6-3
6 Maintenance and Troubleshooting
NB-series Programmable Terminals Startup Guide Manual(V109)
6-2 Checking and Cleaning
6
6-2 Checking and Cleaning
This section describes the inspection and cleaning method for the NB Unit.
Please clean and check the NB Series periodically to ensure the NB Series always in the optimal
status.
z Cleaning method
If the display part is dirty, then the screen will hard to see. Please perform cleaning periodically
according to the following points:
• During the daily cleaning, please use the dry soft cloth. But if use the dry soft cloth to clean
forcefully when it is too dirty, the front panel may be damaged. In this case, use the wet cloth to
clean it in advance.
• When the dirt cannot be cleaned by dry cleaning, please dip the cloth into the diluted neutral
washing agents (concentration of 2%) completely first, and then perform cleaning after the wet
cloth is wringed out.
• Waste, ethylene products or tape sticking to the Unit for a long period will generate dirt. If there is
dirt sticking to the Unit, please remove it during the cleaning.
Do not use volatile solvents such as benzine or paint thinner, or chemical cloth.
z Checking method
Please perform checking once every 6 months to 1 year. But the frequent checking should be
necessary when the Unit is used in the extreme environments such as the environment with high
temperature, high humidity or more dust etc.
z Checking items
Please check the following items for the criterion. If the item does not conform to the criterion, please
improve the surrounding environment, retighten the screw etc. to make it conform to the criterion.
Checking Items Checking Contents Criterion Checking Method
Supply voltage Voltage fluctuation at
power terminal
Allowable voltage
fluctuation range
(DC24V, -15% to +15%)
Multimeter
Surrounding environment
state
Ambient temperature
(temperature inside
operation panel)
0
~50 °C Thermometer
Ambient humidity
(humidity inside operation
panel)
10%
~90% RH(without
condensation)
Hygrometer
Dirt Without dirt Visual check
Oil mist sticking No oil penetrating into the
space between the front
panel and Unit box
Visual check
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