ML30.241
MiniLine-2
24V,
1.3A,
S
INGLE
P
HASE
I
NPUT
22.6.
P
ARALLEL
U
SE FOR
R
EDUNDANCY
20/23
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 an N+1 method.
E.g. five power supplies, each rated for 1.3A are paralleled to build a 5A
redundant system.
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 redundancy module
MLY10.241.
MLY10
IN 1
+
-
+
-
L
N
I
I
ML30.241
L N
Output
Input
+ +
-
ML30.241
L N
Output
Input
+ +
-
Output
Load
+
- -
+
-
IN 2
Voltage
Monitor
Recommendations for building redundant power systems:
a)
Use separate input fuses for each
power supply.
b)
Use separate mains systems for each power supply whenever it is possible.
c)
Monitor the individual power supply units.
d)
1+1 Redundancy is allowed up to an ambient temperature of 60°C.
N+1 Redundancy is allowed up to an ambient temperature of 45°C.
e)
It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.
22.7.
I
NDUCTIVE AND
C
APACITIVE
L
OADS
The unit is designed to supply any type of load, including unlimited capacitive and inductive loads.
22.8.
S
ERIES
O
PERATION
Power supplies of the exact same type can be connected in series for higher
output voltages. It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed 150Vdc. Voltages
with a potential above 60Vdc are not SELV any more and can be dangerous.
Such voltages must be installed with a protection against touching. Earthing of
the output is required when the sum of the output voltage is above 60Vdc.
Avoid return voltage (e.g. from a decelerating motor or battery) which is
applied to the output terminals. 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 series in mounting
orientations other than the standard mounting orientation (input terminals on the bottom and output terminals on
top of the unit). Be ware that leakage current, EMI, inrush current and harmonics will increase when using multiple
power supplies series.
Earth
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
Mar. 2013 / Rev. 1.2 DS-ML30.241-EN
All parameters are specified at 24V, 1.3A, 230Vac input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
