QJ71C24N-R2 datasheet(21/24 Pages) OMRON

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EJ1

Precautions for Correct Use

Installation

1. Do not connect the End Unit directly to an HFU.

2. Connect the End Unit to the right side of a Basic Unit.

3. Connect the HFU to the left side of the Basic Units.

4. The Temperature Controller cannot be used as a CJ-series Unit.

5. Use the EJ1G-

@@ for gradient temperature control. When not

using gradient temperature control, use the EJ1N-

@@.

6. When removing the terminal block to replace a Unit, be sure that

the new Unit is the same as the Unit that is being replaced.

Service Life

1. Use the product within the following temperature and humidity

ranges:

Temperature:

−10°C to 55°C (with no condensation or icing)

Humidity:

25% to 85%

When the Temperature Controller is incorporated in a control

panel, make sure that the controller's ambient temperature and not

the panel's ambient temperature does not exceed 55°C.

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. Mounting two or more Temperature Controllers side by side, or

mounting Temperature Controllers above each other may cause

heat to build up inside the Temperature Controllers, which will

shorten their service life. If the Temperature Controllers are

mounted above each other or side by side, use forced cooling by

fans or other means of air ventilation to cool down the

Temperature Controllers.

However, be sure not to cool only the terminals. Doing so will

result in measurement errors.

Ensuring 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 Temperature Controller so that it is horizontally level.

4. If the measurement accuracy is low, check to see if input shift has

been set correctly.

Precautions for Operation

1. A certain amount of time is required for the outputs to turn ON from

the time the power supply is turned ON. Due consideration must

be given to this time when incorporating Temperature Controllers

in a sequence circuit.

2. It takes 30 minutes from the time the Temperature Controller is turned

ON until the current temperature is displayed. Always turns ON the

power supply at least 30 minutes before starting temperature control.

3. Avoid using the Temperature Controller near a radio, television set, or

other wireless device. Its use would result in reception disturbance.

Wiring Screw-Less Clamp Terminals

There are two holes for each terminal. The

hole on the right is the operation hole and the

hole on the left is the wire hole.

Insert a flat-blade screwdriver with a width of

2.5 mm into the operation hole, insert the wire

into the wire hole, and then remove the

screwdriver. The wire will be clamped.

Use pin terminals that are suitable for the

cross-sectional area of the wire.

Recommended pin terminals:

Weidmuller H-sleeve series

Installation

Connecting Units

1. Align the connectors and connect the Units to each other. Connect

an End Unit to the Unit on the right end.

Note: 1. Do not connect the End Unit directly to an HFU.

2. Connect the End Unit to the right side of a Basic Unit.

2. Slide the yellow sliders on the top and bottom of the Units until they

click into place.

3. Attach the cover seal to the connector opening on the Unit on the

left end of the EJ1.

Removing the Terminal Block

1. Press down the terminal block lever.

2. Pull out the terminal block.

B10

A10

Slider

Lock

Cover Seal

Lower the lever.

Pull out.

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