Siemens SINAMICS S120 Configuration Manual page 41
Synchronous motors
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- Function manual (1094 pages) ,
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Converter output voltage
The converter output voltages differ according to the converter type and supply voltage.
Table 4-2
SINAMICS S 120
3AC 380 - 480 V
SINAMICS S 120
1AC 230 V
Torque limit for operation on converter without field weakening option
The voltage induced in the motor winding increases as the speed increases. The difference
between the DC link voltage of the converter and the induced motor voltage can be used
to apply the current.
For converters without field weakening option, this limits the amount of applicable current.
This causes the torque to drop off quickly at high speeds. All operating points that can be
achieved with the motor lie to the left of the voltage limiting characteristic line.
Figure 4-2
The shape of the voltage limiting characteristic curve is determined by the winding version
(armature circuit) and the magnitude of the converter output voltage.
Synchronous Motors 1FK7
Configuration Manual, (PFK7S), Edition 12.2006, 6SN1197-0AD16-0BP1
Converter voltages
Converter type
AC/AC device
Speed-torque diagram, examples for various winding versions
Infeed
Supply
module
voltage
U
supply
ALM
400 V
SLM
400 V
SLM
480 V
230 V
Electrical data
4.2 Voltage limiting characteristics
DC link voltage
Output voltage
U
DC link
600 V
528 V
634 V
300 V
U
mot
425 V
380 V
460 V
180 V
41
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