![background image](http://html1.mh-extra.com/html/omron/r88a-mcw151-drt-e/r88a-mcw151-drt-e_operation-manual_742243249.webp)
234
Routine Inspections
Section 9-1
9-1
Routine Inspections
In order for your MC Unit to continue operating at optimum condition, periodic
inspections are necessary. The main components of the Unit are semicon-
ductors and have a long service life, but depending on the operating environ-
ment, there may be more or less deterioration of these and other parts. A
standard inspection schedule is once every six months to one year. More fre-
quent inspections may be advisable depending on the operating environment.
Maintain the inspection schedule once it has been set.
Inspection Points
Check to be sure that the power supply, ambient temperature, humidity, and
other specifications are within the specifications. Be sure that there are no
loose screws and that all battery and cable connections are secure. Clean
any dust or dirt that has accumulated.
Item
Inspection points
Criteria
Remarks
I/O Power
Supply
Measure the voltage variations at
the I/O power supply terminal block.
Do they meet the standards?
24 VDC: 20.4 to 26.4 VDC
With a voltage tester, check
between the terminals and make
sure that the power supply falls
within the acceptable range.
Installation
and wiring
Is the MC Unit securely mounted?
There must be looseness.
With a Phillips screwdriver, tighten
all mounting screws.
Are the cable connectors properly
inserted and locked?
Carefully insert and lock all cable
connectors.
Are there any loose screws in the
external wiring?
With a Phillips screwdriver, tighten
all screws in the external wiring.
Are any crimp terminals for external
wiring too close together?
There must be sufficient dis-
tance between them.
Do a visual check and separate the
terminals as required.
Are any external cables discon-
nected?
There must be no external
abnormalities.
Do a visual check and connect or
replace cables as required.
Environment
conditions
Is the ambient temperature within
the acceptable range? (When used
in a panel, the ambient temperature
inside the panel must be checked.)
0 to 55
°
C
With a thermometer, check the
ambient temperature inside the
panel and make sure that it falls
within the acceptable range.
Is the ambient humidity within the
acceptable range? (When used in a
panel, the ambient temperature
inside the panel must be checked.)
10% to 90% RH (with no con-
densation)
With a hydroscope, check the
ambient humidity inside the panel
and make sure that it falls within the
acceptable range.
Is the Unit exposed to direct sun-
light?
It must not be exposed to
direct sunlight.
Shield the Unit from direct sunlight.
Is there any accumulation of dust
(especially iron dust) or salts?
There must be none of these
present.
Remove any accumulation of dust
or salts and protect against them.
Is the Unit exposed to any spray of
water, oil, or chemicals?
It must not be exposed to any
of these.
Protect the Unit from water, oil, and
chemicals.
Is the location subject to corrosive
or flammable gases?
The Unit must not be exposed
to these.
Check for smells or use a gas sen-
sor.
Is the location subject to shock or
vibration?
The amount of shock or vibra-
tion must be within the
acceptable ranges given in
the specifications.
Install a cushion or other device to
reduce shock and vibration.
Is the location near any source of
noise?
There must be no noise.
Remove the Unit from the noise
source or apply countermeasures.