10.10.3.8 Power Supply Parallel Operation
Power supplies are shipped from the factory with parallel operation enabled. Devices of the same type can be connected in
parallel to enable redundancy and to increase efficiency. If the output voltage is adjusted, all parallel operated power supply
units are automatically set to ensure uniform distribution of power. To ensure symmetrical current distribution, make sure all
cable connections from the power supply unit to the busbar bar are the same length and have the same cross-section.
Note Depending on the system, for parallel connection of more than two power supply units, a protective circuit should be
installed at each individual device output (such as decoupling diode, dc fuse, or power circuit breaker). This prevents high
return currents in the event of a secondary device fault.
For increased performance in parallel connected devices, the output current can be increased to N x IN. Parallel connection is
used to expand existing systems and increase efficiency. GE recommends that users use parallel connection if the power
supply unit does not cover the current requirement of the most powerful consumer. Otherwise, consumers should be spread
among individual devices independent of one another.
Note A maximum of five devices can be connected in parallel.
Parallel Connection for Increased Performance
418 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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