters, as a function of the motor cable length. The specified peak voltages V
are referred in each case to the rms value of the line supply voltage V
The values apply to converters with line-commutated Infeeds (G130 and G150 converters, and drives with S120
Basic Line Modules and S120 Smart Line Modules) and with shielded motor cables with the recommended cable
cross-sections according to the sections on specific unit types in this engineering manual. Furthermore, the values
apply to steady-state operation. With braking operations of brief duration during which either the V
a braking unit (Braking Module) is active, the values increase in proportion to the increased DC link voltage.
The values are typically about 10 % higher for converters with self-commutated Infeeds (S150 converters and drives
with S120 Active Infeeds) due to the increased DC link voltage.
Typical voltage rates-of-rise at the motor terminals
for SINAMICS drives with line-commutated Infeeds
as a function of the motor cable length
The charts clearly show that dv/dt filters plus VPL, dv/dt filters compact plus VPL as well as sine-wave filters are very
effective at reducing the voltage rates-of-rise and the peak voltages on the motor. Both types of filter are therefore
equally suited for the purpose of successfully operating older motors with unknown winding insulation, or motors
without special winding insulation for converter-fed operation, on SINAMICS converters up to line voltages of 690 V.
More detailed explanations about voltage rates-of-rise dv/dt and peak voltages V
motor-side reactors and filters (physical causes and influencing parameters) can be found in section "Increased
voltage stress on the motor winding as a result of long motor cables".
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG
PP
.
Line
Typical peak voltages V / V
PP
for SINAMICS drives with line-commutated Infeeds
as a function of the motor cable length
PP
at the motor terminals, both with
controller or
dc max
at the motor terminals
Line
at the motor terminals without
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