Datasheet

CT10.481
C-Series
48V, 5A, THREE PHASE INPUT
23.7. INDUCTIVE AND CAPACITIVE LOADS
The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.
23.8. PARALLEL USE TO INCREASE OUTPUT POWER
CT10.481 power supplies can be paralleled to increase the output power.
This power supply can also be paralleled with power supplies of the same
type. The output voltage of all power supplies shall be adjusted to the same
value (±100mV) in “Single use” mode with the same load conditions on all
units, or the units can be left with the factory settings. After the
adjustments, the jumper on the front of the unit shall be moved from
“Single use” to “Parallel use”, in order to achieve load sharing. The “Parallel
use” mode regulates the output voltage in such a manner that the voltage
at no load is approx. 5% higher than at nominal load. See also chapter 6. If
no jumper is plugged in, the unit is in “Single use”. Factory setting is “Single
use” mode. A fuse (or diode) on the output of each unit is only required if more than three units are connected in
parallel. If a fuse (or circuit breaker) is used, choose one with approximately 150% of the rated output current of the
power supply. 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 the bottom and output terminals on 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.
Unit B
-
+
Load
+
-
Fuse
Fuse
AC
DC
AC
DC
-
+
Unit A
23.9. 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 5A are paralleled to build a 20A
redundant system. For N+1 redundancy the same restrictions apply as for increasing the output power, see also section
23.8.
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 defect unit becomes a load for the other power supplies
and the output voltage can not be maintained any more. This can only be avoided by utilizing decoupling diodes
which are included in the decoupling module YRM2.DIODE.
Recommendations for building redundant power systems:
a) Use separate input fuses for each power supply.
b) Set the power supply into “Parallel Use”.
c) Monitor the individual power supply units. A DC-ok lamp and a DC-ok contact is included in the redundancy
module YRM2.DIODE. This feature reports a faulty unit.
d) It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.
Jan. 2010 / Rev. 1.1 DS-CT10.481-EN
All parameters are specified at 48V, 5A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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20/22