1+1 Redundancy

It is possible to connect power supplies in parallel for redundancy operation in order to achieve better system availability. Redundant systems provide a certain amount of additional power to operate the load when a power supply unit fails. The simplest method is to connect two power supplies in parallel. This is called 1+1 redundancy. If one power supply fails, the other can automatically supply the load current without interruption.

The 1+1 redundancy allows ambient temperatures up to +70°C.

1+1 Redundancy 1:

Notes on parallel use for 1+1 redundancy

  • Be sure to use a redundancy module in order to decouple devices from one another. This prevents the defective device from becoming a load for the other device and the output voltage no longer being maintainable.
  • Note that leakage current, EMI, input inrush current and harmonics increase when using multiple devices.

Wiring example:

1+1 Redundancy 2:
Wiring for 1+1 redundancy with one redundancy module PS9421-4840-0000