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3-7. Over Current Protection ( OCP )
Constant current limiting, automatic recovery. OCP func-
tion operates when the output current exceeds 105% of
maximum output current on specification. The output will
be automatically recovered when the overload condition
is canceled. Never operate the unit under over current or
shorted conditions over 30 seconds which could result in
damage or insulation failure.
3-8. Output Ripple & Noise
The standard specification for maximum ripple value is
measured according to measurement circuit specified by
EIAJ-RC9131. When load lines are longer, ripple will be-
comes larger. In this case, electrolytic capacitor, film ca-
pacitor, etc. might be necessary to use across the load
terminal. The output ripple cannot be measure accurately
if the probe ground lead of oscilloscope is too long.
+
Power
Supply
-
Coaxial Cable
1.5m 50Ω
R:50Ω
C:4700pF
3-9. Remote ON/OFF Control
( Optional Spec. )
Remote ON/OFF control function is available as option
with model name followed by /R. Using this function al-
lows the user to turn the all outputs on and off without
having to turn the AC input on and off. It is controlled by
the voltage applied to +R and -R. This circuit is in the
Secondary ( output ) side of the power supply unit. Do not
connect in the Primary ( input ) side. And this circuit is
isolated from the output by a photocoupler.
Power
Supply
1kW
Load
Oscillo-
R
scope
C
100MHz
SW
+R
R
E
-R
The control mode is shown below.
+ R & - R terminal condition
SW ON ( Higher than 4.5V )
SW OFF ( Lower than 0.8V )
External voltage level : E
4.5~12.5VDC
12.5~24.5VDC
4. Isolation Test / Withstand Voltage
4-1 Isolation Test
Isolation resistance between output and FG ( chassis )
shall be more than 100MW at 500VDC. For safety opera-
tion, voltage setting of DC isolation tester must be done
before the test. Ensure that the it is fully discharged after
the test.
Output ~ FG ( chassis )
4-2. Withstand Voltage
This series is designed to withstand 3.0kVAC between
input and output, 2.0kVAC between input and FG ( chas-
sis ) and 500VAC between output and the FG ( chassis )
each for 1 minute. When testing withstand voltage, set
current limit of the withstand voltage test equipment to
20mA ( Output - FG ( chassis ) : 100mA ). The applied
voltage must be gradually increased from zero to the test-
ing value and then gradually decreased for shut down.
When timer is used, the power supply may be damaged by
high impulse voltage at timer switch on and off. Connect
input and output as follows.
3
TDK-Lambda
JWT Series
INSTRUCTION MANUAL
Output Condition
ON
OFF
External resistance : R
No required
1.5kW
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