ML50.100, ML50.109
MiniLine
24V, 2.1A, S
INGLE
P
HASE
I
NPUT
Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
18/20
Please note:
This simple way to build a redundant system has two major disadvantages:
-
The faulty power supply can not be recognized. The green LED will still be on since it is reverse-powered from
the other power supply.
-
It does not cover failures such as an internal short circuit in the secondary side of the power supply. In such a
situation the defective unit becomes a load for the other power supplies and the output voltage can not be
maintained any more.
This above conditions can be avoided by utilizing decoupling diodes which are included in the decoupling module
MLY02.100.
Other recommendations for building redundant power systems:
a)
Use separate input fuses for each
power supply.
b)
Monitor the individual power supply units. A DC-ok output is included in the ML50.100, ML50.101 and
ML50.111. In all other cases, use the redundancy module YRM2.DIODE which has a monitoring circuit for each
input included.
c)
When possible, connect each power supply to different phases of the mains network.
27.6. D
AISY
C
HAINING OF
O
UTPUTS
Daisy chaining (jumping from one power supply output to the next) is allowed as long as the maximum current
through one terminal pin does not exceed 13A. If the current is higher, use a separate distribution terminal block.
Fig. 27-5
Daisy chaining of outputs
Fig. 27-6
Using distribution terminals
Power
Supply
+ +
- -
Input
Output
Load
+
-
max 13A!
Power
Supply
+ +
- -
Input
Output
Load
+
-
Distribution
Terminals
Power
Supply
+ +
- -
Input
Output
Power
Supply
+ +
- -
Input
Output
27.7. C
HARGING OF
B
ATTERIES
The power supply can be used for float-charging of lead-acid or maintenance free 24V VRLA batteries.
Instructions for charging batteries:
a)
Ensure that the ambient temperature of the power supply does not exceed 50°C.
b)
Set the output voltage on a disconnected load, very precisely to the end-of-charge voltage according to the
expected battery temperature.
End-of-charge voltage
27.8V
27.5V
27.15V
26.8V
Battery
temperature
10°C 20°C 30°C 40°C
c)
Use a 4A or 6A circuit breaker (or blocking diode ) between the power supply and the battery.
d)
Ensure that the output current of the power supply is below the allowed charging current of the battery.
e)
Use only matched batteries when putting 12V types in series.
f)
The return current to the power supply is typ. 10.7mA at 25Vdc
when the power supply is switched off (except in
case a blocking diode is utilized).
