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12.2
Parallel connection for redundancy
Two power supplies must be connected in parallel to provide 1+1 redundancy if especially
high demands are placed on the safe and secure supply of a system. Two identical power
supplies can be coupled with one another using SITOP redundancy modules. When one of the
devices fails, then the other automatically takes over supplying the load.
Figure 12-2
Note
When dimensioning the system, it must be ensured that n+1 redundant connected power
supplies can handle the total power requirement of the remaining n power supplies.
Note
For a high reliability of the supply, it is recommended that the redundant switched power
supplies are fused separately on the line-side and, if possible, be connected to different line
supplies. Single-phase power supplies should be connected to different phases of a supply
system.
You can find additional information at:
Manual SITOP Expansion Modules
(https://support.industry.siemens.com/cs/ww/en/view/109768676)
SITOP PSU8400
Equipment Manual, 04.2024, A5E52642642-1-76
Redundant configuration with two power supplies and one redundancy module
12.2 Parallel connection for redundancy
Applications
97
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