4.2 Redundancy operation
n
n
n
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 and I .
Please make sure that the value of I does not exceed the rated
current of a power supply.
I
the rated current value
1
2
3
3
ZU/ZT-42
Fig.3.3 Connection method of capacitor at load
4 Series Operation and
Parallel Operation
4.1 Series operation
n
Series operation is available by connecting the outputs of two or
more power supplies, as shown below.
Output currents in series connection should be lower than the low-
est rated current in each unit.
(a)
(b)
ZU15 ZU25
n
When the distance between load and DC output is long, please in-
stall capacitor at load as below.
ZU/ZT
+VIN
-VIN
DC IN
+VIN
-VIN
DC IN
(a)
(b)
Reverse input voltage protection
Avoid the reverse polarity input voltage. It will damage the power
supply.
It is possible to protect the unit from the reverse input voltage by
installing an external diode as shown in Fig.3.4.
Fig.3.4 Reverse input voltage protection
n
n
n
The input filter is built-in. A capacitor (Ci),if installed near the input
terminal, will lower the input conducted noise from converter due
to the formation of the
type filter.
When the distance from the DC line to the unit is greatly ex-
tended, it makes the input feedback noise much higher and the in-
put voltage several times higher than the normal level when
turned ON. If this happens, the output power also becomes un-
stable. In order to prevent the unit form failing in this way; please
connect Ci to the input terminal. In addition, when the filter with
L is used, please connect Ci to the input terminal.
” ”
3 Wiring to Input/
Output Pin
Fig.3.2 Connecting method of external capacitor at output terminal
Capacity of external capacitor at output terminal: Co [µF]
Model
ZUS15
ZUW15
ZUS25
ZUW25
330
150
68
33
470
220
100
47
3, 5
12
24
48
Input voltage (V)
n
To decrease the ripple voltage further, install an external capacitor
Co at output terminal as shown below.
ZUS
ZUW
Model
ZUS15
ZUW15
ZUS25
ZUW25
220
100
100
220
100
100
3, 5
12
15
Output voltage(V)
Fig.3.1 Connection method of capacitor at input terminal
Capacity of external capacitor at input terminal: Ci [µF]
Instruction
anual
M
DC-DC Converters PCB Mount type
