User manual

85
Periodic inspection and maintenance items
The NX-CPU700p controller requires periodic inspection and
maintenance for proper operation. The following items should be
checked every six months, but the period can be shortened according
to the operational environment.
Precautions when troubleshooting
• Always turn off the power whenever installing or removing modules.
• Check the module once more before replacing the defective part.
• Return the defective module for repair with any detailed information
about its problems.
• When a contact is defective, clean the contact with a clean cotton and
alcohol and then retest the module.
• Do not use thinner to clean since it might cause discoloration on the
module’s case.
Item Check item Requirement Remarks
Supplied power
Does the voltage measured within the
power terminal fall within the specified
range?
Voltage must be within the
power module input voltage
specifications.
Voltmeter
Environment
Does the temperature fall within the
specified range?
0 to 55 °C Thermometer
Does the humidity fall within the
specified range?
35 to 85%RH Hygrometer
Is there any dust present? No dust Visual
I/O power
Does the control voltage supplied to the I/
O modules fall within the specified limit?
Control voltage must be
within the input and output
modules specifications.
Voltmeter
Module
mounting and
wiring
Are all modules firmly mounted?
All should be firmly secured. ScrewdriverIs the connection cable firmly wired?
Is the external wiring screw tight?
Life expectancy
of parts
Contact relay
Electric lifetime:
100,000 to 300,000 operations
Battery 3 years at 25 °C