QS20.241 Datasheet, PDF (24/26 Pages) PULS GmbH – 24V, 20A, SINGLE PHASE INPUT

Q-Series
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
22.7. PARALLEL USE TO INCREASE OUTPUT POWER
Unit A
Power supplies from the same series (Q-Series) can be paralleled to increase
the output power. The output voltage shall be adjusted to the same value
(±100mV) with the same load conditions on all units, or the units can be left
with the factory settings.
AC
+
-
DC
+
If more than three units are connected in parallel, a fuse or circuit breaker
with a rating of 30A or 32A is required on each output. Alternatively, a diode
or redundancy module can also be utilized.
Keep an installation clearance of 15mm (left / right) between two power
supplies and avoid installing the power supplies on top of each other. Do not
Unit B
AC
+
-
DC
Load
-
use power supplies in parallel in mounting orientations other than the standard mounting orientation (input terminals
on bottom and output terminals on the top of the unit) or in any other condition where a derating of the output
current is required (e.g. altitude, above 60°C, …).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
22.8. PARALLEL USE FOR REDUNDANCY
Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a
certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is
automatically able to support the load current without any interruption.
Redundant systems for a higher power demand are usually built in a
N+1 method. E.g. five power supplies, each rated for 20A are paralleled
24V
20A
Load
Failure
Monitor
to build a 80A redundant system. For N+1 redundancy the same
restrictions apply as for increasing the output power, see also section
22.7.
Please note: This simple way to build a redundant system does not
cover failures such as an internal short circuit in the secondary side of
the power supply. In such a case, the defective unit becomes a load for
the other power supplies and the output voltage can not be maintained
any more. This can be avoided by utilizing decoupling diodes or Mosfets,
which are included in the redundancy module YR40.241 or YR40.242.
++ --
24V,20A
DC-
OK
QS20.241
Power
Supply
L N PE
+-
Output
YR40.242^*)
Redundancy
Module
Input Input
1
2
+- +-
++ --
24V,20A
DC-
OK
QS20.241
Power
Supply
L N PE
Recommendations for building redundant power systems:
a) Use separate input fuses for each power supply.
b) Monitor the individual power supply units. Therefore, use the DC-
OK relay contact of the QS20 power supply.
c) It is desirable to set the output voltages of all units to the same
value (± 100mV) or leave it at the factory setting.
I
L
N
PE
*) _YR40.241
also possible
I
Oct. 2013 / Rev. 2.2 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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