Datasheet

S8FS-C
35
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.
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.
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
1, D2) as shown in the following figure.
 Select a diode having the following ratings.
Parallel Operation
Parallel operation is not possible.
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.
 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
F) of diodes D1 and D2.
 Power loss occurs equivalent to the Power Supply output current
(I
OUT) times the diode forward voltage (VF), and heat is generated.
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.
Reference Value
Type Schottky Barrier diode
Dielectric strength (V
RRM) Twice the rated 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 rated output voltage or above
Forward current (I
F) Twice the rated output current or above
Correct
+V
−V
AC (L)
AC (N)
AC (L)
AC (N)
+V
−V
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 rated output voltage or above
Forward current (I
F) Twice the rated output current or above
Reliability
(MTBF)
Value
Single phase model
15 W: 1,080,000 hrs
25 W: 890,000 hrs
35 W: 670,000 hrs
50 W: 560,000 hrs
75 W: 580,000 hrs
100 W: 540,000 hrs
150 W: 530,000 hrs
200 W: 450,000 hrs
350 W: 190,000 hrs
Definition
MTBF stands for Mean Time Between
Failures, which is calculated according to the
probability of accidental device failures, and
indicates reliability of devices.
Therefore, it does not necessarily represent a
life of the product.
Life expectancy 10 yrs. Min.
Definition
The life expectancy indicates average
operating hours under the ambient
temperature of 40°C and a load rate of 50%.
Normally this is determined by the life
expectancy of the built-in aluminum electrolytic
capacitor.
+V
−V
AC (L)
AC (N)
AC (L)
AC (N)
+V
−V
Incorrect
Parallel
Operation
+V
A
B
D
1
D
2
−V
+V
−V
Load