Redundance Operation Power Units - Siemens SINAMICS S120 Function Manual

5.21

Redundance operation power units

Redundancy mode can be used so that operation can be continued in spite of the failure of
one power unit connected in parallel.
Note
Despite this redundancy circuit, the entire plant may shut down when defects develop in a
power unit (feedback effects due to absence of electrical isolation).
In order that the failed power unit can be replaced, DRIVE-CLiQ cables must be connected
in a star-type configuration - it may be necessary to use a DRIVE-CLiQ HUB Module
(DMC20 or DME20). The failed power unit must be deactivated via p0125 or via the binector
input p0895, before it is removed. When a replacement power unit has been installed it must
be activated accordingly.
Requirements
● Only possible for identical chassis power units connected in parallel
● Maximum number of parallel power units is 4
● Parallel connection of power units with suitable power reserves
● DRIVE-CLiQ star topology (possibly a DMC20 or a DME20, see
● Motor with one single-winding system (p7003 = 0)
● No Safe Torque Off (STO)
Features
● Redundancy for up to 4 chassis power units
● 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
• r0126
• p0895[0...n]
• p7003
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
SINAMICS S120 Control Units Manual)
Activate/deactivate power unit component
Power unit components active/inactive
BI: Activate/deactivate power unit component
Par_circuit winding system
5.21 Redundance operation power units
Vector control
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