Inspection And Maintenance - Omron CP1E Series User Manual

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Inspection and Maintenance

Inspection
No.
points
1 Power sup-
ply voltage
2 I/O power
supply
3 Ambient
environment
4 Installation
and wiring
CP1E CPU Unit Hardware User's Manual(W479)
Inspection
Check for voltage fluctuations
at the power supply terminals.
Check for voltage fluctuations
at the I/O terminals.
Check the ambient tempera-
ture. (Inside the control panel
if the PLC is in a control
panel.)
Check the ambient humidity
(inside the control panel if the
PLC is in a control panel).
Check that the PLC is not in
direct sunlight.
Check for accumulation of
dirt, dust, salt, metal filings,
etc.
Check for water, oil, or chemi-
cal spray.
Check for corrosive or flam-
mable gases in the area of the
PLC.
Check the level of vibration or
shock.
Check for noise sources near
the PLC.
Check that the Option Boards
and cable connectors are fully
inserted and locked.
Check for loose screws in
external wiring.
Check crimp connectors in
external wiring.
Check for damaged external
wiring cables.
7 Maintenance and Inspection
Criteria
Allowable voltage Use a voltage tester to check the
range: 85 to 264 power supply at the terminals. Take
VAC (+10%/-15%) necessary steps to bring voltage fluc-
tuations within limits.
Voltages must be Use a voltage tester to check the
within I/O specifica- power supply at the terminals. Take
tions for each Unit. necessary steps to bring voltage fluc-
tuations within limits.
0 to 55°C Use a thermometer to check the tem-
perature and make sure that the
ambient temperature remains within
the allowed range of 0 to 55ºC.
Relative humidity Use a hygrometer to check the
must be 10% to humidity and ensure that the ambient
90% with no con- humidity remains between 10% and
densation. 90%.
Make sure that condensation does
not occur due to rapid changes in
temperature.
Not in direct sun- Protect the PLC if necessary.
light
No significant accu- Clean and protect the PLC if neces-
mulation sary.
No spray on the Clean and protect the PLC if neces-
PLC sary.
No corrosive or Check by smell or use a sensor.
flammable gases
Vibration and shock Install cushioning or shock absorbing
must be within equipment if necessary.
specifications.
No significant noise Either separate the PLC and noise
sources source or protect the PLC.
No looseness Correct any improperly installed con-
nectors.
No looseness Tighten loose screws with a Phillips
screwdriver.
Adequate spacing Check visually and adjust if neces-
between connec- sary.
tors
No damage Check visually and replace cables if
necessary.
Remedy
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