-4-
TDK-Lambda
VS-E Series
Instruction Manual
4-8. Parallel Operation
For parallel operation, method (B) is possible.
Load
Output
Terminal
Output
Terminal
Load
Output
Terminal
Output
Terminal
(B) To use as Back-up Power Supply
1. Adjust the output voltage of each power supply to be the same.
2. Set power supply output voltage higher by the forward voltage
drop (Vf) of diode.
Use within the specification for output voltage and output power.
(A) To increase the output current is not possible.
Power Supply
Power Supply
4-9. Isolation Test
Isolation resistance between Output -
(Protective Earth) is more than 100M
Ω
at 500VDC. For safety operation, voltage setting of DC
isolation tester must be done before the test. Ensure that the unit is fully discharged after the test.
AC(L)
AC(N)
Isolation
Tester
+
‐
Output - (Protective Earth) : 500VDC More than 100M
Ω
4-10. Withstand Voltage
This series is designed to withstand 2.0kVAC between input and output, 2.0kVAC between input and
(Protective Earth) and 500VAC
between output and
(Protective Earth) each for 1 minute. When testing withstand voltage, set current limit of the withstand voltage test
equipment to 10mA (output -
(Protective Earth): 20mA). The applied voltage must be gradually increased from zero to the testing 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.
AC(L)
AC(N)
+
‐
AC(L)
AC(N)
+
‐
Withstand
Voltage Tester
Input - Output (Dashed line) : 2.0kVAC 1min ( 10mA)
Input - (Protective Earth) (Solid line) :
2.0kVAC 1min ( 10mA )
Output - (Protective Earth) : 500VAC 1min (20mA)
Withstand
Voltage Tester
Withstand
Voltage Tester
