1 Function
1.1 Input voltage range
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The range is from 85VAC to 264VAC.
In cases that conform with safety standard, input voltage range is
100VAC to 240VAC (50/60Hz).
When DC input is required, Please contact us.
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If input value doesn’t fall within above range, a unit may not oper-
ate in accordance with specifications and/or start hunting or fail.
If you need to apply a square waveform input voltage, which is
commonly used in UPS and inverters, please contact us.
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When the input voltage changes suddenly, the output voltage ac-
curacy might exceed the specification. Please contact us.
If the restart time of the
short interruption power failure is less than
3 seconds, perform a thorough evaluation.
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A unit can operate under the input voltage dip with derating.
Table 1.1 shows the load factors that can be output.
Table 1.1 Load factor
Model
Input Voltage
100VAC→50VAC
*
200VAC→100VAC
LHA10F
60%
100%
LHA15F
60%
100%
LHA30F
50%
100%
LHA50F
50%
100%
LHA75F
-
100%
LHA100F
-
100%
LHA150F
-
100%
LHA300F
-
100%
*
Please avoid using continuously for more than 1 second under
above conditions. Doing so may cause a failure (Duty 1s/30s).
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LHA10F, LHA15F, LHA30F, LHA50F
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A power factor improvement circuit (active filter) is not built-in. If
you use multiple units for a single system, standards for input har-
monic current may not be satisfied. Please contact us for details.
1.2 Inrush current limiting
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LHA10F
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Resistance for line filter is used for inrush current limiting.
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LHA15F, LHA30F, LHA50F, LHA75F,
LHA100F, LHA150F, LHA300F
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An inrush current limiting circuit is built-in.
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If you need to use a switch on the input side, please select one
that can withstand an input inrush current.
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Thermistor is used in the inrush current limiting circuit. When you
turn the power ON/OFF repeatedly within a short period of time,
please have enough intervals so that a power supply cools down
before being turned on.
1.3 Overcurrent protection
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An overcurrent protection circuit is built-in and activated over
105% of the rated current. A unit automatically recovers when a
fault condition is removed.
Please do not use a unit in short circuit and/or under an overcur-
rent condition.
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Hiccup Operation Mode
When the output voltage drops at overcurrent, the average output
current is reduced by hiccup operation of power supply.
Please contact us for details.
1.4 Overvoltage protection
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An overvoltage protection circuit is built-in. If the overvoltage pro-
tection circuit is activated, shut down the input voltage, wait more
than 3 minutes and turn on the AC input again to recover the out-
put voltage. Recovery time varies depending on such factors as
input voltage value at the time of the operation.
Remarks :
Please avoid applying a voltage exceeding the rated voltage to an
output terminal. Doing so may cause a power supply to malfunc-
tion or fail. If you cannot avoid doing so, for example, if you need
to operate a motor, etc., please install an external diode on the
output terminal to protect the unit.
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LHA150F, LHA300F
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In option -R2, overvoltage protection is deactivated by toggling ON/
OFF signal of remote control.
1.5 Output voltage adjustment range
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Adjustment of output voltage is possible by using option “-Y”.
Please refer to instruction manual 6.1.
AC-DC Power Supplies Open Frame
Instruction Manual
LHA-25
May 26, 2022
