Digital Temperature Controllers

E5CN/E5CN-U

21

Precautions

Note: Refer to the ntlp: Electronic Temperature Controller Catalog (Cat. No. ntlp) for common precautions.

Note: 1. An SELV circuit is one separated from the power supply with

double insulation or reinforced insulation, that does not

exceed 30 V r.m.s. and 42.4 V peak or 60 VDC.

2. A class 2 power supply is one tested and certified by UL as

have the current and voltage of the secondary output

restricted to specific levels.

Precautions for Safe Use

1.

Do not use the Temperature Controller in the following locations.

• Locations exposed to radiated heat from heating devices

• Locations subject to exposure to water or oil

• Locations subject to direct sunlight

• Locations subject to dust or corrosive gas (especially sulfide gas

or ammonia gas).

• Locations subject to severe temperature changes

• Locations subject to icing or condensation

• Locations subject vibration or strong shock

2.

Use and store the Temperature Controller within the rated

ambient temperature and humidity. 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.

3.

Allow enough space around the Temperature Controller to

ensure proper heat dissipation. Do not block the ventilating

holes.

4.

Be sure to wire terminals properly using the correct polarity.

5.

Use crimp terminals with the specified dimensions (M3.5, width

7.2 mm max.).

into terminals must be 5 to 6 mm.

6.

Do not connect anything to unused terminals.

7.

Allow as much space as possible between the Controller and

devices that generate powerful high frequencies (high-frequency

welders, high-frequency sewing machines, etc.) or surge.

Keep the wiring for the Temperature Controller's terminal block

away from power cables carry high voltages or large currents.

Also, do not wire power lines together with or parallel to

Temperature Controller wiring.

8.

Use the Temperature Controller within a power supply voltage

and load that meet all specifications and ratings.

9.

Set up the power supply so that the voltage will reach the rated

voltage within 2 seconds after turning ON.

10. Allow at least 30 minutes for the Temperature Controller to warm

up.

11. 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.

12. Install the appropriate switches and circuit breakers and label

them accordingly so that power can be turned OFF in an

emergency by the person operating the Temperature Controller.

13. If you remove the Controller from its case, do not touch or apply

shock to the electronic parts inside. When placing the Controller

back in the case, make sure that electronic parts do not come in

contact with the case.

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

thinner or other solvent-based substances.

15. It will require 2 seconds for the outputs from the Temperature

Controller to stabilize after turning ON the power supply. Design

the system (e.g., the control panel) to allow for this time.

16. Outputs will turn OFF depending on the mode when switching to

the initial setting mode. Confirm system safety before switching

the mode.

Do not touch any of the terminals while the power is being

supplied. Doing so may occasionally result in minor

electric shock.

Do not allow pieces of metal or wire cuttings to get inside

the Temperature Controller. Failure to do so may

occasionally result in minor electric shock, fire, or

damage to equipment.

Do not use the Temperature Controller in locations

subject to flammable or explosive gas. Doing so may

occasionally result in minor injury due to explosion.

Do not attempt to disassemble, modify, or repair the

Temperature Controller or touch any internal

components. Doing so may occasionally result in minor

electric shock, fire, or damage to equipment.

Caution: Danger of Electric Shock

a) This Temperature Controller is UL-listed as an open-

type process controller. Use it in a control panel

structure so that fire will not leave the panel.

b) When using two or more cutoff switches, turn OFF all

switches so that no power is supplied to the

Temperature Controller before maintenance or

inspections.

c) Signal inputs are SELV restricted circuits. (See note 1.)

d) Caution: To reduce the danger of fire or electric shock,

do not internally connect the outputs of different class

2 circuits. (See note 2.)

If the output relay is used beyond its life expectancy, its

contacts may occasionally become fused or burned.

Always consider the actual application conditions and be

sure to use the output relay within its rated load and

electrical life expectancy. The life expectancy of the

output relay varies considerably according to its switching

capacity and operating conditions.

Fire may occasionally occur if terminal screws become

loose. Tighten the terminal screws using a torque

between 0.74 and 0.90 N·m.

Make settings for the Temperature Controller that are

suitable for the controlled system. Failure to do so may

result in unexpected operation occasionally resulting in

damage to equipment or personal injury.

Warning: To reduce the danger or electric shock or fire,

use the Temperature Controller in an controlled

environment relatively free from polluting materials.

Take appropriate safety measures, such as installing a

separate monitoring system, to ensure safe operation in

the event of a malfunction of the Temperature Controller.

Loss of operation control or alarm outputs due to

malfunction may occasionally result in physical damage

to the controlled system or equipment.

!CAUTION