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ManualsBrandsOmron Electronic Components ManualsPower RelaysPCB Power Relay G6B, 1NO + 1NC, DC, 12V, 480Ohm

Technical Information – Relays

■

Relay Classification

SEALING

Unsealed Relays

Relays of this type are intended for manual soldering. No

measures are taken against penetration of flux and cleaning

solvent into the relay. This type of relay cannot be immersion-

cleaned.

Flux-protection Relays

Special design construction prevents flux from penetrating into

the relay housing, for example, due to capillary action up the

terminals when the relay is soldered onto a PCB. This type of relay

also cannot be immersion-cleaned.

Fully Sealed Relays

Fully sealing prevents not only flux, but also cleaning solvent from

penetrating into the relay housing. Therefore, this type of relay

can be immersion-cleaned. Relays are each tested before being

shipped. The relay is immersed in fluorocarbon solution for

1 minute, at a temperature of 70˚C +5˚C/-0˚C, to see if gases

escape from the relay. The following figure illustrates the test

conditions.

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Construction

Relay

Fluorocarbon

solution

50 mm

Ex.) 70 °C

Model Mounting Enclosure Ratings Features

Discrete Unsealed Designed for manual soldering

G4W

G2R

G6A

G6S

Flux protection Design inhibits flux intrusion into the casing fro

the terminals during soldering.

Fully sealed Sealed resin casings and covers, limiting damage

from corrosive atmospheres.

Surface mounting Surface mounting relays permit automatic reflow soldering.

Classification Unsealed Flux protection

Construction

Automatic flux application Poor Poor Good Good

Automatic soldering Poor Poor Good Good

Automatic cleaning Poor Poor Poor Poor

Manual soldering Good Good Good Good

Penetration of dust Fair Fair

Penetration of Poor Poor

corrosive gas

Terminals separated

from PCB

Contacts located at

upper part of relay case

Terminals

separated

from PCB

Press-fit terminals

Resin seal

Terminals

separated

from PCB

0.3 mm

min. base

thickness

Inserted terminals

Terminals are separated

from PCB surface when

relay is mounted.

Features Contacts are positioned

away from base.

Terminals are pressed

into base.

Terminals are inserted

into base 0.3 mm min.

thick.

Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 10

Summary of content (23 pages)

PAGE 1
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 10 Technical Information – Relays ■ Relay Classification Model G4W Discrete Enclosure Ratings Features Unsealed Designed for manual soldering G2R Flux protection Design inhibits flux intrusion into the casing fro the terminals during soldering. G6A Fully sealed Sealed resin casings and covers, limiting damage from corrosive atmospheres. G6S ■ Mounting Surface mounting Surface mounting relays permit automatic reflow soldering.
PAGE 2
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 11 Technical Information – Relays Fully Sealed Surface Mounting PCB Relays Classification Construction Press-fit terminals Resin seal Resin seal Features Glue pad Terminals are separated from PCB surface when relay is mounted. Terminal and base, as well as the base and casing, are sealed with adhesive; the L-shaped terminals and adhesive pads allow temporary fixing to the board.
PAGE 3
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 12 Technical Information – Relays ■ Contacts Contact ratings are generally indicated according to resistive loads and inductive loads (cosϕ = 0.4 or L/R = 7 ms). Contact shape and material are also shown to guide the customer in selection of a model suitable for the intended load and required service life. When used at extremely low loads, the failure rate differs according to the contact material and contact method, as shown in the figure.
PAGE 4
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 13 MOUNTING ORIENTATION MARK TERMINAL ARRANGEMENT/INTERNAL CONNECTIONS On the top of all OMRON relays is a mark indicating where the relay coil is located. Knowing the coil location aids in designing PCBs when spacing components. Also, pin orientation is easy to discern when automatic or hand-mounting relays.
PAGE 5
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 14 Technical Information – Relays Operating Principle Release Permanent magnet This magnetic circuit has the following features: 1. High-efficiency polarized magnetic circuit utilizes power of both attraction and repulsion. 2. Balanced armature system improves resistance to both vibration and impacts. 3. Ideal mechanism for a low-profile relay.
PAGE 6
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 15 Technical Information – Relays Maximum Switching Power The maximum value of the load capacity which can be switched without problem. When using a relay, do not exceed this value. For example, when maximum switching voltage V1 is known, maximum switching current I1 can be obtained at the point of intersection on the characteristic curve “Maximum Switching Power” shown below. Conversely, maximum switching voltage V1 can be obtained if I1 is known.
PAGE 7
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 16 Technical Information – Relays Dielectric Strength The critical value which a dielectric can withstand without rupturing when a high-tension voltage is applied for 1 minute between the following points: Between coil and contact Between contacts of different polarity Between contacts of same polarity Between set coil and reset coil Between current-carrying metal parts and ground terminal Note that normally a leakage current of 3 mA is detected; howe
PAGE 8
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 17 Reset Time (Applicable to Latching Relays Only) The time that elapses from the moment a relay coil is deenergized until the NC contacts have closed, at an ambient temperature of 23˚C. (With a relay having SPST-NO contacts, this is the time that elapses until the NO contacts have operated under the same condition.) Bounce time is not included.
PAGE 9
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 18 Technical Information – Relays 2) DC-switching Relays This type of relay is often used as a so-called “marginal” relay that turns ON or OFF when the voltage or current reaches a critical value, as a substitute for a meter. However, if the relay is used in this way, its control output may fail to satisfy the ratings because the current applied to the coil gradually increases or decreases, slowing down the speed at which the contacts move.
PAGE 10
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 19 Changes in Must Operate Voltage by Coil Temperature Rise The coil resistance of a DC-switching relay increases (as the coil temperature rises) when the coil has been continuously energized, de-energized once, and then immediately energized again. This increase in the coil resistance raises the voltage value at which the relay operates. Additionally, the coil resistance rises when the relay is used at a high ambient temperature.
PAGE 11
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 20 Technical Information – Relays Dark Current in OFF Time TE Incorrect Io Correct A circuit that produces a control output as soon as the relay operates must be carefully designed. In the example on the left, electrode dark current flows as shown when the relay operates. When dark current flows into the relay coil, the relay’s resistivity to shock and vibration may degrade.
PAGE 12
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 21 Technical Information – Relays Contacts The contacts are the most important constituent of a relay. Their characteristics are significantly affected by factors such as the material of the contacts, voltage and current values applied to them (especially, the voltage and current waveforms when energizing and de-energizing the contacts), the type of load, operating frequency, atmosphere, contact arrangement, and bounce.
PAGE 13
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 22 Technical Information – Relays The following table lists examples of contact protection circuits. Circuit example Applicability CR Power source AC DC Fair Good Inductive load These values do not always agree with the optimum values due to the nature of the load and the dispersion in the relay characteristics. Confirm optimum values experimentally.
PAGE 14
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 23 ■ Latching Relays Avoid use in locations subject to excessive magnetic particles or dust. Avoid use in magnetic fields (over 8,000 A.m). Take measures to preventing problems caused by vibration or shock. Problems may originate from other relay(s) operating or releasing on the same panel. Avoid simultaneous energization of the set and reset coils, even though both coils can be continuously energized.
PAGE 15
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 24 Technical Information – Relays Item Epoxy Based Glass Epoxy (GE) Phenol-based Paper Epoxy (PE) Paper Phenol (PP) Electrical characteristics High insulation resistance. Insulation resistance hardly affected by humidity. Fair Insulation resistance degraded by humidity. Mechanical characteristics Little expansions/shrinkage caused by change in temperature or humidity. Suitable for through-hole PCBs and multi-layered PCBs.
PAGE 16
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 25 Technical Information – Relays C Mounting Method No gap between rack’s guide & PCB Screw Mounting Securely tighten screw. Place heavy components such as relays on part of PCB near where screws are to be used. A D B Conductor pitch (mm) A = w/o coating at altitude of 3,000 m max. B = w/o coating at altitude of 3,000 m or higher but lower than 15,000 m C = w/coating at altitude of 3,000 m max.
PAGE 17
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 26 Technical Information – Relays Coating As is also the case in humid environments, coating the PCB is recommended to prevent the insulation of its pattern form being degraded by gases containing harmful substances. When coating the PCB, however, care must be exercised not to allow the coating agent to penetrate into the relays mounted on the PCB; otherwise, faulty contact of the relay may occur due to sticking or coating.
PAGE 18
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 27 Process 4: Preheating Preheat the PCB at a temperature of 110˚C maximum within a period of approximately 40 seconds for smooth soldering. The characteristics of the relay may change if it is heated at a high temperature for a long time. 110°C Heater Possibility of Preheating Unsealed NO Flux protection Fully sealed YES YES Process 5: Soldering Flow soldering is recommended to assure a uniform solder joint.
PAGE 19
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 28 Technical Information – Relays Process 7: Cleaning Avoid cleaning the soldered terminals whenever possible. When a resin-type flux is used, no cleaning is necessary. If cleaning cannot be avoided, exercise care in selecting an appropriate cleaning solvent. Clensing Method Unsealed Flux protection Boiling cleaning and immersion cleaning are not possible. Clean only the back of the PCB with a brush.
PAGE 20
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 29 Technical Information – Relays Soldering Profile PCB Relays PCB RELAY THT TYPE – PROFILE OF SOLDER TEMPERATURE FOR LEAD FREE Process flow chart Flux. Application Preheating Soldering Cooling Solder Profile Do not exceed the 260¡ solder temperature and 4 sec. of soldering time. Temperature Do not exceed the 40 sec.
PAGE 21
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 30 Technical Information – Relays SURFACE MOUNTING The following tables list the processes required for mounting a relay onto a PCB and the points to be noted in each process. Process 1: Cream Solder Printing Do not use a cream solder that contains a flux with a large amount of chlorine or the terminals of the relay may be corroded.
PAGE 22
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 31 Cleaning Boiling cleaning and immersion cleaning are recommended. Ultrasonic cleaning will have an adverse effect on the performance of relays not specifically manufactured for ultrasonic cleaning.
PAGE 23
Omron A5 Catalogue 2007 1-282 11/9/06 10:16 am Page 32 Technical Information – Relays ■ Correct Use RELAYS IN ELECTRONIC CIRCUITRY Driving by Transistor When a transistor is used to drive the relay, be sure to ground the emitter of the transistor. NPN transistor PNP transistor * This safety factor must be determined by the user. ** The breakdown voltage differs, depending upon the component. Therefore, if multiple zener diodes are to be used, use their maximum breakdown voltage.