Maintenance Of The Nt20; Inspection And Cleaning - Omron NT20 User Manual

Maintenance of the NT20

7-3

Maintenance of the NT20

!WARNING
Spare PT
Backlight
7-4

Inspection and Cleaning

Cleaning Method
Note
Inspection Method
Carry out maintenance work in order to ensure that the NT20 is always used
in its optimum condition.
Do not attempt to take the PLC apart and do not touch any internal parts while
the power is being supplied. Doing either of these may result in electrical
shock.
It is advisable to have a spare NT20 available to minimize system downtime in
the event of an NT20 failure or if the screen display becomes difficult to read
due to deterioration of the display unit.
The backlight must be replaced when the brightness of the display backlight
dims and the display becomes difficult to see. The backlight cannot be
replaced by the user.
Contact your nearest OMRON representative.
Clean and inspect the NT20 regularly to ensure that it is always used in its
optimum condition.
If the display is dirty the screen is difficult to see. Clean the screen from time
to time as follows.
• In daily cleaning, wipe the display with a soft dry cloth.
• If the soiling cannot be removed with a dry cloth, wet the cloth with water,
wring it out well and wipe the display with it.
• If rubber or vinyl products, tape, etc. are left stuck to the display for long
periods they will cause staining. If such items are stuck to the display,
remove them during cleaning.
Never use volatile solvents such as benzene or thinners, or dusters.
In normal environments, inspect the NT20 at intervals of between 6 months
and a year. In environments that are extremely hot and humid, or very dusty
environments, shorten the inspection interval.
• Items Required for Inspection
Prepare the following items before starting the inspection.
• The tools supplied with the NT20
• Screwdrivers (Phillips, flat-head)
• Tester (or digital voltmeter)
• Industrial alcohol
• 100% cotton cloth
• Hygrometer (required in some cases)
• Thermometer (required in some cases)
• Synchroscope (required in some cases)
• Pen-writing oscilloscope (required in some cases)
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