F39-EU1E Omron, F39-EU1E Datasheet - Page 606

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Switch Operation

Note: An inductive load causes a problem especially in DC circuitry.

Mechanical Conditions for Switch Selection

Electrical Characteristics for Switch Selection

Electrical Conditions

The Switch in actual operation may cause accidents that cannot be

foreseen from the design stage. Therefore, the Switch must be

practically tested before actual use.

When testing the Switch, be sure to apply the actual load

conditions together with the actual operating environment.

All the performance ratings in this catalog are provided under the

following conditions unless otherwise specified.

Inductive load:A minimum power factor of 0.4 (AC) or a

Lamp load:

Motor load:

1. Ambient temperature: 5 C to 35 C

2. Ambient humidity:

An Actuator suitable for the operating method must be selected.

Ask your OMRON representative for details.

Check the operating speed and switching frequency.

1. If the operating speed is extremely low, switching of the

2. If the operating speed is extremely high, the Switch may break

Do not impose excessive force on the Actuator, otherwise the

Actuator may become damaged or not operate correctly.

Make sure that the stroke is set within the suitable range specified

for the model, or otherwise the Switch may break.

The switching load capacity of the Switch greatly varies between

AC and DC. Always be sure to apply the rated load. The control

capacity will drastically drop if it is a DC load. This is because a DC

load has no current zero-cross point, unlike an AC load. Therefore,

if an arc is generated, it may continue comparatively for a long

time. Furthermore, the current direction is always the same, which

results in contact relocation, whereby the contacts easily stick to

each other and do not separate when the surfaces of the contacts

are uneven.

movable contact will become unstable, thus resulting in

incorrect contact or contact welding.

due to shock. If the switching frequency is high, the switching of

the contacts cannot keep up with the switching frequency. Make

sure that the switching frequency is within the rated switching

frequency.

Therefore, it is essential to know the time constants (L/R) of the

load.

(A)

Precautions for Correct Use

maximum time constant of 7 ms (DC)

An inrush current 10 times higher than the

normal current

An inrush current 6 times higher than the

normal current

http://www.ia.omron.com/

Solenoids

(Approximately 10 to 20 times higher)

Incandescent

lamps (Approximately 10 to 15 times

higher)

40% to 70%.

Motors

(Approximately

5 to 10 times

higher)

Relays

(Approxi-

mately 4 to 5

times higher)

Connections

Power Connection Examples

(Connection of Different Polarities)

Connect the load to the same polarities.

If the load is inductive, counter-electromotive voltage will be

generated. The higher the voltage is, the higher the generated

energy will be, which will increase the abrasion of the contacts and

contact relocation load conditions. Be sure to use the Switch within

the rated conditions.

If the load is a minute voltage or current load, use a Switch

designed for minute loads. The reliability of silver-plated contacts,

which are used by standard Switches, will be insufficient if the load

is a minute voltage or current load.

With a Za contact form, do not contact a single Switch to two power

supplies that are different in polarity or type.

Do not use a circuit that will short-circuit if a fault occurs, otherwise

the charged part may melt and break off.

Application of Switch to a Low-voltage, Low-current Electronic

Circuit.

1. If bouncing or chattering of the contacts results and causes

2. Conventional silver-plated contacts are not suitable for this

3. The contacts of the Switch used for an emergency stop must be

To protect the Switch from damage due to short-circuits, be sure to

connect in series a quick-response fuse with a breaking current 1.5

to 2 times larger than the rated current to the Switch. When

complying with EN certified ratings, use a 10-A IEC 60269-

compliant gI or gG fuse.

Incorrect

Correct

problems, take the following countermeasures.

(a) Insert an integral circuit.

(b) Suppress the generation of pulses from the contact bouncing

application, in which particularly high reliability is required. Use

gold-plated contacts, which are ideal for handling minute

voltage or current loads.

normally closed with a positive opening mechanism.

or chattering of the contacts so that it is less than the noise

margin of the load.

Incorrect

Precautions for All Switches

Incorrect Power Connection

Example

(Connection of Different Power

Supplies)

There is a risk of AC and DC mixing.

Incorrect

C-4

F39-EU1E Omron, F39-EU1E Datasheet - Page 606

F39-EU1E

Specifications of F39-EU1E

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