3
NEMIC-LAMBDA
SWS
50
⋅
75
⋅
100
⋅
150
Series
INSTRUCTION MANUAL
(B) Operation as a Backup Power Supply is possible as fol-
lows.
1.
Set the power supply output voltage higher by the
amount of forward voltage drop ( Vf ) of the diode.
2.
Please adjust the output voltage of each power supply
to be the same.
3.
Please use within the specifications for output voltage
and output current.
Output
Terminal
Output
Terminal
Load
Power
Supply
4. Isolation / Withstand Voltage
4-1. Isolation Test
Isolation resistance between output and FG ( chasis ) shall
be more than 100M
Ω
at 500VDC. For safety, 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)
AC(L)
AC(N)
FG
+
+
-
-
Isolation
Tester
500VDC,
100M
Ω
or more
4-2. Withstand Voltage
This series is designed to withstand 3.0kVAC between input
and output, 2.0kVAC between input and FG ( chassis ) and
500VAC between output and FG ( chassis ) each for 1 min-
ute. When testing withstand voltage, set current limit of
withstand voltage test equipment at 20mA ( Output-FG
( chassis ) : 100mA ). The applied voltage must be gradually
increased from zero to testing value and then gradually de-
creased 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.
Input ~ FG( chassis ) : solid line
2kVAC, 1min ( 20mA )
Input ~ Output : dotted line
3kVAC, 1min ( 20mA )
AC(L)
AC(N)
FG
+
+
-
-
Withstand
Voltage
Tester
Output ~ FG ( chassis )
500VAC, 1min ( 100mA )
AC(L)
AC(N)
FG
+
+
-
-
Withstand
Voltage
Tester
5. Mounting Directions
5-1. Output Derating according to the Mounting
Directions
Recommend standard mounting is method ( A ).
Method ( B ) ( C ) and ( D ) are also possible. Refer to
the derating below. Please do not use installation
method ( E ), where the PCB will be on the topside and
heat will be trapped inside the unit. In the following
derating curve, the maximum output current is consid-
ered to be 100%.
