Chapter 11 Maintenance MASTER-K
11-1
11 Maintenance
Be sure to perform daily and periodic maintenance and inspection in order to keep the PLC
system in the best conditions.
11.1 Maintenance and inspection
The most of parts of PLC modules are consist of semiconductor devices, and their service life is
semi-permanent. However, a bad environment can shorten the lifetime of parts or cause a
defection of PLC system. Therefore, check the followings items one or two times in a six months.
Items Judgment criteria Corrective action
Temperature
0 ~ 55°C ( 32 ~ 131°F )
Humidity 5 ~ 95 % RH
Adjust the temperature or / and humidity
as not exceed the operation temperature /
humidity range.
Environment
Vibration No vibration
Use a insulation resist rubber or other
prevention methods
Mounting condition of
modules
No loose modules Mount a module firmly on base
Terminal block screw No loose screws Fasten a screw firmly with rated torque
Power voltage ripple -15 % ~ +10% Adjust the power voltage
Spare parts No lack of spare parts Supplement spare parts
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