Humidity; Vibration And Shock; Atmosphere - Omron CJ2 User Manual

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Humidity

Rapid temperature changes can cause condensation to occur, resulting in malfunctioning due to short-
circuiting. When there is a possibility of this occurring, take measures against condensation, such as
leaving the PLC power ON at night or installing a heater in the control panel to keep it warmer.
Power ON
Examples of Measures against Condensation
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Vibration and Shock

The PLC is tested for conformity with the sine wave vibration test method (IEC 60068-2-6) and the
shock test method (IEC 60068-2-27) of the Environmental Testing for Electrotechnical Products. It is
designed so that malfunctioning will not occur within the specifications for vibration and shock. If, how-
ever, the PLC is to be used in a location in which it will be directly subjected to regular vibration or
shock, then implement the following countermeasures:
• Either separate the control panel from the source of the vibration or shock, or secure the PLC and the
panel with rubber padding to prevent vibration.
• Make the building or the floor vibration-resistant.
• To prevent shock during operation to devices in the panel, such as electromagnetic contactors,
secure either the source of the shock or the PLC with rubber padding.
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Atmosphere

Using the PLC in any of the following locations can cause defective contact with connectors and corro-
sion of components. Implement countermeasures such as purging the air as required.
• In locations exposed to dust, dirt, salt, metal filings, soot, or organic solvents, use a panel with an air-
tight structure. Be careful of temperature increases inside the panel.
• In locations exposed to corrosive gas, purge the air inside the panel to clear the gas and then pres-
surize the inside of the panel to prevent gas from entering from outside.
• In locations where flammable gas is present, either use an explosion-protected construction or do not
use the PLC.
CJ2 CPU Unit Hardware User's Manual
Control panel
Moisture absorber
PLC
Heater
5 Installation
5
5-41