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6 MAINTENANCE AND INSPECTION
6.2 Periodic Inspection
6.2 Periodic Inspection
This section describes items that must be inspected one or two times every six months to one year.
When the equipment has been relocated or modified, or wiring layout has been changed, inspect the items.
*1 The temperature in the control panel installed a programmable controller is called the ambient temperature.
*2 When an extended temperature range base unit is used, each module can be used in the environment of 0 to 60.
Item Inspection Item Inspection method Judgment criteria Corrective action
1 Environment Ambient temperature
*1
Measure the temperature by
using a thermometer.
0 to 55
*2
Create the environment that
satisfies the judgment criteria
Ambient humidity Measure the humidity by using
a hygrometer.
5 to 95%RH
Atmosphere Measure corrosive gases. No corrosive gases
2 Power supply voltage check Measure a voltage between the
terminals of 100/200VAC and
24VDC.
85 to 264VAC Change the supply power.
15.6 to 31.2VDC
3 Installation Looseness and rattling Touch the module to check for
the looseness and rattling.
The module must be mounted
securely.
Retighten the screws.
If the module is loose, fix the
module with screws.
Attachment of dirt and
foreign matter
Check visually. Dirt and foreign matter must
not be attached.
Remove them. Clean the
programmable controller.
4 Connection status Terminal screw
loosening
Check for the terminal screw
loosening.
The terminal screws must not
be loose.
Retighten the screws.
Clearance between the
solderless terminals
Check visually. The proper clearance must be
provided between solderless
terminals.
Provide the proper clearance.
Connector loosening Check visually. The cable connector must not
be loose.
Connect the connector with no
loosening securely.
5 Battery Check the BATTERY LED on
the CPU module.
The LED must be off. Replace the battery when the
LED is on.
Check the length of term after
purchasing the battery.
The battery must not be used
more than five years.
Replace the battery if it has
been used more than 5 years.
Check that SM51 or SM52 is
turned off using a engineering
tool.
SM51 or SM52 must be off. Replace the battery when
SM51 or SM52 is on.
6 Module diagnostics Check an event history using
the module diagnostics.
An event history must not be
updated.
GX Works3 Operating
Manual
7 Maximum scan time Check the values of SD526
and SD527 using a
engineering tool.
Maximum scan time must be
within the allowable range
given in the specification of the
system.
Specify causes that increase
the scan time.
Check the operation status of
the trigger signal that passes
through a loop if loop positions
exist in the sequence program.
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