Installation Precautions - Omron E5C User Manual

Installation Precautions

Service Life
Use the Digital Controller within the following temperature and humidity ranges:
Temperature: −10 to 55°C (with no icing or condensation), Humidity: 25% to 85%
If the Digital Controller is installed inside a control board, the ambient temperature must be kept to
under 55°C, including the temperature around the Controller.
The service life of electronic devices like Digital Controllers is determined not only by the number of
times the relay is switched but also by the service life of internal electronic components. Component
service life is affected by the ambient temperature: the higher the temperature, the shorter the
service life and, the lower the temperature, the longer the service life. Therefore, the service life can
be extended by lowering the temperature of the Digital Controller.
When two or more Digital Controllers are mounted horizontally close to each other or vertically next
to one another, the internal temperature will increase due to heat radiated by the Digital Controllers
and the service life will decrease. In such a case, use forced cooling by fans or other means of air
ventilation to cool down the Digital Controllers. When providing forced cooling, however, be careful
not to cool down the terminals sections alone to avoid measurement errors.
Ensuring Measurement Accuracy
When extending or connecting the thermocouple lead wire, be sure to use compensating wires that
match the thermocouple types.
When extending or connecting the lead wire of the platinum resistance thermometer, be sure to use
wires that have low resistance and keep the resistance of the three lead wires the same.
Mount the Digital Controller so that it is horizontally level.
If the measurement accuracy is low, check to see if input shift has been set correctly.
Resistance to Water (E5CC/E5EC/E5AC Only)
The degree of protection is as shown below. Sections without any specification on their degree of
protection or those with IP@0 are not waterproof.
Front panel: IP66
Rear case: IP20, Terminal section: IP00
When waterproofing is required, insert the Waterproof Packing on the backside of the front panel.
Keep the Port Cover on the front-panel Setup Tool port of the E5EC/E5AC securely closed. The
degree of protection when the Waterproof Packing is used is IP66. To maintain an IP66 degree of
protection, the Waterproof Packing and the Port Cover for the front-panel Setup Tool port must be
periodically replaced because they may deteriorate, shrink, or harden depending on the operating
environment. The replacement period will vary with the operating environment. Check the required
period in the actual application. Use 3 years or sooner as a guideline. If the Waterproof Packing and
Port Cover are not periodically replaced, waterproof performance may not be maintained. If a
waterproof structure is not required, then the Waterproof Packing does not need to be installed.
E5@C Digital Temperature Controllers User's Manual (H174)
Installation Precautions
9