Applications
9.2 Parallel connection for redundancy
SITOP modular 1ph/2ph
Operating Instructions, 06.2014, C98130-A7548-A1-3-7629
59
9.2
Parallel connection for redundancy
Connecting several SITOP modular power supplies in parallel for redundancy purposes is
required if especially high demands are placed regarding the availability of a reliable 24 V
power supply.
Using the SITOP PSE202U redundancy module, two 24 V power supplies of the same type
up to 20 A can be decoupled (Figure 9-2 Redundant configuration with two power supplies
and SITOP PSE202U redundancy module (Page 59)). When one of the devices fails, then
the other automatically takes over the power supply. If one of the power supplies fails, then
this is signaled using an LED on the redundancy module as well as an isolated relay contact.
For higher output currents, a redundancy module must be connected to each power supply
(Figure 9-3 Redundant configuration with two power supplies and two SITOP PSE202U
redundancy modules (Page 60)).
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, connected to different
power supply networks.
Figure 9-2
Redundant configuration with two power supplies and SITOP PSE202U redundancy
module
