OMRON provides many types of general-purpose
Power Supplies, such as the type mounted to DIN rail or the type built
into equipment. OMRON also provides the S8VS which provides notification
of replacement timing, and the Buffer Block that handles momentary power
interruptions, and other highly reliable Power Supplies.
What is a Power Supply?
Commercial AC power distributed from power plants cannot be supplied
directly to the ICs and other electronic components built into electronic
devices in automated office and factory equipment without destroying the
components due to the high voltage of commercial AC power. Devices called
power supplies or regulated DC power supplies are therefore required to
convert commercial AC power into regulated DC power to drive ICs and other
Regulated DC Power Supplies
The methods for controlling Regulated DC Power Supplies can be largely
classified into the following two types. Switch-mode power supplies and
linear power supplies are generally referred to as power supplies.
Currently, switch-mode power supplies are the most prevalent.
Switch-mode Power Supplies
Switch-mode power supplies convert commercial AC power into the required
high-frequency DC power using the high-speed switching of semiconductors.
Switch-mode power supplies are so compact, light, and efficient that they
are used as power supplies by most electronic devices.
• Highly efficient.
• Compact, and light.
• A wide input voltage range.
• Switching noise is generated.
• Large inrush current on primary side.
Power Supply Selection
Basic Selection Points:
Factors to consider when selecting a Power Supply are provided in the
The following functions are available:
overcurrent protection, overvoltage protection, harmonic current control,
and alarm outputs. The functions that are provided depend on the model.
Check the function specifications.
All models provide overcurrent protection.
The protection method that is used will affect startup characteristics.
The warranty period and life expectancy of
the Power Supply depend on the model.
Select a model with suitable specifications for your application.
Periodic maintenance is required for the cooling fan.
Install the Power Supply so that there is
sufficient space for air to flow around it.
The mounting direction and space requirements are specified for each
model. The load rate may have to be reduced depending on the installation
Select the newest models to allow for the
inrush current of the Power Supply.
Make sure that the circuit breaker will not be tripped by inrush current.
Even for the same model, the inrush current will be different for 100 VAC
and 200 VAC.
» Glossary of Power
Switch Mode Power
Improved versions of Standard-type
Power Supplies without indication monitor (60 to 240 W).
Switch Mode Power
Low-profile, Cost-effective Power
Supply to help reduce panel depth.
3-phase Input Switch
Mode Power Supply
DIN-rail mounting, Power Supply with a
range of 5 A to 40 A output current.