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Useful Information from Everyday Practice
3.1.2
Parallel Connection for Designing Redundant Circuits
Fields of Application
Increasing system
availability
Redundant circuits are intended to supply systems, which have a high demand concerning
operational reliability. If a fault occurs in the primary circuit of the first power supply unit,
the second device automatically takes over the complete power supply without
interruption, and vice versa.
For this purpose, the power supply units to be connected in parallel are designed large
enough to enable the power supply of all loads using only one power supply unit.
Method of Operation
Two suitably designed power supply units from Phoenix Contact with identical functions
are connected in parallel for simple redundancy. N-fold redundancy can be achieved by
connecting n+1 devices in parallel (without additional power share cable).
No additional measures are required in redundancy operation as all one-phase power
supply units of Phoenix Contact are internally protected in the primary circuit.
5598_en_03
PHOENIX CONTACT
3-7
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