Omron DeviceNet Communications Unit E5ZN-DRT User Manual

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14. In order that power can be turned OFF in an emergency by

the person operating the Temperature Controller, install the
appropriate switches and circuit breakers, and label them
accordingly.

15. Turn OFF the power before drawing out the Temperature

Controller body. Do not touch or apply excessive force to the
terminals or electronic parts. When inserting the body, make
sure that electronic parts do not come in contact with the
case.

16. When the terminal block for the E5GN is detached, do not

touch or apply excessive force to any electronic parts.

17. Use alcohol to clean the Temperature Controller. Do not use

thinner or other solvent-based substances.

18. Inverters with an output frequency of 50/60 Hz are available,

but they may cause the internal temperature of Temperature
Controller to rise, possibly resulting in smoke or burning. Do
not use an inverter output to supply power to a Temperature
Controller.

● Service Life

1. Use the Temperature Controller within the specified temperature

and humidity ranges. If the product is installed inside a control
panel, the temperature around the Temperature Controller and
not the temperature around the control panel must be kept within
the specified temperature range.

2. The service life of electronic devices such as Temperature

Controllers is determined not only by the number of switching
operations performed by the relay, but also by the service life
of the internal electronic components. The service life of
these components depends on the ambient temperature: it
will be shorter if the ambient temperature is high and longer if
the ambient temperature is low. For this reason, the service
life of the product can be extended by keeping the internal
temperature of the Temperature Controller low.

3. If several Temperature Controllers are mounted side-by-side

or are arranged vertically, the heat generated by them may
cause the internal temperature of the products to rise, thus
reducing their service life. To prevent this, take steps to
ensure that the Temperature Controllers are cooled, such as
installing fans. When providing forced cooling, however, be
careful not to cool down the terminal sections alone to avoid
measurement errors.

● Measurement Accuracy

1. When extending the lead wires for thermocouples, use a com-

pensating conductor appropriate for the type of thermocouple
use.

2. When extending the lead wires for platinum resistance ther-

mometers, use lead wires with low resistance, and make the
resistance in the 3 lead wires equal.

3. The type of Temperature Sensor and the input type for the

Temperature Controller must be set the same.

4. There are two types of platinum resistance thermometers: Pt

and JPt. Accurate measurement will not be possible if the
input type for the Temperature Sensor is not set correctly.

5. Mount the Temperature Controller horizontally.
6. If significant errors occur, check to see if the input shift has

been set correctly.

● Waterproofing

Sections without any specification on their degree of protection or
those with IP

@0 specifications are not waterproof.

● EN/IEC Compliance

Installing the following fuse in the power supply terminal block is rec-
ommended if the Temperature Controller is used in applications
requiring EN/IEC compliance.
Recommended fuse: A T2A, 250-VAC, time lag fuse with low break-
ing capacity

● Operating Precautions

1. It takes approximately five seconds for the outputs to turn ON

from the moment the power is turned ON. Due consideration
must be given to this time when incorporating Temperature Con-
trollers in a sequence circuit.

2. When using the self-tuning capability of the E5

@N, E5@K, or

@J, supply power to the load (e.g., heater) at the same

time as or before supplying power to the Temperature Con-
troller. 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.
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 in
this case.)

3. The reception of the Temperature Controller may be affected

if it is used close to radios, television sets or wireless
devices.

Precautions for Correct Use

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