S8VK-S
22
Backup Operation
Backup operation is possible if you use two Power Supplies of the
same model.
Even if one Power Supplies fails, operation can be continued with the
other Power Supply.
Make sure that the maximum load does not exceed the capacity of
one Power Supply.
Use the S8VK-R or connect external diodes. For backup operation
with 30, 60 and 120-W power supplies, use the S8VK-R10 model. For
backup operation with 240-W power supplies, use the S8VK-R20
model.
• Use the following information as a guide to the diode type,
dielectric strength, and current.
In Case There Is No Output Voltage
The possible cause for no output voltage may be that the overcurrent
or overvoltage protection has operated. The internal protection may
operate if a large amount of surge voltage such as a lightening surge
occurs while turning ON the power supply.
In case there is no output voltage, please check the following points
before contacting us:
• Checking overload protected status:
Check whether the load is in overload status or is short-circuited.
Remove wires to load when checking.
• Checking overvoltage or internal protection:
Turn the power supply OFF once, and leave it OFF for at least
3 minutes. Then turn it ON again to see if this clears the condition.
Audible Noise at Power ON
<S8VK-S12024, S8VK-S24024, and S8VK-S48024>
A harmonic current suppression circuit is built into the Power Supply.
This circuit can create noise when the input is turned ON, but it will
last only until the internal circuits stabilize and does not indicate any
problem in the Product.
Type
Schottky Barrier diode
Dielectric strength (V
RRM
) Twice the output voltage or above
Forward current (I
F
)
Twice the rated output current or above
+V
−
V
INPUT
S8VK-S
S8VK-R
S8VK-S
INPUT
IN 1
IN 2
Load
+V
−
V
+V
−
V
+V
−
V
+V
−
V
INPUT
INPUT
S8VK-S
S8VK-S
Load
