12-2
Section
Routine Inspections
309
12-2 Routine Inspections
In order for your PCU to continue operating at optimum condition, periodic
inspections are necessary. The main components of the PCU are semiconduc-
tors and have a long service life, but depending on the operating environment,
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 frequent inspec-
tions may be advisable depending on the operating environment. Maintain the
inspection schedule once it has been set.
Inspection Points
No.
Item
Inspection points
Criteria
Remarks
1
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
5 VDC: 4.75 to
5.25 VDC
With a voltage tester,
check between the
terminals and make sure
that the power supply
falls within the
acceptable range.
2
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 humidity inside the
panel must be checked.)
10% to 90% RH (with no
condensation)
With a hydroscope,
check the ambient
humidity inside the panel
and make sure that it
falls within the
acceptable range. In
particular, check that
there is no condensation
due to sudden changes
in temperature.
Is the PCU exposed to direct sunlight?
It must not be exposed
to direct sunlight.
Shield the PCU 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
(especially iron dust) or
salts and protect against
them.
Is the PCU exposed to any spray of
water, oil, or chemicals?
It must not be exposed
to any of these.
Protect the PCU from
water, oil, and
chemicals.
Is the location subject to corrosive or
flammable gases?
The PCU must not be
exposed to these.
Check for smells or use
a gas sensor.
Is the location subject to shock or
vibration?
The amount of shock or
vibration 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 PCU from
the noise source or
apply countermeasures.
Summary of Contents for CS1W-NC113 - REV 02-2008
Page 1: ...CS1W NC113 213 413 133 233 433 Position Control Units ...
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