Permissible Line System Types; Motor Circuit Diagram - Siemens SIMOTICS T-1FW6 Configuration Manual

9.1

Permissible line system types

Permissible line system types and voltages
The following table shows the permissible line voltages of TN line supply systems for the motors.
Table 9-1
Permissible line sup‐
ply voltage
400 V
480 V
When using the SINAMICS S120 drive system, the motors are always approved for operation
on the following line supplies:
• TN line systems with grounded neutral point
• TT line systems with grounded neutral point
• IT line systems
When operated on IT line systems, a protective device should be provided 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 protects the winding insulation from excessive stress.
9.2

Motor circuit diagram

The circuit diagram of a stator looks like this:
Figure 9-1
1FW6 Built-in torque motors
Configuration Manual, 09/2022, A5E52220645B AA
Permissible line voltages of TN line supply systems, resulting DC link voltages and
converter output voltages
resulting DC link voltage U
600 V (controlled)
528 V (uncontrolled)
634 V (uncontrolled)
Circuit diagram of a stator
9.2 Motor circuit diagram
Converter output voltage (rms val‐
DC
ue) U
a max
425 V (controlled)
380 V (uncontrolled)
460 V (uncontrolled)
Electrical connection
427