Download catalogs and CAD from http://asia.idec.com/downloads

E-198

APEM

Switches &

Pilot Lights

Control Boxes

Emergency

Stop Switches

Enabling

Switches

Safety Products

Explosion Proof

Terminal Blocks

Relays & Sockets

Circuit

Protectors

Power Supplies

LED Illumination

Controllers

Operator

Interfaces

Sensors

AUTO-ID

Interlock

Switches

Non-contact

Interlock Switches

Safety Laser

Scanners

Safety Light

Curtains

Safety Modules

FS1A

RF1V

RF2

HR2S

HR1S

RF2 2-pole Force Guided Relay / SJ Series Socket

Operating Instructions

3. Protection for Relay Contacts

3-1. The contact ratings show maximum values. Make sure that these

values are not exceeded. When an inrush current flows through the

load, the contact may become welded. If this is the case, connect a

contact protection circuit, such as a current limiting resistor.

3-2. Contact protection circuit:

When switching an inductive load, arcing causes carbides to form

on the contacts, resulting in an increased contact resistance. In

consideration of contact reliability, contact life, and noise suppression,

use of a surge absorbing circuit is recommended. Note that the release

time of the load becomes slightly longer. Check the operation using an

actual load. Incorrect use of a contact protection circuit will adversely

affect switching characteristics. Four typical examples of contact

protection circuits are shown in the following table:

Ind. Load

Power

C

R

This protection circuit can be used for both AC and

DC load power circuits.

R: Resistor of approximately the same resistance

value as the load.

C: 0.1 to 1 μF

+

–

D

Ind. Load

Power

This protection circuit can be used for DC load power

circuits. Use a diode with the following ratings.

Reverse withstand voltage:

Power voltage of the load circuit × 10

Forward current:

More than the load current

Ind. Load

Power

This protection circuit can be used for both AC and

DC load powercircuits. For the best result, when

using on a power voltage of 24 to 48V AC/DC,

connect a varistor across the load. When using on

a power voltage of 100 to 240V AC/DC, connect a

varistor across the contacts.

3-3. Do not use a contact protection circuit as shown below:

C

Load

This protection circuit is very effective in arc suppression

when opening the contacts. But, when the contacts are closed,

a current flows to charge the capacitor, causing contact

welding.

Generally, switching a DC inductive load is more difficult than switching

a DC resistive load. Using an appropriate arc suppressor will improve

the switching characteristics of a DC inductive load.

4. Usage, transport, and storage conditions

4-1. Condensation

Condensation occurs when there is a sudden change in temperature

under high temperature and high humidity conditions. The relay

insulation may deteriorate due to condensation.

4-2. Freezing

Condensation or other moisture may freeze on the relay when the

temperatures is lower than 0ºC. This causes problems such as sticking

of movable parts or delay in operation.

4-3. Low temperature, low humidity environments

Plastic parts may become brittle when used in low temperature and

low humidity environments.

5. Other Notices

5-1. General notice:



To maintain the initial characteristics, do not drop or shock the

relay.



The relay cover cannot be removed from the base during normal

operation. To maintain the initial characteristics, do not remove the

relay cover.



Use the relay in environments free from condensation, dust, sulfur

dioxide (SO2), and hydrogen sulfide (H2S).



RTII model cannot be washed as it is not a sealed type. Also make

sure that flux does not leak to the PC board and enter the relay.



Make sure that the voltage applied to the coil cotinuously does not

exceed the maximum allowable voltage.

5-2. Connecting outputs to electronic circuits:

When the output is connected to a load which responds very quickly,

such as an electronic circuit, contact bouncing causes incorrect

operation of the load. Take the following measures into consideration.



Connect an integration circuit.



Suppress the pulse voltage due to bouncing within the noise margin

of the load.

5-3. Do not use relays in the vicinity of strong magnetic fields, as this

may affect relay operation.

5-4. UL and CSA ratings may differ from product rated values

determined by IDEC.

5-5. Others

• Shock Resistance

For the best shock resistance, it is ideal to install the RF2 relay so that

the armature movent is perpendicular to the direction of vibration/

shock.

• Life

Large loads that causes arcs may result in the contact material

scattered off, accumulating around the contact. This will degrade

insulation resistance between the circuits. Make sure that the relay is

mounted in the correct direction.

• Counter-electromotive force model (diode)

Counter-electromotive force diode model has polarity. The diode

absorbs counter-electromotive force of relay coil. When excessive

external surge voltage is anticipated, take additional counter-

electromotive force measures. Otherwise the diode may be damaged.

When using general purpose relays and force guided relays closely,

use of a marking plate (optional) on the release lever or socket is

recommended, so that force guided relay can be recognized easily.

6. Notes on PC Board Mounting

• When mounting two or more relays on a PC board, keep a minimum

spacing of 5 mm in each direction. If used without spacing of 10 mm,

rated current and operating temperature differs. Consult IDEC.

• Manual soldering: Solder the terminals at 350°C within 3 sec.

• Auto-soldering: Preliminary heating at 120°C within 60 sec. Solder at

250°C within 4 to 5 sec.

• Because the terminal part is filled with epoxy resin, do not excessively

solder or bend the terminal. Otherwise, air tightness will degrade.

• Avoid the soldering iron from touching the relay cover or the epoxy

filled terminal part. Use a non-corrosive resin flux.

• Do not install the relay on the PC board in the way the PC board is

bent, otherwise copper foil may be cut or solder may be displaced

after operating for a long time or due to vibration, degrading the

relay’s performance.

• When multiple PC boards with relays are mounted to a rack, the

temperature may rise excessively. When mounting relays, leave

enough space so that heat will not build up, and so that the relays’

ambient temperature remains within the specified operating

temperature range.

Download catalogs and CAD from http://eu.idec.com/downloads