Power Supply
Technical Information
13
Power
supp
lies
Be sure to check the following points if the Power Supply is not operating properly before requesting repairs.
If the Power Supply still does not operate normally, contact your OMRON representative.
Location
Problem
Details
Countermeasures
Dielectric
strength
inspec-
tion
The result of dielectric
strength test is NG.
Impulse occurred damaging the Power Supply
when the dielectric strength was applied or shut
off using a switch or other means.
Either gradually change the applied dielectric strength using a variable
resistor or apply voltage at zero cross (applied from 0 V).
Dielectric strength has been applied to the incor-
rect location.
The voltage value depends on the location at which dielectric strength
is applied. Test using the dielectric strength value specific to each
Product.
Inspection was conducted with the short bar con-
nected between the ACG and PE terminals.
Remove the short bar from between the ACG and PE terminals (on
applicable models), and then test the dielectric strength and insulation
resistance.
Turning
ON the
power for
the first
time
The output does not turn
ON.
•
Output voltage is low.
•
Output indicator is not
lit.
•
Output indicator is
dim.
The overcurrent protection function has been
activated by the startup current of the load that is
connected to the Power Supply, even if the cur-
rent was within the Power Supply’s capacity
when stationary.
Use inverse L overcurrent protection characteristics or consider raising
the Power Supply’s capacity by one rank.
The Power Supply’s load has exceeded the rat-
ings, thereby activating the overcurrent protection
function.
Select a Power Supply capacity that is sufficient for the load current.
The Power Supply’s outputs are short-circuited.
Remove the cause of the output short-circuit.
A buzzing noise is heard
when the input turns ON.
A buzzing noise can be heard when turning ON
the input of models equipped with harmonic cur-
rent suppression circuits due to the internal
inrush current.
Models with harmonic current suppression circuits generate a noise
when the input is turned ON but this is a transient noise that occurs
until the internal voltage is stabilized, and does not indicate that any
problem in the product.
An output delay occurs in
the output turning ON.
If a capacitive load (capacitor) is connected to
the Power Supply’s load, the inrush current on
the load side will cause the output to enter the
protection range when it turns ON.
If inrush current flows to the load, consider selecting a capacity that
allows for the inrush current.
The output voltage is high.
The adjuster setting is high.
Adjust the output voltage using the Output Voltage Adjuster (V.ADJ).
The output voltage is high
(caused damage to the
load).
The damage to the internal parts has prevented
the feedback control from performing properly.
The internal circuits are possibly damaged. Consult your OMRON rep-
resentative.
The output indicator lights
but turns OFF quickly (over-
voltage protection is pro-
vided)
The remote sensing terminals are open.
When not using remote sensing, short-circuit
terV and +S, and also terminals
−
V
and
−
S.
The overvoltage protection function will oper-
ate, so turn OFF the input power and then turn
it back ON again.
The internal control circuit has malfunctioned,
thereby activating the overvoltage protection
function.
Turn OFF the input power and then turn it back ON again. If the prob-
lem reoccurs, the internal circuits are possibly damaged. Consult your
OMRON representative.
An electric shock is felt
when touching the Power
Supply.
The casing may not be properly grounded.
Connect the ground terminal to the ground.
The input breaker is operat-
ing. The external fuse is
broken.
The Power Supply’s inrush current has tripped
the breaker.
Check the inrush current of each Product in the system and make sure
that the fuse and breaker ratings are sufficient.
(The inrush current of the Power Supply is several times to several tens
of times the normal current.)
The Power Supply’s fuse is
broken.
The internal circuit has short-circuited due to wire
clippings, or other foreign particles, or mounting
screws.
The internal circuits are possibly damaged. Consult your OMRON rep-
resentative.
White smoke was emitted
from the Power Supply.
The incorrect input power is being applied.
The white smoke indicates the vaporization of the
electrolytic fluid in the internal electrolytic capaci-
tor due to overvoltage.
Check the power input location and input voltage again.
This problem indicates that the internal circuits are damaged. Replace
the Power Supply.
There is no output.
A load is connected to the remote sensing termi-
nals.
The output current cannot be received from the remote sensing termi-
nals +S and
−
S. Connect the load lines to the output terV and
−
V.
Alternatively, the overvoltage protection function is operating, so turn
OFF the input power and then turn it ON again.
The remote control terminals are open.
When not using remote control, short-circuit
the terRC and
−
RC.
