ZU/ZT-46

ZU/ZT

ZT1R5 ZT3

2.2 Overcurrent protection

n

n

Overcurrent protection circuit is built-in and comes into effect at

over 105% of the rated current.

Overcurrent protection prevents the unit from short circuit and

over current condition of less than 20 sec. The unit automatically

recovers when the fault condition is cleared.

The power supply which has a current foldback characteristics

may not start up when connected to nonlinear load such as lamp,

motor or constant current load. See the characteristics below.

Fig.2.1 Current foldback characteristics

Note: In case of nonlinear load, the output is locked out at A point.

: Load characteristics of power supply

: Characteristics of load (lamp, motor, constant current load, etc.)

2.3 Isolation

nFor 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.

3 Wiring to Input/

Output Pin

n

n

Input filter is built-in. A capacitor Ci, if installed near the input ter-

minal, 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 Ci to the input terminal.

””

Fig.3.1 Connecting method of capacitor at input terminal

Capacity of external capacitor at input terminal: Ci [µF]

Model

ZTS1R5

ZTW1R5

100

47

33

10

ZTS3

ZTW3

220

100

47

22

5

12

24

48

Input voltage(V)

nTo lower the output ripple voltage further, install an external ca-

pacitor Co at output terminal as shown below.

ZTS

ZTW

Fig.3.2 Connecting method of external capacitor at output terminal

Capacity of external capacitor at output terminal: Co [µF]

Model

ZTS1R5

ZTW1R5

100

100

100

ZTS3

ZTW3

220

100

100

5

12

15

Output voltage(V)

nWhen the distance between load and DC output is long, please in-

stall capacitor at load as shown below.

Fig.3.3 Connection method of capacitor at load

+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

Instruction

anual

M

DC-DC Converters PCB Mount type

October 08, 2013