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E54-CT1

Digital Temperature Controllers

OMRON Corporation 

Precautions for Correct Use

Service Life

1. Use the Temperature Controller within the following temperature

and humidity ranges:

Temperature: -10 to 55°C (with no icing or condensation)

Humidity: 25% to 85%

If the Controller is installed inside a control board, the ambient

temperature must be kept to under 55°C, including the

temperature around the Controller.

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

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 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.

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

(E5CN-U: Front panel: Equivalent to IP50, rear case: IP20,

terminals: 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.) Avoid using the

Controller in places near a radio, television set, or wireless

installing.

4. These devices can cause radio disturbances which adversely

affect the performance of the Controller.

Mounting

Terminal Cover

(order separately)

Mounting Adapter

(Accessory)

Order the P2CF-11 or P3GA-11

Socket separately.

Waterproof packing

Panel

E5CN

E5CN-U

Front-mounting Socket

(Panel mounting is also possible.)

Mounting to a Panel

1. To mount the Controller so that it is waterproof, insert the

waterproof packing onto the Controller. Group mounting does not

allow waterproofing. The waterproof packing is not required if

waterproofing is not necessary.

The Panel Mounting Adapter is also included with the E5CN-U.

Waterproof packing is not included with the E5CN-U.

2. Insert the E5CN/E5CN-U into the mounting hole in the panel.

3. Push the adapter along the Controller body from the terminals up

to the panel, and fasten it temporarily.

4. Tighten the two fixing screws on the adapter. Alternately tighten

the two screws a little at time to keep them balanced. Tighten

them to a torque of 0.29 to 0.39 N·m.

Attaching the Terminal Cover

Make sure that the “UP” letters on the E5CN are at the top and insert

the terminal cover into the holes at the top and bottom of the

Controller.

Removing the Controller from the Case

When carrying out maintenance on the Controller, the Controller can

be removed from the case with the terminal leads still attached. The

Controller can be removed from the case only with the E5CN. It

cannot be removed with the E5CN-U.

Tool insertion hole

Flat-blade screwdriver

(Unit: mm)

(1)

ALM1

ALM2

ALM3

(3)

HA

PV

OUT1

OUT2

STOP

CMW

MANU

SV

(2)

(1)

E5CN

1. Insert the tool into the slots (one on the top and one on the

bottom) and release the hooks.

2. Insert the tool into the gap between the front panel and rear case

and pull out the front panel slightly. Hold both sides of the front

panel and draw out the Controller towards you. Do not apply

unnecessary force.

3. Before inserting the Controller, confirm that the sealing rubber is

in place. Insert the Controller into the rear case until you hear a

click. Press on the hooks on the top and bottom of the rear case

to be sure that the hooks are securely locked in place.Be sure

that electronic parts do not come in contact with the case.

22

Digital Temperature Controllers E5CN/E5CN-U

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