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Recommended Maximum Current
The table is applicable to wires with 1 to 4 conductors. Keep the cur-
rent value to within 80% of the values shown in this table when using
wires having 5 or more conductors.
XH Connector Preparation
The following Products are provided with the S8VM-05024A@/P@,
S8VM-10024A@/P@ and S8VM-15024A@/P@ for the undervoltage
alarm transistor output wiring.
Connector
S8VM-
05024A@/P@
S3B-XH-A-1
Housing (provided) XHP-3
Terminal (provided) BXH-001T-P0.6 or SXH-001T-P0.6
Be sure to prepare the connector according to the following instruc-
tions to ensure correct wiring. For details, refer to the JST catalog.
• Use a wire size of AWG22 to AWG28.
• The guideline for the length of sheath to be stripped from the wire is
2.1 to 2.6 mm.
• Use either a YC or YRS Crimping Tool (manufactured by JST) to
crimp the terminal and wire.
• Be sure to insert the crimped terminal wires into the housing fully
until a click is heard. Also, make sure that the wires attached to the
housing are securely locked in place.
Installation Environment
Do not use the Power Supply in locations subject to shocks or
vibrations. In particular, install the Power Supply as far away as
possible from contactors or other devices that are a vibration source.
Install the Power Supply well away from any sources of strong, high-
frequency noise and surge.
Operating Life
The life of a Power Supply is determined by the life of the electrolytic
capacitors used inside. Here, Arrhenius Law applies, i.e., the life will
be halved for each rise of 10° C or the life will be doubled for each
drop of 10° C. The life of the Power Supply can thus be increased by
reducing its internal temperature.
Ambient Operating and Storage
Environments
Store the Power Supply at a temperature of − 25 to 65°C and a
humidity of 25% to 90%.
The Internal parts may occasionally be deteriorated or damaged.
Do not use the Power Supply outside the derating range (i.e., under
conditions indicated by the shaded area (
curve diagrams on page 7.)
Use the Power Supply at a humidity of 30% to 85%.
Do not use the Power Supply in locations subject to direct sunlight.
Do not use the Power Supply in locations where liquids, foreign
matter, or corrosive gases may enter the interior of the product.
Overcurrent Protection
Internal parts may occasionally deteriorate or be damaged if a short-
circuited or other overcurrent state continues during operation.
Eliminate the overcurrent state as soon as possible.
Internal parts may possibly be deteriorated or 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.
24
20
Switch Mode Power Supply
S8VM-10024A@/P@ Manu-
factured
S8VM-15024A@/P@
by JST
BH3B-XH-2
) in the derating
S8VM
Charging the Battery
If a battery is to be connected as the load, install an overcurrent
limiting circuit and an overvoltage protection circuit.
Dielectric Strength Test
If a high voltage is applied between an input and the case (PE/FG), it
will pass though the LC of the built-in noise filter and energy will be
stored. If the high voltages used for dielectric strength testing are
turned ON and OFF with a switch, timer, or similar device, impulse
voltage will be generated when the voltage is turned OFF and
internal parts may possibly be damaged. To prevent the generation
of impulse voltages, reduce the applied voltage slowly with a variable
resistor on the test device or turn the voltage ON and OFF at the
zero-cross point.
When performing the test, be sure to short-circuit all the output
terminals to protect them from damage.
Insulation Test
When performing the test, be sure to short-circuit all the output
terminals to protect them from damage.
Inrush Current
When two or more Power Supplies are connected to the same input,
inrush current is added to the total current. Select fuses and circuit
breakers giving sufficient consideration to the fusing or operating
characteristics so that fuses will not burn and breakers will not break
due to inrush current.
Output Voltage Adjuster (V.ADJ)
Default Setting: Set at the rated voltage
Adjustable Range: Adjustable with output voltage adjuster (V.ADJ) on
the front panel of the Product from − 20% to 20% of the rated output
voltage (− 10% to 20% of the rated voltage for S8VM-@@@24A@/P@)
Turning clockwise increases the output voltage and turning
counterclockwise decreases the output voltage.
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.
The output voltage may increase beyond the allowable voltage range
(up to +20% of the rated voltage) depending on the operation of the
output voltage adjuster (V.ADJ). When adjusting the output voltage,
check the output voltage of the Power Supply and be sure that the
load is not damaged.
When increasing the output voltage to more than +20% of the rated
value using the output voltage adjuster (V. ADJ), the overvoltage
protection function may operate.
(S8VM-@@@24A@/P@ Only)
Turn the output voltage adjuster (V.ADJ) slowly. When decreasing the
output voltage quickly, or when adjusting the output voltage to less
than − 10% of the rated value, the undervoltage alarm function may
operate.
DIN Rail Mounting
When mounting to a DIN Rail, lower the
S8VM onto the Rail until the Rail stopper
clicks into place, hook section A over the
edge of the Rail and push in the direction of
B.
To remove the S8VM from the DIN
Rail, insert a screwdriver into section
C and pull the S8VM away from the
Rail.
Switch Mode Power Supply S8VM
A
B
30 mm min.
C
Rail stopper
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