S8VK-S
21
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 be damaged if it
is turned with unnecessary force. Do not turn the adjuster with
excessive 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.
The diode is connected as shown in the figure. If the load is
short-circuited, a reverse voltage will be generated inside
the product. If this occurs the product may possibly
deteriorate or be damaged. Always connect a diode as
shown in the figure.
Select a diode having the following ratings.
2.
Although Products having different specifications can be
connected in series, the current flowing through the load
must not exceed the smaller rated output current.
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 and 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 (D1, D2) as shown in the
following figure.
• Use the following information as a guide to the diode type,
dielectric strength, and current.
Parallel Operation
Parallel operation is used when the output current from one Power
Supply is insufficient for the load. Power Supplies are connected in
parallel to increase the output current.
Two Power Supplies can be connected in parallel.
• You must meet the following conditions to use parallel operation.
• Standard mounting.
• The range of ambient temperature is -25 to 40°C.
Left and right interval 15 mm or more, Up and down interval
25 mm min. (30, 60, 120W), Up and down interval 23 mm min.
(240, 480 W).
• Rated input voltage range and output voltage of 25 V max.
• <S8VK-S06024 Only>
The total output current must be 4 A max.
• Adjust the output voltage difference of each Power Supply to
50 mV or less, using the output voltage adjuster (V. ADJ).
• If the output current from the Power Supplies is not balanced, the
Power Supply with the higher output voltage will operate in an
overcurrent protection state, which will extremely reduce its service
life. After you adjust the difference in the output voltages between
the Power Supplies, make sure that the currents are well balanced.
• Using the parallel operation will not satisfy UL1310 Class2 output.
• For Parallel Operation, to balance the current of the each unit, the
length and thickness of each wire connected to the load and each
unit must be same as much as possible.
• If you use the output voltage may drop by several volts if the load
changes rapidly (e.g., if the load starts or is disconnected). Use the
S8VK-R or connect external diodes as shown in the figure.
For parallel operation with 30, 60 and 120-W power supplies, use
the S8VK-R10 model. For parallel operation with 240-W power
supplies, use the S8VK-R20 model.
• Do not use parallel operation when there is the possibility that the
input voltage will vary outside of the rated input range.
• Use the following information as a guide to the diode type,
dielectric 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
INPUT
+V
−
V
INPUT
+V
−
V
Load
INPUT
+V
+V
0 V
−
V
−
V
INPUT
+V
−
V
Load
Load
INPUT
+V
D
2
D
1
−
V
INPUT
+V
−
V
Load
Load
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
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
Load
INPUT
INPUT
S8VK-S
S8VK-S
