Omron E5C series, User Manual

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7
Precautions for Safe Use
E5@C Digital Temperature Controllers User’s Manual (H174)
Precautions for Safe Use
Be sure to observe the following precautions to prevent operation failure, malfunction, or adverse
affects on the performance and functions of the product. Not doing so may occasionally result in unex-
pected events. Do not handle the Digital Controller in ways that exceed the ratings.
• The product is designed for indoor use only. Do not use or store the product outdoors or in any of the
following places.
Places directly subject to heat radiated from heating equipment.
Places subject to splashing liquid or oil atmosphere.
Places subject to direct sunlight.
Places subject to dust or corrosive gas (in particular, sulfide gas and ammonia gas).
Places subject to intense temperature change.
Places subject to icing and condensation.
Places subject to vibration and large shocks.
• Use and store the Digital Controller within the rated ambient temperature and humidity.
Gang-mounting two or more Digital Controllers, or mounting Digital Controllers above each other may
cause heat to build up inside the Digital Controllers, which will shorten their service life. In such a
case, use forced cooling by fans or other means of air ventilation to cool down the Digital Controllers.
• To allow heat to escape, do not block the area around the Digital Controller. Do not block the
ventilation holes on the Digital Controller.
• Be sure to wire properly with correct polarity of terminals.
• Use the specified size of crimped terminals (M3, width of 5.8 mm or less) to wire the E5CC, E5EC,
E5AC, or E5DC. To connect bare wires to the terminal block of the E5CC, E5EC, E5AC, or E5DC, use
copper braided or solid wires with a gage of AWG24 to AWG18 (equal to a cross-sectional area of
0.205 to 0.8231 mm
2
). (The stripping length is 6 to 8 mm.) Up to two wires of the same size and type,
or two crimped terminals can be inserted into a single terminal.
Use the specified size of crimped terminals (M3.5, width of 7.2 mm or less) to wire the E5CC-U. To
connect bare wires to the terminal block of the E5CC-U, use copper braided or solid wires with a
gage of AWG24 to AWG14 (equal to a cross-sectional area of 0.205 to 2.081 mm
2
). (The stripping
length is 5 to 6 mm.) Up to two wires of the same size and type, or two crimped terminals, can be
inserted into a single terminal.
• Do not wire the terminals that are not used.
• To avoid inductive noise, keep the wiring for the Digital Controller's terminal block away from power
cables that carry 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
component).
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.
• Use the Digital Controller within the rated load and power supply.
• Make sure that the rated voltage is attained within 2 seconds of turning ON the power using a switch
or relay contact. If the voltage is applied gradually, the power may not be reset or output malfunctions
may occur.
• Make sure that the Digital Controller has 30 minutes or more to warm up after turning ON the power
before starting actual control operations to ensure the correct temperature display.