Overcurrent Protection; Parallel Operation; Series Operation - Omron S8FS-G Series Manual

Overcurrent Protection

• Internal parts may possibly deteriorate or be damaged if a short-
circuited, overload, or boost load state continues during operation.
• Internal parts may possibly deteriorate or be damaged if the Power
Supply is used for applications with frequent inrush current or
overloading at the load end. Do not use the Power Supply for such
applications.
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 operation.
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 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 )
RRM
Forward current (I )
F
2. Although Power Supply having different specifications can
be connected in series, the current flowing through
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/negative outputs by using two Power Supplies. You can
make positive/negative outputs with any of the models. If you use
positive/negative outputs, connect two Power Supplies of the same
model as shown below. You can combine models with different
output capacities and output voltages. However, use the lower of
the two rated 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. If the list of models that support series connection
of outputs says that an external diode is not required, an external
diode is also not required for positive/negative outputs.
+V
INPUT
-V
+V
INPUT
-V
Schottky Barrier diode
Twice the output voltage or above
Twice the rated output current or above
+V
+V
INPUT
-V
0V
+V
INPUT
-V -V
+V
INPUT D
1
-V
+V
INPUT D
2
-V
• Use the following information as a guide to the diode type, dialectic
strength, and current.
Type
Dielectric strength (V ) Twice the output voltage or above
RRM
Forward current (I ) Twice the rated output current or above
F

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.
INPUT
INPUT
Power Supplies without the Parallel Operation Option
Parallel operation is not possible.
S8FS-G60024@-W@
(Models with the Parallel Operation Option)
Up to five Power Supplies can be connected in parallel operation.
You must meet the following conditions to use parallel operation.
• The internal parts may occasionally deteriorate or be damaged. To
operate in parallel, set the switch to the "PARALLEL" side.
• For parallel operation, always use Power Supplies with the same
model number.
• Use the output voltage adjusters (V. ADJ) to adjust the difference
in the output voltages to 50 mV or less between Power Supplies
that are used in parallel operation.
• The length and thickness of each wire connected to the load must
be the same so that there is no difference in the voltage drop value
between the load and the output terminals of each Power Supply.
• Drastic fluctuations in the load (including fluctuations that occur
when starting and starting the load) may reduce the output voltage.
If fluctuations in the output voltage that result from drastic
fluctuations in the load would be a problem, connect external
diodes as shown in the following diagram.
• Use the following information as a guide to the diode type, dialectic
strength, and current.
Type
Dielectric strength (V ) Twice the output voltage or above
RRM
Forward current (I ) Twice the rated output current or above
F
INPUT
INPUT
S8FS-G
Schottky Barrier diode
S8FS-G
+V
-V
S8FS-G
+V
-V
Schottky Barrier diode
+V
-V
+V
-V
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