F39-EU1E Omron, F39-EU1E Datasheet - Page 51

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➌-➁-11 Using DC-operated Relays

For a DC-operated Relay power supply, use a power supply with a

maximum ripple percentage of 5%. An increase in the ripple

percentage will cause humming.

➌-➁-12 Using DC-operated Relays

To make the correct connections, first check the individual terminal

numbers and applied power supply polarities provided in this catalog.

If the polarity is connected in reverse for the coil power supply when

Relays with surge suppressor diodes or Relays with operation

indicators are used, it can cause problems such as Relay

malfunctioning, damage to diodes, or failure of indicators. Also, for

Relays with diodes, it can cause damage to devices in the circuit due

to short-circuiting.

Polarized Relays that use a permanent magnet in a magnetic circuit

will not operate if the power supply to the coil is connected in reverse.

➌-➁-13 Using DC-operated Relays

If insufficient voltage is applied to the coil, either the Relay will not

operate or operation will be unstable. This will cause problems such

as a drop in the electrical durability of the contacts and contact

welding.

In particular, when a load with a large surge current, such as a large

motor, is used, the voltage applied to the coil may drop when a large

inrush current occurs to operate the load as the power is turned ON.

Also, if a Relay is operated while the voltage is insufficient, it will

cause the Relay to malfunction even at vibration and shock values

below the specifications specified in the specification sheets and this

catalog. Therefore, be sure to apply the rated voltage to the coil.

➂ Mounting Design

➌-➂-1 Lead Wire Diameters

Lead wire diameters are determined by the size of the load current.

As a standard, use lead wires at least the size of the cross-sectional

areas shown in the following table. If the lead wire is too thin, it may

cause burning due to abnormal heating of the wire.

➌-➂-2 When Sockets are Used

Check Relay and socket ratings, and use devices at the lower end of

the ratings. Relay and socket rated values may vary, and using

devices at the high end of the ratings can result in abnormal heating

and burning at connections.

➌-➂-3 Mounting Direction

Depending on the model, a particular mounting direction may be

specified. Check this catalog and then mount the device in the correct

direction.

Ripple percentage %=

Permissible current (A)

(1) Input Power Supply Ripple

(2) Coil Polarity

(3) Coil Voltage Insufficiency

Emax−Emin

Emin

Emean

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

Emax

× 100%

Emean

Smoothing

capacitor

E max.= Maximum value of ripple component

E min.= Minimum value of ripple component

E mean= Mean value of DC component

Ripple component

Cross-sectional area (mm

DC component

Relay

0.75

1.25

3.5

)

➌-➂-4 When Devices Such as Microcomputers are in

If a device that is susceptible to external noise, such as a

microcomputer, is located nearby, take noise countermeasures into

consideration when designing the pattern and circuits. If Relays are

driven using a device such as a microcomputer, and a large current is

switched by Relay contacts, noise generated by arcing can cause the

microcomputer to malfunction.

➍ Operating and Storage

➍-1 Operating, Storage, and Transport

During operation, storage, and transport, avoid direct sunlight and

maintain room temperature, humidity, and pressure.

➍-2 Operating Atmosphere

➍-3 Using Relays in an Atmosphere Containing Corrosive

Do not use Relays in a location where silicon gas, sulfuric gas (SO

or H

If Relays are stored or used for a long period of time in an atmosphere

of sulfuric gas or organic gas, contact surfaces may become corroded

and cause contact instability and obstruction, and terminal soldering

characteristics may be degraded.

Also, if Relays are stored or used for a long period of time in an

atmosphere of silicon gas, a silicon film will form on contact surfaces,

causing contact failure.

The effects of corrosive gas can be reduced by the processing shown

in the following table.

Outer case, housing

PCB, copper plating

Connectors

If Relays are used or stored for a long period of time in an

atmosphere of high temperature and humidity, oxidation and

sulphurization films will form on contact surfaces, causing

problems such as contact failure.

If the ambient temperature is suddenly changed in an atmosphere

of high temperature and humidity, condensation will develop inside

of the Relay. This condensation may cause insulation failure and

deterioration of insulation due to tracking (an electric phenomenon)

on the surface of the insulation material.

Also, in an atmosphere of high humidity, with load switching

accompanied by a comparatively large arc discharge, a dark green

corrosive product may be generated inside of the Relay. To

prevent this, it is recommended that Relays be used in at low

humidity.

If Relays are to be used after having been stored for a long period,

first inspect the power transmission before use. Even if Relays are

stored without being used at all, contact instability and obstruction

may occur due to factors such as chemical changes to contact

surfaces, and terminal soldering characteristics may be degraded.

Do not use Relays in an atmosphere containing flammable or

explosive gas. Arcs and heating resulting from Relay switching

may cause fire or explosion.

Do not use Relays in an atmosphere containing dust. The dust will

get inside the Relays and cause contact failure.

Environments

Gas (Silicon, Sulfuric, or Organic Gas)

S), or organic gas is present.

Proximity

Item

Seal structure using packing.

Apply coating.

Apply gold plating or rhodium

plating.

Precautions for All Relays

Processing

C-9

F39-EU1E Omron, F39-EU1E Datasheet - Page 51

F39-EU1E

Specifications of F39-EU1E

Related parts for F39-EU1E