S8VK-WA/S8VK-WB
27
S8VK-W
A
S8VK-WB
Common Accessories
Common Precautions
Peak current
The boost current is a temporary current that exceeds the rated
current.
However, it should meet the following four boost current conditions.
• Time that the boost current flows: t1
≤
10 s
• The boost current: Ip
≤
Maximum boost current
• The average output current: Iave
≤
Rated output current
• The time ratio of the boost current flow: Duty
≤
30%
• Do not allow the peak current to continue for more than 10
seconds. Do not allow the duty to exceed 30%. The Power Supply
may be damaged.
• Ensure that the average current of one cycle of the boost current does
not exceed the specified value. The product may be damaged.
• Derate the load at the boost current and average output current
according to the ambient operating temperature and mounting.
Charging a Battery
If you connect a battery as the load, install overcurrent control and
overvoltage protection circuits.
Output voltage adjuster (V.ADJ)
• The output voltage adjuster (V.ADJ.) may possibly become
damaged. Do not apply more than the required force.
• After completing output voltage adjustment, be sure that the output
power or output current does not exceed the rated output electric
power or rated output current.
Series Operation
Two Power Supplies can be connected in series.
Note: 1.
If the load is short-circuited, a reverse voltage will be
generated inside the Power Supply. If this occurs the
product may possibly deteriorate or be damaged. Always
connect a diode as shown in the figure. Select diodes with
the following ratings.
2.
Though Power Supplies having different specifications can
be connected in series, the current flowing through the load
must not exceed the smaller rated output current.
Be sure to check that the Iout > 100% indicator is not lit or
the Iout > 100% signal output is turned OFF before using.
<Making Positive/Negative Outputs>
• The outputs are floating outputs (i.e., the primary circuits and
secondary circuits are separated). You can therefore make
positive and negative outputs by using two Power Supplies. You
can make positive/negative outputs with any of the models.
If positive and negative outputs are used, connect Power Supplies
of the same model as in the following figure. (Combinations with
different output capacities or output voltages can be made.
However, use the lower of the two maximum rated output currents
as the current to the loads.)
• Depending on the model, internal circuits may be damaged due to
startup failure when the power is turned ON if loads such as a
servomotor or operational amplifier may operate in series.
Therefore, connect bypass diodes (D
1
, D
2
) as shown in the
following figure.
• Use the following information as a guide to the diode type, dialectic
strength, and current.
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
Duty =
t1 + t2
t1
× 100 [%]
≤
30%
Ip:
Boost current
Rated current
lave: Average current
t2
t1
Output current
[A]
+V
-V
+V
-V
L1/+
L2
L3/-
L1
L2
L3
L1/+
L2
L3/-
Load
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
+V
-V
+V
0 V
-V
L1
L2
L3
L1/+
L2
L3/-
L1/+
L2
L3/-
Load
Load
+V
-V
+V
-V
L1
L2
L3
L1/+
L2
L3/-
L1/+
L2
L3/-
D
2
D
1
Load
Load
Load
