Applications; Redundancy Circuit For Increased System Availability - Siemens SITOP Series Equipment Manual

Applications

9.1

Redundancy circuit for increased system availability

SITOP PSE202U redundancy modules provide additional protection against the failure of 24 V
supplies. By decoupling two power supplies through a redundancy module, a power supply
that fails does not influence the 24 V supply. The redundancy module continuously monitors
the feeding power supplies, and when one device fails, the other one automatically takes
over the complete load circuit supply. In addition, a signal contact sends a signal, which can
be evaluated by a controller, a PC or a control system.
Note
To implement 100% redundancy, the supply via the primary side of the power supply must
also be redundantly implemented; this means that each power supply must be separately
protected using a fuse or a miniature circuit breaker.
When using 1-phase power supplies, the supply should be implemented using different
phases, e.g. if a three-phase line supply is available.
Redundancy of two power supplies with maximum rated output currents of 5 A
Two power supplies with maximum rated output currents of 5 A can be decoupled through a
SITOP PSE202U 10 A redundancy module (6EP1964-2BA00). To do this, outputs "+" of the
power supplies are connected to inputs "IN 24 V-1" and "IN 24 V-2 of the redundancy module,
output "OUT 24 V" of the redundancy module is connected to the load circuit.
Figure 9-1
SITOP expansion modules
Equipment Manual, 09.2022, A5E36605235-2-76
Redundancy of two power supplies with maximum rated output currents of 5 A
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