Redundance Operation Power Units - Siemens SINAMICS S120 Function Manual

4.21

Redundance operation power units

Features
● Redundancy for up to 4 chassis power units
● Power unit can be de-activated via parameter (p0125)
● Power unit can be de-activated via binector input (p0895)
Description
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 one
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). 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
● Parallel connection only works with equivalent (order number) chassis power units.
● Maximum number of parallel power units is 4
● Firmware version ≥ V2.4
● Parallel connection of power units with suitable power reserves
● DRIVE-CLiQ star topology (possibly a DMC20, refer to the Equipment Manual)
● Motor with one single-winding system (p7003 = 0)
● No safe standstill
Integration
The boot function with partial topologies is integrated in the system as follows.
● p0125 Activate/de-activate power unit component
● r0126 Power unit component active/inactive
● p0895 BI: Activate/deactivate power unit component
● p7003 Par_circuit winding system
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
4.21 Redundance operation power units
Vector control
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