SF2D-DC5V datasheet(5/5 Pages) NAIS

Part #	SF2D-DC5V

Description	POLARISED, MONOSTABLE SAFETY RELAY

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Manufacturer	NAIS [Nais(Matsushita Electric Works)]

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NOTES

1. Coil operating power

Pure DC current should be applied to the

coil.The wave form should be rectangular.

If it includes ripple, the ripple factor should

be less than 5%. However, check it with

the actual circuit since the characteristics

may be slightly different.

2. Coil connection

When connecting coils, refer to the wiring

diagram to prevent mis-operation or

malfunction.

3. Cleaning

For automatic cleaning, the boiling

method is recommended. Avoid ultrasonic

cleaning which subjects the relays to high

frequency vibrations, which may cause

the contacts to stick.

It is recommended that a ﬂuorinated

hydrocarbon or other alcoholic solvents

be used.

4. Soldering

We recommend the following soldering

conditions

1) Automatic soldering

1) Preheating: 100°C 212°F, max. 60 s

2) Soldering: 250°C 482°F, max. 5 s

5. Others

1) If the relay has been dropped, the

appearance and characteristics should

always be checked before use.

2) The cycle lifetime is deﬁned under the

standard test condition speciﬁed in the

JIS* C 5442-1986 standard (temperature

15 to 35°C 59 to 95°F, humidity 25 to

85%). Check this with the real device as it

is affected by coil driving circuit, load type,

activation frequency, activation

phase,ambient conditions and other

factors.

Also, be especially careful of loads such

as those listed below.

(1) When used for AC load-operating and

the operating phase is synchronous.

Rocking and fusing can easily occur due

to contact shifting.

(2) High-frequency load-operating

When high-frequency opening and

closing of the relay is performed with a

load that causes arcs at the contacts,

nitrogen and oxygen in the air is fused by

the arc energy and HNO3 is formed. This

can corrode metal materials.

Three countermeasures for these are

listed here.

1. Incorporate an arc-extinguishing

circuit.

2. Lower the operating frequency

3. Lower the ambient humidity

3) For secure operations, the voltage

applied to the coil should be nominal

voltage. In addition, please note that pick-

up and drop-out voltage will vary

according to the ambient temperature and

operation conditions.

4) Heat, smoke, and even a ﬁre may occur

if the relay is used in conditions outside of

the allowable ranges for the coil ratings,

contact ratings, operating cycle lifetime,

and other speciﬁcations. Therefore, do

not use the relay if these ratings are

exceeded. Also, make sure that the relay

is wired correctly.

5) Incorrect wiring may cause unexpected

events or the generation of heat or ﬂames.

6) Check the ambient conditions when

storing or transporting the relays and

devices containing the relays. Freezing or

condensation may occur in the relay,

causing functional damage. Avoid

subjecting the relays to heavy loads, or

strong vibration and shocks.

6. Usage, transport and storage

conditions

1) Ambient temperature, humidity, and

atmospheric pressure during usage,

transport, and storage of the relay:

(1) Temperature:

–40 to +70°C –40 to +158°F

(2) Humidity: 5 to 85% RH

(Avoid freezing and condensation.)

The humidity range varies with the

temperature. Use within the range

indicated in the graph below.

(3) Atmospheric pressure: 86 to 106 kPa

Temperature and humidity range for

usage, transport, and storage:

2) Condensation

Condensation forms when there is a

sudden change in temperature under high

temperature and high humidity conditions.

Condensation will cause deterioration of

the relay insulation.

3) Freezing

Condensation or other moisture may

freeze on the relay when the

temperatures is lower than 0°C 32°F. This

causes problems such as sticking of

movable parts or operational time lags.

4) Low temperature, low humidity

environments

The plastic becomes brittle if the relay is

exposed to a low temperature, low

humidity environment for long periods of

time.

Tolerance range

(Avoid

condensation when

used at temperatures

higher than 0

°C 32°F)

(Avoid freezing when

used at temperatures

lower than 0

°C 32°F)

85

5

–40

0

+32

+70

+158

Temperature,

°C °F

Humidity, %R.H.

2/19/2003

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