Drive Dimensioning
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
517/528
4th step Option selection Further notes and alternatives
Complete the motor
Order No.
Define options for special versions
and tests.
See "Special versions" Catalog D86.2 / Chapter 2.
5th step Motor current calculation Further notes and alternatives
Motor currents
Motor rated
current for torque
of 16 000 Nm in
continuous duty at
690 V
1425 A See "Selection and ordering data" Catalog D86.2 / page 2/4.
(16 000/16 500) x 1470 = 1425 A
Required motor
current for max.
torque of 18 000
Nm (brief overload
torque)
1603 A
(18 000 / 16 000) x 1425 = 1603 A
6th step
Selection of the converter or the
S120 Motor Module
Further notes and alternatives
Select the SINAMICS
S120 system
Rated output
current I
≥ 1603 A
Due to the amper-
age of 1603 A, the
current must be
distributed bet-
ween two Motor
Modules.
802 A per
Motor Module
1603/2 = 802 A
Derating factor for
two parallel Motor
Modules
0.95 See section "Parallel connections of converters" in this
engineering manual
Current required
per Motor Module
844 A 802/0.95 = 844 A
Intermediate
result for Motor
Module selection
910 A,
900 kW
Derating factor for
increasing the
pulse frequency to
2.5 kHz for the
900 kW Motor
Module
0.87 The derating factors are dependent on the converter type and
converter output. They can be found in the chapters on specific
unit types in this engineering manual.
Max. output
current of both
Motor Modules
1504 A (too
low, because
1603 A is
needed!)
2 x 910 A x 0.95 x 0.87 = 1504 A
Selection of the
next largest Motor
Module
1025 A,
1000 kW
Derating factor for
increasing the
pulse frequency to
2.5 kHz for the
1000 kW Motor
Module
0.86 The derating factors are dependent on the converter type and
converter output. They can be found in the chapters on specific
unit types in this engineering manual.
Max. output
current of both
Motor Modules
1675 A
(sufficient)
2 x 1025 A x 0.95 x 0.86 = 1675 A
SINAMICS S120 Vector Control:
2 Single Motor Modules
Order No. 6SL3320-1TG41-0AA3
The relevant Infeed must be selected as well.
SINAMICS S120 Cabinet Modules:
2 Motor Modules
Order No. 6SL3720-1TG41-0AA3
The relevant Infeed must be selected as well.
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