Permissible Line System Types; Motor Circuit Diagram - Siemens SIMOTICS T-1FW68 Configuration Manual

Electrical connection

8.1 Permissible line system types

8.1 Permissible line system types
Permissible line system types and voltages
The following table shows the permissible TN line supply system voltages for the stator
segments.
Table 8- 1
Permissible
line supply voltage
400 V
480 V
When using the SINAMICS S120 drive system, the stator segments are always certified
for operation on the following line supplies:
• TN line supply systems with grounded neutral point
• TN line supply systems with grounded neutral point
• IT line supply systems
When operated on IT line supply systems, a protective device must be installed that
switches off the drive system in the case of a ground fault.
In operation with a grounded external conductor, an isolating transformer with grounded
neutral (secondary side) must be connected between the line supply and the drive
system. This avoids the winding insulation being inadmissibly stressed.
8.2

Motor circuit diagram

The circuit diagram of a stator segment looks like this:
Figure 8-1
148
Permissible line voltages of TN line supply systems, resulting DC link voltages and
converter output voltages
Resulting
DC link voltage U
600 V (controlled)
720 V (controlled)
Circuit diagram of a stator segment
Converter output voltage
(rms value) U
DC
425 V (controlled)
510 V (controlled)
Configuration Manual, 08/2021, A5E51132930B AA
a max
1FW68 radial segment motors