Installation Precautions - Omron E5CC User Manual

Installation Precautions

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.
Ambient Noise
To avoid inductive noise, keep the wiring for the Digital Controller's terminal block wiring away from
power cables carrying high voltages or large currents. Also, do not wire power lines together with or
parallel to Digital Controller wiring. Using shielded cables and using separate conduits or ducts is
recommended.
Attach a surge suppressor or noise filter to peripheral devices that generate noise (in particular,
motors, transformers, solenoids, magnetic coils or other equipment that have an inductance compo-
nent). When a noise filter is used at the power supply, first check the voltage or current, and attach
the noise filter as close as possible to the Digital Controller.
Allow as much space as possible between the Digital Controller and devices that generate powerful
high frequencies (high-frequency welders, high-frequency sewing machines, etc.) or surge.
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.
10 E5@C Digital Temperature Controllers User's Manual (H174)