Omron E5GN Manual page 18

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 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.
11. When executing self-tuning, turn ON power to the load (e.g.,
heater) at the same time as or before supplying power to the
product. If power is turned ON to the product before turning ON
power to the load, self-tuning will not be performed properly and
optimum control will not be achieved.
12. A switch or circuit breaker must be provided close to the product.
The switch or circuit breaker must be within easy reach of the
operator, and must be marked as a disconnecting means for this
unit.
13. Always turn OFF the power supply before pulling out the interior
of the product, and never touch nor apply shock to the terminals
or electronic components. When inserting the interior of the
product, do not allow the electronic components to touch the
case.
14. Do not use paint thinner or similar chemical to clean with. Use
standard grade alcohol.
15. Design the system (e.g., control panel) considering the 2
seconds of delay that the product's output to be set after power
ON.
16. The output may turn OFF when shifting to certain levels. Take
this into consideration when performing control.
17. The EEPROM has a limited write life. When overwriting data
frequently, e.g., via communications, use RAM Mode.
Precautions for Correct Use
Service Life
1. Use the product within the following temperature and humidity
ranges:
Temperature: − 10 to 55 ° C (with no icing or condensation)
Humidity: 25% to 85%
If the product is installed inside a control board, the ambient
temperature must be kept to under 55 ° C, including the
temperature around the product.
2. The service life of electronic devices like Temperature 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 Temperature Controller.
3. When two or more Temperature 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
2
).
Temperature 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 Temperature Controllers. When
providing forced cooling, however, be careful not to cool down the
terminals sections alone to avoid measurement errors.
Measurement Accuracy
1. When extending or connecting the thermocouple lead wire, be
sure to use compensating wires that match the thermocouple
types.
2. 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.
3. Mount the product so that it is horizontally level.
4. If the measurement accuracy is low, check to see if input shift has
been set correctly.
Waterproofing
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: NEMA4X for indoor use (equivalent to IP66)
Rear case: IP20, Terminal section: IP00
Operating Precautions
1. It takes approximately two seconds for the outputs to turn ON
from after the power supply is turned ON. Due consideration must
be given to this time when incorporating Temperature Controllers
in a sequence circuit.
2. When using self-tuning, turn ON power for the load (e.g., heater)
at the same time as or before supplying power to the Temperature
Controller. If power is turned ON for the Temperature Controller
before turning ON power for the load, self-tuning will not be
performed properly and optimum control will not be achieved.
3. When starting operation after the Temperature Controller has
warmed up, turn OFF the power and then turn it ON again at the
same time as turning ON power for the load. (Instead of turning
the Temperature Controller OFF and ON again, switching from
STOP mode to RUN mode can also be used.)
Digital Temperature Controllers
E5GN
17