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Single-Phase Primary-Switched Power Supply Unit for Universal Use – QUINT 48 V DC/20 A
7.3. Parallel Operation
Devices of the same type can be connected in
parallel to increase both redundancy and power. The
default setting does not have to be adjusted.
If the output voltage is adjusted, an even current
QUINT
20 A
+ –
QUINT
20 A
+ –
distribution can be ensured by precisely setting all
power supply units that are operated in parallel to the
same output voltage.
To ensure symmetrical current distribution we
recommend that all cable connections from the power
supply unit to the DIN rail are the same length and have
+
–
the same cross section.
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
(e.g., decoupling diode or DC fuse). This prevents high
return currents in the event of a secondary device fault.
7.4. Redundancy Operation (Figure 17)
Redundant connections are designed for supplying
+ –
Σ = 20 A
Figure 17
systems, which place particularly high requirements on
operational safety. If a fault occurs in the primary circuit
QUINT
20 A
+ –
QUINT
20 A
+ –
of the ? rst 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 must be large enough that the
+
–
total current requirements of all loads can be fully met
by one power supply unit.
+ –
Σ = 40 A
External decoupling diodes are required for 100%
redundancy.
Figure 18
7.5. Power Increase (Figure 18)
The output current can be increased to n x I N where
n is the number of devices connected in parallel.
Parallel connection for increasing power is used
when extending existing systems. A parallel
connection is recommended if the power supply unit
does not cover the current consumption of the most
powerful load. Otherwise, the loads should be divided
over independent individual devices.
A maximum of ? ve devices can be connected in
parallel.
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