●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.

●Please request for a specification sheet for detailed product data prior to the purchase.

●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.

2007.08.03 P0894EMDD03VOL03E

UC2/UD2 SERIES

13

NOTE ON CORRECT USE

1. Notes on contact load

Make sure that the contact load is within the specified range;

otherwise, the lifetime of the contacts will be shortened

considerably.

Note that the running performance shown is an example,

and that it varies depending on parameters such as the

type of load, switching

frequency, driver circuit, and

ambient temperature under the actual operating conditions.

Evaluate the performance by using the actual circuit before

using the relay.

2. Driving relays

- If the internal connection diagram of a relay shows + and -

symbols on the coil, apply the rated voltage to the relay in

the specified direction. If a rippled DC current source is

used, abnormalities such as beat at the coil may occur.

- The maximum voltage that can be applied to the coil of the

relay

varies depending on the ambient temperature.

Generally, the higher the voltage applied to the coil, the

shorter the operating time. Note, however, that a high

voltage also increases the bounce of the

contacts and

the contact opening and closing frequency, which may

shorten the lifetime of the contacts.

- If the driving voltage waveform of the relay coil rises and

falls gradually, the inherent performance of the relay may not

be fully realized. Make sure that the voltage waveform

instantaneously rises and falls as a pulse.

- For a latching relay, apply a voltage to the coil according to

the polarity specified in the internal connection diagram of

the relay.

- If a current is applied to the coil over a long period of time,

the coil temperature rises, promoting generation of organic

gas inside the relay, which may result in faulty contacts. In

this case, use of a latching relay is recommended.

- The operating time and release time indicate the time

required for each contact to close after the voltage has been

applied to or removed from the coil. However, because the

relay has a mechanical structure, a bounce state exists at

the end of the operating and release times. Furthermore,

because additional time is required until the contact

stabilizes after being in a high-resistance state, care must be

taken when using the relay at high speeds.

3. Operating environment

- Make sure that the relay mounted in the application set is

used within the specified temperature range. Use of a relay

at a temperature outside this range may adversely affect

insulation or contact performance.

- If the relay is used for a long period of time in highly humid

(RH 85% or higher) environment, moisture may be absorbed

into the relay. This moisture may react with the NOx and

SOx generated by glow discharges that occur when the

contacts are opened or closed, producing nitric or sulfuric

acid. If this happens, the acid produced may corrode the

metallic parts of the relay, causing operational malfunction.

-

and silicon based coating material) is used in the

neighborhood of relay, there is some possibility that these

materials will emit silicon gas that will penetrate the relay. In

this case, the switching contact may generate silicon

compounds on the surface of contacts. This silicon

compound may result in contact failure. Avoid use of relay in

such an environment.

- Because the

operating temperature range

varies

depending on the humidity, use the relay in the temperature

range illustrated in the figure below. Prevent the relay from

being frozen and avoid the generation of condensation.

- The relay maintains constant sealability under normal

atmospheric pressure (810 to 1,200 hpa). Its sealability may

be degraded or the relay may be deformed and malfunction

if it is used under barometric conditions exceeding the

specified range.

- The same applies when the relay is stored or transported.

Keep the upper-limit value of the temperature to which the

relay is exposed after it is removed from the carton box to

within 50°C.

- Permanent magnets are used in polarized relays. For this

reason, when magnets, transformers, or speakers are

located nearby the relay characteristics may change and

faulty operations may result.

- If excessive vibration or shock is applied to the relay, it may

malfunction and the contacts remain closed. Vibration or

shock applied to the relay during operation may cause

considerable damage to or wearing of the contacts. Note that

operation of a snap switch mounted close to the relay or

shock due to the operation of magnetic solenoid may also

Nominal

coil voltage

0

<1msec.

<1msec.

-60 -40 -20 0 20 40

60

80 100

80

60

40

20

85

5

Humidity

(%RH)