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E-197

APEM

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RF2 2-pole Force Guided Relay / SJ Series Socket

Operating Instructions

1. When using DPDT model as a force guided relay

Use in SPST-NO + SPST-NC wiring according to EN50205 (2002)

Standard

5

6

7

4

3

2

1

8

Example:

Use terminal 3-4 as NO contact and 6-7 as NC contact. Or terminal 2-3

as NC contact and terminal 5-6 as NO contact.

2. Driving Circuit for Relays

2-1. To make sure of correct relay operation, apply rated voltage to

the relay coil. Pickup and dropout voltages may differ according to

operating temperature and conditions.

2-2. Input voltage for DC coil:

A complete DC voltage is best for the coil power to make sure of

stable operation. When using a power supply containing a ripple

voltage, suppress the ripple factor within 5%. When power is supplied

through a rectification circuit, the relay operating characteristics, such

as pickup voltage and dropout voltage, depend on the ripple factor.

Connect a smoothing capacitor for better operating characteristics as

shown below.

+

–V R Relay

Smoothing

Capacitor

Pulsation

Emin Emax Emean

DC

Ripple Fctor (%)×100%

Emax−Emin

Emax

= Maximum pulsating current

Emin

= Minimum of pulsating current

Emean = DC mean value

Emean

2-3. Operating the relay in sync with an AC load:

R

TE

Load

If the relay operates in sync with AC power voltage of the load,

the relay life may be reduced. If this is the case, select a relay in

consideration of the required reliability for the load. Or, make the relay

turn on and off irrespective of the AC power phase or near the point

where the AC phase crosses zero voltage.

2-4. Leakage current while relay is OFF

When driving an element at the same time as the relay operation,

special consideration is needed for the circuit design. As shown in the

incorrect circuit at right, leakage current (Io) flows through the relay

coil while the relay is off.

Leakage current causes coil release failure or adversely affects the

vibration resistance and shock resistance. Design a circuit as shown in

the correct example.

Correct

R

lo

TE

Incorrect

R

2-5. Surge suppression for transistor driving circuits:

When the relay coil is turned off, a high-voltage pulse is generated. Be

sure to connect a diode to suppress the counter electromotive force.

Then, the coil release time becomes slightly longer. To shorten the coil

release time, connect a Zener diode between the collector and emitter

of the controlling transistor. Select a Zener diode with a Zener voltage

slightly higher than the power voltage.

R

Counter emf

suppressing

diode

Relay

+

−

2-6. The coil terminal of the relay has polarity.

Connect terminals according to the internal connection diagram.

Incorrect wiring may cause malfunction.

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