106980 datasheet(24/25 Pages) PHOENIX

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Operating modes

18.1

Series operation

Two power supplies can be switched in series, to double the

output voltage. For connection in series, only power

supplies of the same performance class should be used. An

output voltage of, for example, 24 V DC can be provided, if

two 12 V power supplies are connected in series.

Various voltage levels are made possible by varying the

switching of the respective output voltage and the

measurement reference point.

Figure 22

Wiring principle, voltage levels with two power

supplies

18.2

Parallel operation

Devices of the same type can be connected in parallel to

increase both redundancy and power. By default upon

delivery, no further adjustments are required.

If the output voltage is adjusted, a uniform distribution of

power is guaranteed by setting all parallel operated power

supply units to exactly the same output voltage.

To ensure symmetrical current distribution we recommend

that all cable connections from the power supply unit to the

busbar are the same length and have the same cross

section.

Depending on the system, for parallel connection of more

than two power supplies a protective circuit should be

installed at each individual device output (e.g., decoupling

diode, DC fuse or circuit breaker). This prevents high return

currents in the event of a secondary device fault.

Figure 23

Schematic diagram in parallel operation

18.3

Redundant operation

Redundant circuits are suitable for supplying systems which

place particularly high demands on operational reliability. If

a fault occurs in the primary circuit of the first power supply,

the second device automatically takes over the complete

power supply without interruption, and vice versa. To this

end, the power supplies to be connected in parallel are

dimensioned so that the total current requirements of all

loads can be fully met by a single power supply. External

decoupling diodes are required for 100% redundancy.

18.3.1 Decoupling with diode module

Figure 24

Schematic diagram, decoupling with diode

module

-24 V

+12 V

-12 V

+24 V

Σ =I

–

+–

Σ =I

–

+–

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