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S8FS-C
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
capacity or output current does not exceed the rated output
capacity or rated output current.
Series Operation
Two Power Supplies can be connected in series.
Correct
Note: 1. If the load is short-circuited, a reverse voltage will be
generated inside the Power Supply. If this occurs the Power
Supply may possibly deteriorate or be damaged. Always
connect a diode as shown in the figure. Select a diode
having the following ratings.
Type
Dielectric strength (V
) Twice the rated output voltage or above
RRM
Forward current (I
)
F
2. Although Power Supplies 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 shown 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 operate in series. Therefore,
connect bypass diodes (D
• Select a diode having the following ratings.
Type
Dielectric strength (V
) Twice the rated output voltage or above
RRM
Forward current (I
)
F
38
AC (L)
+V
−V
AC (N)
AC (L)
+V
−V
AC (N)
Schottky Barrier diode
Twice the rated output current or above
+V
+V
INPUT
−V
0 V
+V
INPUT
−V
−V
, D
) as shown in the following figure.
1
2
+V
INPUT
D
1
−V
+V
INPUT
D
2
−V
Schottky Barrier diode
Twice the rated output current or above
Parallel Operation
Parallel operation is not possible.
Parallel
Operation
Incorrect
Backup Operation
Backup operation is possible if you use two Power Supplies of the
same model.
Connect diodes as shown in the following figure for backup operation.
Select a diode having the following ratings.
Type
Dielectric strength (V
) Twice the rated output voltage or above
RRM
Forward current (I
)
Twice the rated output current or above
F
• The output voltages of Power Supplies A and B output must be set
higher only by a value equivalent to the drop in forward voltages
(V
) of diodes D
and D
.
F
1
2
• Power loss occurs equivalent to the Power Supply output current
(I
) times the diode forward voltage (V
OUT
The diode must be cooled to ensure that its temperature is kept at
or below the value indicated in the diode catalog.
• There will be a power loss caused by load power and diodes. Be
sure that this total power loss does not exceed the rated output
power (rated output voltage times rated output current) of each
Power Supply.
In Case There Is No Output Voltage
There is a possibility that functions such as overcurrent protection,
over-voltage protection or overheating protection are functioning. The
internal protection circuit 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 protection 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.
• Check overheating protection (350-W model):
Switch off the input power supply and switch back on after allowing
sufficient time for cooling.
Charging Batteries
If you connect a battery at the load, install overcurrent control and
overvoltage protection circuits.
AC (L)
+V
AC (N)
−V
AC (L)
+V
AC (N)
−V
A
D
1
+V
−V
B
D
2
+V
−V
Schottky Barrier diode
), and heat is generated.
F
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