4 Input Voltage/Current Range
¡
If you use a non-regulated power source for input, please check
and make sure that its voltage fluctuation range and ripple voltage
do not exceed the input voltage range shown in specifications.
¡
Please select an input power source with enough capacity, taking
into consideration of the start-up current (Ip), which flows when a
DC-DC converter starts up.
Ip
Input
Current
[A
]
Input Voltage [V]
Input Voltage Range
Fig.4.1 Input Current Characteristics
5 Cleaning
¡
If you need to clean the unit, please clean it under the following
conditions.
Cleaning Method: lmmersion, Ultrasonic or Vapor Cleaning
Cleaning agent: IPA (Solvent type)
Cleaning Time: Within total 2 minutes for lmmersion, ultrasonic
and vapor cleaning
¡
Please dry the unit sufficiently after cleaning.
¡
If you do ultrasonic cleaning, please keep the ultrasonic output at
15W/ or below.
6 Safety Standards
¡
To apply for a safety standard approval using the power supply,
please meet the following conditions. Please contact us for details.
¿
Please use the unit as a component of an end device.
¿
Reinforced insulation (250 VAC or less) is provided between the
input and output of this power supply. Limited to use when the in-
put voltage of the device is 250 VAC or less.
¿
Safety approved fuse must be externally installed on input side.
¿
MH series has 2MOOP medical isolation grade.
¡
If the distance between the output and the load is long and there-
fore noise is created on the load side, connect a capacitor exter-
nally to the load as shown below.
Load
Input
+Vin
-Vin
+Vout
-Vout
Fig2.4 Connecting Example
3 Series/Redundancy
Operation
3.1 Series Operation
¡
Series operation is available by connecting the outputs of two or
more power supplies, as shown below. Output current in series
connection should be lower than the lowest rated current in each
unit.
Power
Supply
Power
Supply
+
-
-
+
Load
Power
Supply
Power
Supply
+
-
-
+
Lo
ad
Lo
ad
(a)
(b)
Fig.3.1 Examples of series operation
3.2 Redundancy Operation
¡
Parallel operation is not possible.
¡
Redundancy operation is available by wiring as shown below.
Power
Supply
Power
Supply
I
2
I
1
I
3
-
+
+
-
Lo
ad
Fig.3.2 Redundancy operation
¡
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 for each power supply.
I
3
[
Rated Current Value
DC-DC Converters PCB Mount Type
MH3
Instruction Manual
MH-11
June 26, 2020
