INSTRUCTION MANUAL
ZWS10C • 15C • 30C Series
TDK-Lambda
<Page>
6. Explanation of Functions and Precautions
6-1.
Input Voltage Range
Input voltage range is single phase 85-265VAC (47-63Hz).
Input voltage, which is out of specification, might lead unit damage.
For cases where conformance to various safeties required, described as 100-240VAC (50-60Hz).
6-2.
Inrush Current
This series equipped power thermistor to limit the inrush current. Higher inrush current will flow at higher ambient
temperature or re-input condition. Please select input switch and fuse carefully with the high temperature and re-input the
power condition. The Inrush Current value is under cold start at 25
o
C in the specification.
6-3.
Over Voltage Protection (OVP)
ZWS10C/ZWS15C : The over voltage protection (OVP) circuit with zener diode clamp system is built in. Over 115% of
nominal voltage will clamp the output. If the output voltage is lowered due to the over voltage application, the output will not
resume. Replacement of the power supply unit is necessary.
ZWS30C : The OVP function is output shut down method and manual reset type. Over 115% of nominal voltage will shut
down the output. If the output voltage is lowered due to the over voltage application, the output will not resume. To reset
OVP, remove the input of power supply for a few minutes, and then re-input.
In addition, the setting value of OVP is fixed and not adjustable. Pay attention not to apply higher voltage externally to the
output terminal to avoid unit failure. In case of inductive load, put protective diode in series to the output power line. In heavy
load condition, OCP may triggered before output reach OVP threshold.
6-4.
Over Current Protection (OCP)
Current limiting (Hiccup) with automatic recovery.
OCP function operates when the output current exceeds 105% of maximum DC output current of specification.
The outputs will be automatically recovered when the overload condition is removed. Never operate the unit under over
current or shorted conditions, which may lead unit damage. OCP setting is fixed and cannot be adjusted externally.
6-5.
Output Ripple & Noise
The standard specification for maximum ripple value is measured according to below measurement circuit .
When load lines are longer, ripple will becomes larger. In this case, electrolytic capacitor, film capacitor, etc. might be
necessary to use across the load terminal. The output ripple cannot be measured accurately if the probe ground lead of
oscilloscope is too long.
8/17
Coaxial Cable
+
Load
＋
－
150 mm
Oscilloscope
Power
Supply
Bandwidth : 100MHz
1.5m 50Ω
C1 : 0.1uF Cap., Film.
C2 : 100uF Cap., Elect.
C3 : 4700pF Cap., Ceramic.
R1 : 50Ω
C1
C2
C3
1
R
