1.1 Input voltage range
¡
The range is from AC85V to AC132V.
¡A
C input voltage must have a range from AC85V to AC132V for
normal operation. If the wrong input is applied, the unit will not op-
erate properly and/or may be damaged.
¡
In cases that conform with safety standard, input voltage range is
AC100-AC120V(50/60Hz).
1.2 Inrush current limiting
¡
Inrush current limiting is built-in.
¡
If a switch is being used for input, ensure that it is confi gured to
handle the input inrush current.
¿
LGA50A, LGA75A
¡
If the unit is shut down, recycling AC line has to be done after
cooling down the unit since thermistor is used for the protection
from the inrush current.
¿
LGA100A, LGA150A, LGA240A
¡
The SCR is used for protection from inrush current. When power
is turned ON/OFF repeatedly within a short period of time, it is
necessary to have enough time between power ON and OFF to
operate resistance circuit for inrush current.
1.3 Overcurrent protection
¡
Overcurrent protection is built-in and comes into effect at over
105%(-H is 101% or more of the peak current) of the rated cur-
rent. Overcurrent protection prevents the unit from short circuit
and overcurrent condition of less than 15 seconds. The unit auto-
matically recovers when the fault condition is cleared.
¿
LGA50A-3R3-Y, LGA50A-5, LGA75A-3R3-Y,
LGA75A-5, LGA100A-3R3-Y, LGA100A-5-Y,
LGA150A-3R3-Y, LGA150A-5-Y
¡
Intermittent current characteristics.
¡
When the output voltage drops at overcurrent, the average output
current is reduced by intermittent operation of power supply.
1.4 Overvoltage protection
¡
An overvoltage protection circuit is built-in. The AC input should
be shut down if overvoltage protection is in operation. The mini-
mum interval of AC recycling for recovery is 1.5 minutes (LGA240A
is 3minutes).
*
The recovery time varies depending on input voltage.
¡
Series operation is available by connecting the outputs of two or
more power supplies with the same output voltage, as shown be-
low. Output current in series connection should be lower than the
lowest rated current in each unit.
¡
Parallel operation is not possible.
¡
Redundancy operation is available by wiring as shown below.
¡
Even a slight difference in output voltage can affect the balance
between the values of I
1
and I
2
.
Please make sure that the value of I
3
does not exceed the rated
current of a power supply.
I
3
[
the rated current value
1 Function
Remarks:
Please avoid applying the over-rated voltage to the output termi-
nal. Power supply may operate incorrectly or fail.In case of oper-
ating a motor etc. , please install an external diode on the output
terminal to protect the unit.
1.5 Output voltage adjustment range
¡
Adjustment of output voltage is possible by using potentiometer.
Please refer to instruction manual 5.1.
¡
Option ”-Y” is recommended which can adjust the output voltatge.
1.6 Isolation
¡
For a receiving inspection, such as Hi-Pot test, gradually increase
(decrease) the voltage for the start (shut down). Avoid using Hi-
Pot tester with the timer because it may generate voltage a few
times higher than the applied voltage, at ON/OFF of a timer.
2
Series Operation and
Parallel Operation
AC-DC Power Supplies Open Frame/ Enclosed Type
Instruction Manual
LGA-14
LGA
I
2
I
1
I
3
-
+
+
-
Load
Power
Supply
Power
Supply
Load
(a)
(b)
Load
Load
Power
Supply
+
-
Power
Supply
+
-
Power
Supply
+
-
+
-
Power
Supply
Fig.2.1 Examples of connecting in series operation
Fig.2.2 Example of redundancy operation
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2015/06/19 14:42:25
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