H7CN
8
Safety Precautions
●
Be sure to read the precautions for all Counters in the website at: http://www.ia.omron.com/.
Warning Indications
Meaning of Product Safety Symbols
!CAUTION
•Make sure the proper product is specified for the application.
•For correct use, do not subject the product to the following
conditions.
•Dramatic temperature fluctuations
•High humidity or where condensation may occur
•Severe vibration and shock
•Where excessive dust, corrosive gas, or direct sunlight may be
present
•This product is not waterproof or oil resistance. Do not use the
product in any of the places subject to splashing liquid or oil
atmosphere.
•Use and store the product within the rated ranges given for the
product model you are using. If necessary, use forced cooling.
If the product is stored below −10°C, allow it to warm up for three
hours at room temperature before turning ON the power supply.
•Do not cover the vent holes on the products and the area around
the product in order to ensure thermal dissipation.
•Wiring all terminals correctly.
•Do not wire the terminals which are not used.
•Use specified size crimped terminals (M3.5, thickness 7.2mm
max.) for wiring with a gage of AWG 24 to AWG 18 (equal to a
cross section area of 0.205 to 0.823mm2).
(The wiring stripping length is 5 to 6mm.)
Up to two wires of same size and type, or two crimped terminals
can be inserted into a single terminal.
•Use this product within the rated power supply voltage and control
output.
•Use a switch, relay, or other contact to turn the power supply ON
instantaneously. If the voltage is applied gradually, the power may
not be reset or output malfunctions may occur.
•Do not apply the supply voltage directly from external to transistor
output.
•Interlock the power to the product with a relay so that the product
will not be left in an output on condition for long periods. Leaving
the product in an output-on condition for a month or longer,
especially in places with high temperatures, may result in
deterioration to internal parts, such as an electrolytic capacitor.
•A constant reading system is used in the present counter, so
settings can be changed while power is being supplied, but the
output will turn ON if the set value is set to the current
measurement value.
•When changing the set count while power is being supplied, an
inadequate push of the thumb wheel switches will display two
numbers in one display window, causing the operating count to drift
widely. Therefore, press the thumb wheel switches surely.
•Internal circuit voltage (5 V) is output to the no-
voltage input terminals, which may cause some
connected devices to malfunction or fail. Check the
specifications of the input device (e.g., rated output
voltage or whether a power supply circuit diode is
built in).
To prevent power supply devices from being subjected to charging
accidents, connect a diode as in the diagram figure when using a
power supply voltage of 5 V or less to operate input devices that do
not have a diode built into the power supply circuit.
•Check that the LED indicators are operating normally. Depending
on the operating environment, the indicators and plastic parts may
deteriorate faster than expected, causing the indicators to fail.
Periodically perform inspections and replacements.
•Use tools when separating parts for disposal.
•When disposing of the product, observer all local ordinances as
they apply.
CAUTION
Indicates a potentially hazardous
situation which, if not avoided, may
result in minor or moderate injury or in
property damage.
Precautions for
Safe Use
Supplementary comments on what to
do or avoid doing, to use the product
safely.
Precautions for
Correct Use
Supplementary comments on what to
do or avoid doing, to prevent failure to
operate, malfunction or undesirable
effect on product performance.
Used to warn of the risk of electric shock under
specific conditions.
Used for general prohibitions for which there is no
specific symbol.
Used for general mandatory action precautions
for which there is no specified symbol.
Do not touch the terminals while power is being supplied.
Doing so may occasionally result in minor injury due to
electric shock.
Do not use the product where subject to flammable or
explosive gas. Otherwise, minor injury from explosion
may occasionally occur.
Never disassemble, modify or repair the product or touch
any of the internal parts. Minor electric shock, fire, or
malfunction may occasionally occur.
The life expectancy of output relays varies considerably
with the output load and switching conditions. Always
consider the application conditions and use the output
relays within their rated load and electrical life
expectancy. If the output relays are used past their life
expectancy, contact fusing or burning may occasionally
occur. Also, never exceed the rated load current. When
using a heater, surely use a thermo switch in the load
circuit.
Tighten the screws to between 0.74 and 0.90 N⋅m. Loose
screws may occasionally result in fire.
Do not allow pieces of metal, wire clippings, or fine
metallic shavings from installation to enter the product.
Doing so may occasionally result in electric shock, fire, or
malfunction.
Precautions for Safe Use
Sensor
Input
0V