14
Power Supply
Technical Information
Location
Problem
Details
Countermeasures
Operation
The Power Supply’s fuse is
broken.
Foreign particles, liquids, condensation, or dust
from the operating environment has entered the
Product and damaged the internal circuits.
Many holes are provided on the Product to assist with heat dissipation.
Therefore, do not install the product in an environment where foreign
particles, liquid, or other substance can enter the Product.
In this case, the internal circuits are damaged. Replace the Power Sup-
ply.
The Power Supply is gener-
ating high heat.
The Power Supply’s installation space is too
confined and does not allow sufficient heat dissi-
pation.
The Power Supply handles a large amount of power, so heat generation
occurs even with normal use. Check the installation space, Power
Supply load, and ambient temperature again.
Particularly if the load current exceeds the ratings for the Power Supply,
change so that the load current is within the ratings.
Continuing to use as is may damage the Power Supply.
The Power Supply’s load exceeds the ratings.
The ambient temperature is too high.
The Power Supply is emit-
ting a noise.
The load has exceeded the ratings, activating
the overcurrent protection circuit and the internal
oscillatory frequency is within audible range.
When the protection circuit is operating, a vibrating sound emitting from
the Power Supply may be audible. Even during normal operation, slight
sound is generated by the Power Supply circuit due to the oscillator.
If the oscillating sound is too loud compared with that of the same Prod-
uct, the internal circuits may be damaged. Consult your OMRON repre-
sentative.
The connected Sensor is
always ON.
The display on the Digital
Panel Meter is erratic.
The analog sensor data is
erratic.
The connected Sensor has malfunctioned due
to noise from the Power Supply (noise between
the outputs and ground).
The Power Supply has an internal oscillator that generates noise even
during normal operation. Therefore, malfunction may result depending
on the Sensor used.
If the Sensor malfunctions, connect a film
capacitor with a capacitance of approxi-
mately 0.1
μ
F and a dielectric strength of
500 VDC minimum between the output termi-
nal (+V or
−
V) and the ground terminal (
).
Output from the Power
Supply has stopped (light-
ning occurred)
Overvoltage is being applied to the Power Sup-
ply due to inductive impulse from the lightning.
(Output may also have stopped due to the over-
voltage protection function being activated.)
If overload protection is operating, turn OFF the input power and then
turn it back ON again. If the output still does not recover, the internal
components are possibly damaged due to the overvoltage. Replace the
Power Supply.
The output voltage is unsta-
ble.
Load fluctuation has activated the overcurrent
protection function.
Select a Power Supply capacity that takes the load fluctuation into con-
sideration so that the rated output current will not be exceeded.
Sufficient load current cannot be supplied due to
low input voltage, thereby activating the overcur-
rent protection function.
Use an input voltage within the allowable range.
The voltage applied to the
load is unstable.
The Power Supply’s output voltage has dropped
due to the load’s inrush current.
If an inrush current is flowing to the load, consider selecting a capacity
that allows for the inrush current.
The voltage applied to the
load is low.
The load lines are either too thin or too long,
causing a voltage drop.
Use load lines with wire diameters that are suitable for the rated output
current.
Output from the Power
Supply has stopped.
Surge or other overvoltage has been applied
externally (e.g., load) to the output side, activat-
ing overvoltage protection.
Add a varistor and diode to the source of the surge, and make sure that
overvoltage is not applied to the Power Supply’s outputs.
The incorrect input voltage (applying 100 V
when the setting is 200 V) has been applied.
(If 100 V is applied when the voltage is set to
200 V, although damage will not occur immedi-
ately, damage will occur if use is continued.)
Make sure that the input voltage is the same as the voltage set using the
selector terminals.
The internal circuits may be damaged. Replace the Power Supply.
Output from the Power
Supply has stopped (close
to source of vibration or
shock).
Cracks have occurred in the internal soldering
due to vibration in the operating environment,
preventing electrical conduction. (The vibration
and shock are particularly close to the contac-
tor.)
If vibration occurs during operation, check the installation location and
reduce vibration or consider inserting vibration-proof rubber between
the Power Supply and its mounting surface.
Output from the Power
Supply has stopped
(close to source of strong,
high-frequency noise).
Damage has occurred due to impulse from the
input line.
If impulse occurs in the input line, separate the Power Supply’s input line
from the source of the impulse. If separation is not possible, connect a
varistor either to the source of the noise or to the Power Supply’s input
terminals.
Also incorporate a fuse that will
provide protection if the varistor is
short-circuited and damaged.
Long-
term
use
Output from the Power
Supply has stopped
(the fan has stopped).
The fan’s life has expired, preventing forced
cooling, and the internal temperature has risen
activating overheating protection.
Perform periodic maintenance on the forced cooling fan and replace the
fan promptly if any fault in the fan is found.
The fan bearings have been worn down due to
the operating environment (e.g., dust or dirt).
Perform periodic maintenance on the forced cooling fan and make sure
that there is no dust or dirt present in the operating environment.
The output is unstable.
The terminals have become loose.
Retighten the terminals to the specified torque.
The output drops.
The life of the internal components has expired.
The service life of the Power Supply’s built-in electrolytic capacitor
depends on the ambient temperature and load rate, and its structural life
depends on the operating environment (vibration, shock).
Replace the Power Supply together with other Power Supplies that were
purchased at the same time.
Ripple noise has increased.
AC (L)
AC (N)
