Datasheet

QS10.121
Q-Series
12V, 15A, SINGLE PHASE INPUT
22.7. PARALLEL USE TO INCREASE OUTPUT POWER
23/26
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.
If more than three units are connected in parallel, a fuse or circuit breaker
with a rating of 20A or 25A 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
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, …).
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
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 15A are paralleled to build a 60A
redundant system. For N+1 redundancy the same
restrictions apply as for increasing the output power, see
also section 22.7.
L N PE
+ +
- -
QS10.121
Power
Supply
Adj
Overload
DCok
12V,15A
Failure
Monitor
12V,15A
Load
optional
I I
L
N
PE
L N PE
+ +
- -
QS10.121
Power
Supply
Adj
Overload
DCok
12V,15A
YR2.Diode
Redundancy
Module
+ -
OUT
+ -
IN 1
+ -
IN 2
YR2.Diode
Redundancy
Module
+ -
OUT
+ -
IN 1
+ -
IN 2
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 which
are included in the redundancy module YR2.DIODE.
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 QS10 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.
Dec. 2014 / Rev. 2.4 DS-QS10.121-EN
All parameters are specified at 12V, 15A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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