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

12

3

3

ZU/ZT-42

Fig.3.3 Connection method of capacitor at load

4 Series Operation and

Parallel Operation

4.1 Series operation

nSeries 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

nWhen 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)

nTo 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

October 08, 2013