Safety Precautions; Precautions For Safe Use - Omron E5CN Datasheet

Safety Precautions

!CAUTION
Do not touch the terminals while power is being supplied.
Doing so may occasionally result in minor injury due to
electric shock.
Do not allow pieces of metal, wire clippings, or fine
metallic shavings or filings from installation to enter the
product. Doing so may occasionally result in electric
shock, fire, or malfunction.
Do not use the product where subject to flammable or
explosive gas. Otherwise, minor injury from explosion
may occasionally occur.
Do not leave the cable for the Support Software
connected to the product. Malfunction may occur due to
noise in the cable.
Do not use the Temperature Controller or Conversion
Cable if it is damaged. Doing so may occasionally result
in minor electric shock or fire.
Never disassemble, modify, or repair the product or touch
any of the internal parts. Minor electric shock, fire, or
malfunction may occasionally occur.
CAUTION - Risk of Fire and Electric Shock
a) This product is UL listed as Open Type Process
Control Equipment. It must be mounted in an
enclosure that does not allow fire to escape externally.
b) More than one disconnect switch may be required to
de-energize the equipment before servicing the
product.
c) Signal inputs are SELV, limited energy. ✽1
d) Caution: To reduce the risk of fire or electric shock, do
not interconnect the outputs of different Class 2
circuits. ✽2
If the output relays are used past their life expectancy,
contact fusing or burning may occasionally occur.
Always consider the application conditions and use the
output relays within their rated load and electrical life
expectancy. The life expectancy of output relays varies
considerably with the output load and switching
conditions.
Tighten the terminal screws to between 0.74 and
0.90 N·m. ✽3 Loose screws may occasionally result in
fire.
Set the parameters of the product so that they are
suitable for the system being controlled. If they are not
suitable, unexpected operation may occasionally result in
property damage or accidents.
A malfunction in the product may occasionally make
control operations impossible or prevent alarm outputs,
resulting in property damage. To maintain safety in the
event of malfunction of the product, take appropriate
safety measures, such as installing a monitoring device
on a separate line.
A semiconductor is used in the output section of long-life
relays. If excessive noise or surge is impressed on the
output terminals, a short-circuit failure is likely to occur. If
the output remains shorted, fire will occur due to
overheating of the heater or other cause. Take measures
in the overall system to prevent excessive temperature
increase and to prevent fire from spreading.
Do not allow pieces of metal or wire cuttings to get inside
the cable connector for the Support Software. Failure to
do so may occasionally result in minor electric shock, fire,
or damage to equipment.
Do not allow dust and dirt to collect between the pins in
the connector on the Conversion Cable. Failure to do so
may occasionally result in fire.
18
Basic-type Digital Temperature Controller
When inserting the body of the Temperature Controller
into the case, confirm that the hooks on the top and
bottom are securely engaged with the case. If the body of
the Temperature Controller is not inserted properly, faulty
contact in the terminal section or reduced water
resistance may occasionally result in fire or malfunction.
When connecting the Control Output Unit to the socket,
press it in until there is no gap between the Control Output
Unit and the socket. Otherwise contact faults in the
connector pins may occasionally result in fire or
malfunction.
✽1. An SELV circuit is one separated from the power supply with
double insulation or reinforced insulation, that does not exceed
30 V r.m.s. and 42.4 V peak or 60 VDC.
✽2. A class 2 power supply is one tested and certified by UL as having
the current and voltage of the secondary output restricted to
specific levels.
✽3. The tightening torque for E5CN-U is 0.5 N·m.

Precautions for Safe Use

Be sure to observe the following precautions to prevent malfunction
or adverse affects on the performance or functionality of the product.
Not doing so may occasionally result in faulty operation.
1. This product is specifically designed for indoor use only.
Do not use this product in 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.
2. Use and store the product within the rated ambient temperature
and humidity.
Gang-mounting two or more Temperature Controllers, or mounting
Temperature Controllers above each other may cause heat to build
up inside the Temperature 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 Temperature Controllers.
3. To allow heat to escape, do not block the area around the product.
Do not block the ventilation holes on the product.
4. Be sure to wire properly with correct polarity of terminals.
5. Use the specified size (M3.5, width 7.2 mm or less) crimped
terminals for wiring. To connect bare wires to the terminal block,
use stranded or solid copper wires with a gage of AWG24 to
AWG14 (equal to a cross-sectional area of 0.205 to 2.081 mm
(The stripping length is 5 to 6 mm.) Up to two wires of the same
size and type or two crimp terminals can be inserted into a single
terminal.
6. Do not wire the terminals that are not used.
7. To avoid inductive noise, keep the wiring for the product's terminal
block away from power cables carry high voltages or large
currents. Also, do not wire power lines together with or parallel to
product 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 product.
Allow as much space as possible between the product and devices
that generate powerful high frequencies (high-frequency welders,
high-frequency sewing machines, etc.) or surge.
8. Use this product within the rated load and power supply.
9. Make sure that the rated voltage is attained within two 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.
10.Make sure that the Temperature 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.
E5CN/E5CN-U
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