Redundancy Mode Power Units - Siemens SINAMICS S120 Function Manual

6.21

Redundancy mode power units

Requirement
● Parallel connection is only possible for the same power units of the Chassis or Chassis-2
format
● Maximum of 4 power units in parallel for the Chassis format
● Maximum of 6 power units in parallel for the Chassis-2 format
Note
For the following power units, when commissioning, a firmware version ≥ V5.2 must be
available.
● Active Line Modules in the Chassis-2 format
● Motor Modules in the Chassis-2 format
● Parallel connection of power units with suitable power reserves
● Motor with one single-winding system (p7003 = 0)
● No Safe Torque Off (STO)
Function description
Note
System standstill
Due to feedback effects caused by a lack of galvanic separation, the entire system may come
to a standstill despite a redundancy circuit.
Redundancy mode is suitable for replacing a defective or failed power unit in parallel operation
and continue operation. Before the damaged or failed power unit is removed, it must be
deactivated via p0125 or via the binector input p0895. If a power unit is replaced, it must be
reactivated after it is installed.
Features
● Redundancy for up to 4 power units for the Chassis format
● Redundancy for up to 6 Motor Modules for the Chassis-2 format
● Power unit can be deactivated via parameter (p0125)
● Power unit can be deactivated via binector input (p0895)
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p0125[0...n]
● r0126[0...n]
● p0895[0...n]
● p7003
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Activate/deactivate power unit component
Power unit components active/inactive
BI: Activate/deactivate power unit component
Par_circuit winding system
Vector control
6.21 Redundancy mode power units
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