Omron A165e - User manual

Emergency Stop Switch (16-dia.)

A165E

Separate Construction with Smallest

Class of Depth in the World

■Direct opening mechanism to open contacts in emergencies,

such as when they are welded.

■Conforms to EN418.

■Includes a safety lock to prevent misuse.

■Features separate construction that allows the Switch to be

separated for easier wiring and one-piece-like construction

that allows easier handling.

■Models available with 3 contacts built into a single block

(A165E-U).

Model Number Structure

List of Models

Model Number Legend (Completely Assembled).........................Shipped as a set that includes the Operation Unit

and light source.

Diameter of

Operation Unit Function Model Shape

30-mm models

40-mm models

Push-Lock,

turn-reset

A165E Separate

construction

(30-mm model)

A165E-@-03U One-piece

construction

(30-mm model)

Be sure to read the precautions for all pushbutton switches

in the Pushbutton Switches Group Catalog (Cat. No. X032),

as well as the “Safety Precautions” on page 9.

None

24D

IP65 (Oil-resistant)

03U

2. Light Source

1. Operation Unit Shape and Functions

Code

30 dia.

40 dia.

3. Contacts

Code Description

SPST-NC

DPST-NC

TPST-NC *

*TPST-NC models have

one-piece construction with

the contact unit. Only

non-lighted models are

available.

Note: Models with separate construction

(SPST-NC and DPST-NC) are for

normal loads only. One-piece models

(TPST-NC) are for either normal loads

or microloads.

Non-lighted

Lighted

Non-lighted

Lighted

Push-lock,

turn-reset

Code

Non-lighted

LED 24 VDC 24 VDC

--- ---

Functions

Type Operation

voltage Rated

voltage

Pushbutton

LS 24D 02

http://www.ia.omron.com/ 1

A165E

Ordering Information

List of Sets

List of Sets (in Different Colors)

* Models with yellow or gray pushbutton colors cannot be used as emergency switches.

Individual Parts (for Switches with Separate Construction)

Operation Units

Lamps

Sockets

Socket Units

Illumination Rated voltage

Pushbutton color

Pushbutton size Terminal Contact form Model

LED 24 VDC

Red

30 dia.

Solder terminal

SPST-NC A165E-LS-24D-01

DPST-NC A165E-LS-24D-02

Non-lighted --- SPST-NC A165E-S-01

DPST-NC A165E-S-02

LED 24 VDC

40 dia.

SPST-NC A165E-LM-24D-01

DPST-NC A165E-LM-24D-02

Non-lighted --- SPST-NC A165E-M-01

DPST-NC A165E-M-02

Non-lighted --- 30 dia. TPST-NC A165E-S-03U

40 dia. A165E-M-03U

Illumination Pushbutton color * Pushbutton size Terminal Contact form Model

Non-lighted

Yellow

30 dia.

Solder terminal

SPST-NC A165E-SY-01

Gray A165E-SGR-01

Yellow DPST-NC A165E-SY-02

Gray A165E-SGR-02

Yellow

40 dia.

SPST-NC A165E-MY-01

Gray A165E-MGR-01

Yellow DPST-NC A165E-MY-02

Gray A165E-MGR-02

Yellow 30 dia.

TPST-NC

A165E-SY-03U

Gray A165E-SGR-03U

Yellow 40 dia. A165E-MY-03U

Gray A165E-MGR-03U

Appearance Illumination Model

dia. Non-lighted A165E-S

Lighted A165E-LS

40 dia. Non-lighted A165E-M

Lighted A165E-LM

Appearance LED color Rated

voltage Model

Red Bright

5VDC A16-5DSR

12 VDC A16-12DSR

24 VDC A16-24DSR

Appearance Illumination Contact

form Model

Non-lighted SPST-NC A165E-01

DPST-NC A165E-02

Lighted SPST-NC A165E-01L

DPST-NC A165E-02L

Appearance Illumination Contact

form Model

Lighted SPST-NC A165E-R-24D-01

DPST-NC A165E-R-24D-02

http://www.ia.omron.com/ 2

A165E

Accessories (Order Separately)

Specifications

Certified Standard Ratings

UL508, CSA C22.2 No.14, CCC(GB14048.5)

Models with Separate Construction

Models with One-piece Construction

TÜV(EN60947-5-1)

Models with Separate Construction

Models with One-piece Construction

Certified Standards

* Certification for CSA C22.2 No. 14 is indicated by the mark.

Switch Ratings

Models with Separate Construction

Minimum applicable load: 5 VDC, 150 mA

Models with One-piece Construction

Minimum applicable load: 5 VDC, 1 mA

LED Ratings

(Only for Models with LEDs)

Item Appearance Type Model Precautions

Yellow Plate Yellow, 45 dia. A16Z-5070 Use this as an emergency stop

nameplate.

Panel Plug Round A16ZT-3003

Used for covering the panel cutouts

for future panel expansion.

Degree of protection: IP40

Color: Black

Tightening Tool --- A16Z-3004 Useful for repetitive mounting. Be

careful not to tighten excessively.

Extractor A16Z-5080 Convenient for extracting the Switch

and Lamp.

Rated voltage Resistive load

125 VAC

250 VAC

30 VDC

5 A

3 A

Rated voltage Resistive load

125 VAC

250 VAC

30 VDC

1 A

0.5 A

1 A

Rated voltage Resistive load

250 VAC

30 VDC

3 A

Rated voltage Resistive load

250 VAC

30 VDC

0.5 A

1 A

Certification body Standards File No.

UL * UL508,

CSA C22.2 No.14 E41515

TÜV Product Service EN60947-5-1,

EN60947-5-5 Inquire

CQC (CCC) GB14048.5 2003010303070678

Rated voltage Resistive load

125 VAC

250 VAC

30 VDC

5 A

3 A

Rated voltage Resistive load

125 VAC

250 VAC

30 VDC

1 A

0.5 A

1 A

Rated voltage Rated current Operation voltage

24 VDC 10 mA 24 VDC±5%

http://www.ia.omron.com/ 3

A165E

Characteristics

*1.LED not mounted. (Test them with the LED removed.)

*2.Degree of protection from the front of the panel.

Operating Characteristics

Structure and Nomenclature

Type

Item

Emergency Stop Switch

Non-lighted

A165E-S/A165E-M Lighted

A165E-LS/A165-LM

Non-lighted,

One-piece construction

A165E-U

Allowable operating

frequency

Mechanical 20 operations/minute max.

Electrical 10 operations/minute max.

Insulation resistance 100 M:min. (at 500 VDC)

Dielectric strength

Between terminals of same polarity 1,000 VAC, 50/60 Hz for 1 min

Between terminals of different

polarity 2,000 VAC 50/60 Hz for 1 min

Between each terminal and ground 2,000 VAC 50/60 Hz for 1 min

Between lamp terminals 1,000 VAC, 50/60 Hz for 1 min *1 ---

Vibration resistance Malfunction 10 to 55 Hz, 1.5-mm double amplitude (malfunction within 1 ms)

Shock resistance

Destruction 500 m/s2

Malfunction 300 m/s2max.

(malfunction within 1 ms)

150 m/s2max.

(malfunction within 1 ms)

Durability Mechanical 100,000 operations min.

Electrical 100,000 operations min.

Degree of protection IP65 Oil-resistant *2 IP65 *2 IP65 Oil-resistant *2

Electric shock protection class Class II

PTI (tracking characteristic) 175

Degree of contamination 3 (EN60947-5-1)

Weight Approx. 16 g (in case of DPST-NC Switches)

Ambient operating temperature 10 to 55qC (with no icing or condensation)

Ambient operating humidity 35% to 85%

Ambient storage temperature 25 to 65qC (with no icing or condensation)

Type

Item Characteristics of models

with separate construction Characteristics of models

with one-piece construction

Operating force OF max. 14.7 N 14.7 N

Releasing force RF min. 0.1 N·m 0.1 N·m

Pretravel PT 3.5r0.5 mm 3r0.5 mm

Color

Operation Unit Color

• Models with LED illumination: Red

• Non-lighted models * : Red, yellow, or gray

Degree of Protection

IP65 oil resistance

Specifications

For standard load

125 VAC, 5 A

250 VAC, 3 A

30 VDC, 3 A

Operation Unit

Socket

(The above figure is example of the

separate construction model.)

* Models with yellow or gray pushbutton colors cannot be used as emergency switches.

http://www.ia.omron.com/ 4

A165E

Dimensions (Unit: mm)

22.1±0.8

10.8±5

A165E-S

Mounting ring

Lock ring

Lock

Packing (t=0.5)

16+0.2 dia.

3+0.1 dia.

30 dia.

Non-lighted models

30 mm diameter

7.8+0.3

Panel cutout

dimensions

·When applying a coating such as

paint to the panel, dimensions

after the coating must satisfy the

specified dimensions.

·Recommended panel thickness:

0.5 to 3.2 mm.

M16 × 1

16+0.2 dia.

3+0.1 dia.

Lock ring

Lock

Packing (t=0.5)

Mounting ring

30 dia.

A165E-LS

Lighted models

30 mm diameter

7.8+0.3

Panel cutout

dimensions

·When applying a coating such as

paint to the panel, dimensions

after the coating must satisfy the

specified dimensions.

·Recommended panel thickness:

0.5 to 3.2 mm.

M16 × 1

22.1±0.8

21.5±0.5

A165E-S-03U

Mounting ring

Packing (t=0.5)

Lock ring

Mounting ring

16+0.2 dia.

03+0.1 dia.

30 dia.

7.8+0.3

Panel cutout

dimensions

·When applying a coating such as

paint to the panel, dimensions

after the coating must satisfy the

specified dimensions.

·Recommended panel thickness:

0.5 to 3.2 mm.

Non-lighted,

One-piece construction models

30 mm diameter M16 × 1

http://www.ia.omron.com/ 5

A165E

M16 ×1

10.8±0.5

21.1±0.8

28.5±0.8

20±0.8

1.42.6

0.5

12.3

15.8

2.8

12.1

A165E-M

Mounting ring

Lock ring

Lock

Packing (t=0.5)

40 dia.

Switch

Non-lighted models

40 mm diameter

16+0.2 dia.

3+0.1 dia.

7.8+0.3

Panel cutout

dimensions

·When applying a coating such as

paint to the panel, dimensions

after the coating must satisfy the

specified dimensions.

·Recommended panel thickness:

0.5 to 3.2 mm.

M16 ×1

0.5

12.3

15.8

2.8

6.05

A165E-LM

Mounting ring

Lock ring

Lock

Packing (t=0.5)

40 dia.

Switch

Lighted models

40 mm diameter

16+0.2 dia.

3+0.1 dia.

7.8+0.3

Panel cutout

dimensions

·When applying a coating such as

paint to the panel, dimensions

after the coating must satisfy the

specified dimensions.

·Recommended panel thickness:

0.5 to 3.2 mm.

M16 ×1

21.5±0.5 1

A165E-M-03U

Mounting ring

Lock ring

40 dia.

Lock

Packing (t=0.5)

One-piece construction models

40 mm diameter

3+0.1 dia.

16+0.2 dia.

7.8+0.3

Panel cutout

dimensions

·When applying a coating such as

paint to the panel, dimensions

after the coating must satisfy the

specified dimensions.

·Recommended panel thickness:

0.5 to 3.2 mm.

http://www.ia.omron.com/ 6

A165E

Accessories

Terminal Arrangement

Note: The L+ and Lterminals are not available with the non-lighted models.

Yellow Plate (Vinyl Chloride)

Lock Ring

Panel Plugs (Round Type)

A16ZT-3003

xSelect an appropriate Panel Plug according to the panel design and

mount from the front side of the panel. Panel cutout dimensions are

the same as those for the Switch.

Tightening Tool

t=1

A16Z-5070

15.6 dia.

45 dia.

12 ×12

15.8 ±0.1 dia.

Rough surface

15 dia. 0

−0.1

Rough

surface

18 dia.

A16Z-3004

18 dia.

SPST Switches DPST Switches TPST Switches

NC1

L−

L+

SW1

NC1 NC2

NC2

NC1

L−

L+

SW1 SW2

NC2

NC1

NC3

Stopper

http://www.ia.omron.com/ 7

A165E

Installation

Mounting to the Panel (Models with Separate Construction)

After installing the Operation Unit, snap in the Switch from the back of the panel.

(1) Installing the Operation Unit

(2) Mounting the Switch (3) Removing the Switch

xSnap on the Switch to the Operation Unit.

xMake sure that the Switch has the correct orientation when snapping it onto the

Operation Unit.

xAlign the white dot on the Operation Unit with the guide groove on the side of

the Switch marked with an “L” as shown below, and push the Switch into the

Operation Unit until it clicks into place. Confirm that the Switch is securely in

place before using.

xInsert the prongs of the A16Z-5080 Extractor between the Switch and the

Operation Unit, grip the Switch, and pull to remove.

(4) Installing the LED Lamp

xWhen mounting the Lamp, make sure it is facing the direction shown in the

following diagram. Insert the Lamp while matching the protruding part of the

Lamp and the small guides on the outer surface of the casing.

Panel

Mounting nut

Lock ring

Rubber packing or Yellow Plate (sold separately)

Edge

Lock

Cutout

Panel

Mounting nut

Lock hole

Lock ring

Rubber packing

(included with the

product) or Yellow

Plate (sold separately)

xAttach rubber packing or the Yellow Plate

onto the Switch from its terminal side.

Insert the Switch into the panel from the

front. Install the lock ring and mounting

nut from the terminal side and tighten.

xAdjust the slits on the hole of rubber

packing and Yellow Plate to the

protruding part of the Unit.

xRubber packing is not necessary when

the Yellow Plate is used.

xTighten the nut to the torque of 0.29 to

0.49 N·m.

xCasing should be installed with its

protruding part adjusted to the slit of the

panel hole.

xAlign the lock ring to the groove of the

casing so that the edge is drawn to the

panel side.

White dot

Guide groove

L marking Extractor (A16Z-5080)

Narrow guide

Protruding part Wide guide

http://www.ia.omron.com/ 8

A165E

Safety Precautions

Be sure to read the precautions for all pushbutton switches in the Pushbutton Switches Group Catalog (Cat. No. X032).

!CAUTION

If the Operation Unit is separated from the Socket Unit, the

equipment will not stop, creating a hazardous condition.

Always confirm that safety functions are operating before

starting operation.

Mounting

xAlways make sure that the power is turned OFF before mounting,

removing, or wiring the Switch, or performing maintenance.

Electrical shock or fire may result if the power is not turned OFF.

xThe tightening torque is 0.29 to 0.49 N·m.

Wiring

xBe sure to use electrical wires that are a size appropriate for the

applied voltage and carry current. Perform soldering according to

the conditions given below. If the soldering is not properly

performed, abnormal heating may result, possibly resulting in fire.

1. Hand soldering: 30 W, within 5 s

2. Dip soldering: 240qC, within 3 s

Wait for one minute after soldering before exerting any external

force on the solder.

xUse non-corrosive resin fluid as the flux.

xMake sure that the electric cord is wired so that it does not touch

the Unit. If the electric cord will touch the Unit, then electric wires

with a heat resistance of 100qC min. must be used.

xAfter wiring the Switch, maintain an appropriate clearance and

creepage distance.

Operating Environment

xThe IP65 model is designed with a degree of protection so that it

will not sustain damage if it is subjected to water from any direction

to the front of the panel.

xThe Switch is intended for indoor use only. Using the Switch

outdoor may cause it to fail.

Using the Microload

xInsert a contact protection circuit, if necessary, to prevent the

reduction of life expectancy due to extreme wear on the contacts

caused by loads where inrush current occurs when the contact is

opened and closed.

xThe A165E-@U (one-piece construction) allows both a standard

load (125 V at 1 A, 250 V at 0.5 A) and a microload. If a standard

load is applied, however, the microload area cannot be used. If the

microload area is used with a standard load, the contact surface

will become rough, and the opening and closing of the contact for

a microload may become unreliable.

xThe minimum applicable load is the N-level reference value. This

value indicates the malfunction reference level for the reliability

level of 60% (O60) (conforming to JIS C5003).

The equation, O60 = 0.5 x 106/time indicates that the estimated

malfunction rate is less than 1/2,000,000 with a reliability level of

60%.

LEDs

xThe LED current-limiting resistor is built-in, so external resistance

is not required.

Operating Torque

xDo not exceed an operating torque of 0.49 N·m in the direction of

rotation.

xDo not pull the operating button or apply excessive force to any

side of the button.

Otherwise it may be damaged.

Others

xThe oil-resistant IP65 uses NBR rubber and is resistant to general

cutting oil and cooling oil. Some special oils cannot be used with

the oil-resistant IP65, however, so contact your OMRON

representative for details.

xIf the panel is to be coated, make sure that the panel meets the

specified dimensions after coating.

xDue to the structure of the Switch, severe shock or vibration may

cause malfunctions or damage to the Switch.

Also, most Switches are made from resin and will be damaged if

they come into contact with sharp objects. Particularly scratches

on the Operation Unit may create visual and operational obtrusions.

Handle the Switches with care, and do not throw or drop them.

Precautions for Correct Use

0.15 mA

1 mA

Area of use

Voltage (V)

Current (mA)

Invalid

area

Rated voltage Internal limiting resistor

24 VDC 2000 :

Screwdriver

Hammer

Do not allow the

Switch to drop and hit

the floor.

Do not place or drop

heavy objects on the

Switch.

Do not operate the

Switch with hard or

sharp objects.

http://www.ia.omron.com/ 9

http://www.ia.omron.com/ C-1

Safety Precautions for All Pushbutton Switches

For the individual precautions for a Switch, refer to the Safety Precautions in the section for that Switch.

Do not perform wiring with power supplied to the

Switch. Do not touch the terminals or other charged

parts of the Switch while power is being supplied.

Doing so may result in electric shock.

Do not apply a voltage between the incandescent lamp

and the terminal that is greater than the rated voltage.

Doing so may damage the lamp or LED and cause the

Operation Unit to pop out.

Always turn OFF the power and wait for 10 minutes

before replacing the incandescent lamp. If the lamp is

replaced immediately after the power is turned OFF,

the remaining heat may cause burns.

For details, refer to the Precautions for Correct Use in the

Technical Guide for Pushbutton Switches.

WARNING

Caution

Precautions for Correct Use

http://www.ia.omron.com/ C-2

Technical Guide for Pushbutton Switches

Precautions for Correct Use of Pushbutton Switches

●For the individual precautions for a Switch, refer to the precautions in the section for that Switch.

Electrical Characteristics

1. Operating Load

xThe switching load capacity of the Switch greatly varies between

AC and DC. Always be sure to apply the rated load. The control

capacity will drastically drop if it is a DC load. This is because a DC

load has no current zero-cross point, unlike an AC load. Therefore,

if an arc is generated, it may continue for a comparatively long time.

Furthermore, the current direction is always the same, which

results in a contact relocation phenomena whereby the contacts

easily stick to each other and do not separate when the surfaces of

the contacts are uneven.

Some types of load have a great difference between normal current

and inrush current. Make sure that the inrush current is within the

permissible value. The greater the inrush current in the closed circuit

is, the greater the contact abrasion or shift will be. Consequently,

contact weld, contact separation failures, or insulation failures may

result. Furthermore, the Switch may be broken or damaged.

If the load is inductive, counter-electromotive voltage will be generated.

The higher the voltage is, the higher the generated energy will be,

which will increase the abrasion of the contacts and contact relocation

phenomena. Be sure to use the Switch within the rated conditions.

Inrush Current

xApproximate control capacities are given in ratings tables, but

these alone are insufficient to guarantee correct operation. For

special types of load, with unusual switching voltage or current

waveforms, test whether correct operation is possible with the

actual load before application.

xWhen switching for microloads (voltage or current), use a Switch

with microload specifications. The reliability of silver-plated

contacts, which are used in Switches for standard loads, will be

insufficient for microloads.

When switching microloads or very high loads that are beyond the

switching capacity of the Switch, connect a relay suitable for the load.

Type of Load vs. Inrush Current

All the performance ratings given are for operation under the following

conditions unless otherwise specified.

Inductive load

: A minimum power factor of 0.4 (AC) and a maximum

time constant of 7 ms (DC)

Lamp load: An inrush current 10 times higher than the steady-state

current

Motor load: An inrush current 6 times higher than the steady-state

current

Note: Inductive loads can cause problems especially in DC circuitry. Therefore,

it is essential to know the time constants (L/R) of the load.

2. Load Connections

Do not contact a single Switch to two power supplies that are different

in polarity or type.

Connection of Different Polarities

The power supply may short-circuit if the loads are connected in the

way shown in the "incorrect" example below.

Even in the "correct" example, note that the insulation performance of

the switch may deteriorate and the switch life may be shortened

because loads are connected to both contacts.

Connection of Different Power Supplies

The DC and AC power may be mixed for the circuit shown below.

Do not design a circuit where voltage is imposed between contacts,

otherwise contact weld may result.

o (Steadystate

current)

i (Inrush current)

(A)

Relay

(Approxi-

mately 4 to 5

times higher)

Motor

(Approximately

5 to 10 times

higher)

Incandescent

lamp (Approximately 10 to 15 times

higher)

Solenoid

(Approximately 10 to 20 times higher)

(A)

Load

Incorrect

correct

Connect the load to the same polarity.

Load

Incorrect

Load

100 V

200 V

Incorrect

http://www.ia.omron.com/ C-3

Technical Guide for Pushbutton Switches

3. Contact Protective Circuit

Apply a contact protective circuit to extend the contact life, prevent

noise, and suppress the generation of carbide or nitric acid. Be sure

to apply the contact protective circuit correctly, otherwise an adverse

effect may occur. The following provides typical examples of contact

protective circuits. If the Limit Switch is used in an excessively humid

location for switching a load that easily generates arcs, such as an

inductive load, the arcs may generate NOx, which will change into

HNO3if it reacts with moisture. Consequently, the internal metal parts

may corrode and the Limit Switch may fail. Be sure to select the ideal

contact preventive circuit from the following.

Typical Examples of Contact Protective Circuits

Do not apply contact protective circuits as shown below.

4. Switching

Do not use the Switch for loads that exceed the rated switching capacity or other

contact ratings. Doing so may result in contact weld, contact separation failures,

or insulation failures. Furthermore, the Switch may be broken or damaged.

xDo not touch the charged switch terminals while power is supplied,

otherwise an electric shock may be received.

xThe life of the Switch varies greatly with switching conditions.

Before using the Switch, be sure to test the Switch under actual

conditions. Make sure that the number of switching operations is

within the permissible range. If a deteriorated Switch is used

continuously, insulation failures, contact weld, contact failures,

switch damage, or switch burnout may result.

xDo not apply excessive or incorrect voltages to the Switch or

incorrectly wire the terminals. Otherwise, the Switch may not

function properly and have an adverse effect on external circuitry.

Furthermore, the Switch itself may become damaged or burnt.

xDo not use the Switch in locations where flammable or explosive

gases are present. Otherwise switching arcs or heat radiation may

cause a fire or explosion.

xDo not drop or disassemble the Switch, otherwise it may not be

capable of full performance. Furthermore, it may be broken or

burnt.

Circuit example

Applicable

current

Feature and details Element selection

AC DC

CR circuit

*Yes *When AC is switched, the load impedance

must be lower than the CR impedance.

C: 1 to 0.5 PFuswitching current (A)

R: 0.5 to 1 :uswitching voltage (V)

The values may change according to the

characteristics of the load. The capacitor

suppresses the spark discharge of current

when the contacts are open. The resistor

limits the inrush current when the contacts

are closed again. Consider the roles of the

capacitor and resistor and determine ideal

capacitance and resistance values through

testing. Basically, use a capacitor with a

dielectric strength between 200 and 300 V.

When AC is switched, make sure that the

capacitor has no polarity.

Yes Yes

The operating time will be greater if the load

is a relay or solenoid. Connecting the CR

circuit in parallel to the load is effective when

the power supply voltage is 24 or 48 V and in

parallel to the contacts when the power

supply voltage is 100 to 200 V.

Diode method No Yes

Energy stored in the coil is changed into

current by the diode connected in parallel to

the load. Then the current flowing to the coil

is consumed and Joule heat is generated by

the resistance of the inductive load. The

reset time delay with this method is longer

than that in the CR method.

The diode must withstand a peak inverse

voltage 10 times higher than the circuit

voltage and a forward current as high or

higher than the load current.

Diode and

Zener diode

method

No Yes

This method will be effective if the reset time

delay caused by the diode method is too

long.

Use a Zener diode with a Zener voltage that

is approximately 1.2 upower supply voltage

as, depending on the environment, the load

may not operate.

Varistor

method Yes Yes

This method makes use of constant-voltage

characteristic of the varistor so that no

high-voltage is imposed on the contacts.

This method causes a reset time delay.

Connecting a varistor in parallel to the load is

effective when the supply voltage is 24 to 48

V and in parallel to the contacts when the

supply voltage is 100 to 200 V.

---

This circuit effectively

suppresses arcs when the

contacts are OFF. The

capacitor will be charged,

however, when the contacts

are OFF. Consequently,

when the contacts are ON

again, short-circuited current

from the capacitance may

cause contact weld.

This circuit effectively sup-

presses arcs when the

contacts are OFF. When the

contacts are ON again,

however, charge current will

flow to the capacitor, which

may result in contact weld.

Power

supply

Inductive

load

Inductive

load

Power

supply

Inductive

load

Power

supply

Inductive

load

Power

supply

Inductive

load

Power

supply

Switching a DC inductive load is usually

more difficult than switching a resistive

load. By using an appropriate contact

protective circuit, however, switching a DC

inductive load will be as easy as switching a

resistive load.

Load

Power

supply

CLoad

Power

supply

http://www.ia.omron.com/ C-4

Technical Guide for Pushbutton Switches

Mechanical Conditions

Operating Force and Operating Method

xFingertip operation is an important feature of Pushbutton Switches.

In terms of Switch operation, Pushbutton Switches differ greatly

from detection switches such as Microswitches. Operating the

Switch using a hard object (e.g., metal), or with a large or sudden

force, may deform or damage the Switch, resulting in faulty or rough

operation, or shortening of the Switch life. The strength varies with

the size and construction of the Switch. Use the appropriate Switch

for the application after confirming the operating method and

operating force with this catalog.

xThe pushbutton surface is composed of resin. Therefore, do not

attempt to operate the pushbutton using a sharp object, such as a

screwdriver or a pair of tweezers. Doing so may damage or deform

the pushbutton surface and result in faulty operation.

Mounting

xSwitches can be broadly divided into two categories according to

mounting method: panel-mounting models and PCB-mounting

models. Use the appropriate model for the mounting method

required. Basically, panel-mounting Switches can withstand a

greater operating force than PCB-mounting Switches. If, however,

the panel thickness or the panel-cutout dimensions are not suitable

for the Switch, it may not be able to withstand the normal operating

force. With continuous mounting in particular, select a panel of a

thickness that is easily sufficient to withstand the total operating

force.

xPanel-mounting Switches can be divided into two categories

according to the mounting method: snap-in mounting models and

screw-mounting models. Snap-in mounting Switches are held in

place with the elasticity of resin or a metal leaf spring. Do not

attempt to modify the spring after mounting. Doing so may result in

faulty operation or damage the mounting structure. Mount screw-

mounting models using the screws and nuts provided (or

individually specified). Tighten the screws to the specified torque.

Mounting with different screws or nuts, or tightening beyond the

specified torque may result in distortion of the inside of the case or

damage to the screw section.

xSubjecting the Switch to severe vibrations or shock may result in

faulty operation or damage. Also, many of the Switches are

composed of resin so contact with sharp objects may result in

damage to the surface. This kind of damage may spoil the

appearance of the Switch or result in faulty operation. Do not throw

or drop the Switch.

Hammer

Do not apply

excessive or

sudden force.

Do not use

sharp objects.

Screwdrive

Tweezers

Do not attempt to

modify the spring

after mounting.

Use the

screws and

nuts provided

(or specified).

Snap-in Mounting Screw Mounting

Do not drop or

knock the Switch.

Do not drop object

or place

heavy objects on

the Switch.

Hammer Screwdriver

Do not operate the

Switch with heavy

or sharp objects.

http://www.ia.omron.com/ C-5

Technical Guide for Pushbutton Switches

Mounting Precautions

Wiring

•

Perform wiring so that the lead wires will not be caught on other objects

as this will cause stress on the Switch terminals. Wire the Switch so

that there is slack in the lead wires and fix lead wires at intermediate

points. If the panel to which the Switch is mounted needs to be opened

and closed for maintenance purposes, perform wiring so that the

opening and closing of the panel will not interfere with the wiring.

•With miniature Switches, the gap between the terminals is very

narrow. Use protective or heat-absorbing tubes to prevent burning

of the wire sheath or shorting.

Soldering

•There are two methods for soldering the Switch: hand soldering and

automatic soldering. In addition, automatic soldering itself can be

divided into two types : dip soldering and reflow soldering. Use the

soldering method appropriate for the mounting method.

Typical Soldering Example

•Do not use soldering flux that contains chlorine. Doing so may

result in metal corrosion.

•Perform hand soldering using the appropriate soldering iron.

•With the exception of PCB-mounting Switches, when performing

hand soldering, hold the Switch so that the terminals point

downwards so that flux does not get inside the Switch.

•Leave a gap of at least 1 mm between the soldered parts and the

surface of the case so that flux does not get inside the Switch.

•When applying flux using a brush, use a sponge soaked in flux as

shown below. Do not apply more than is necessary. Also, apply the

flux with the PCB inclined at an angle of less than 80°so that flux

does not flow onto the mounting surface of the Switch.

Method Soldering device Application

Hand soldering Soldering iron

Small quantities

Different materials

Lead wire terminals

Automatic

soldering

Dip

soldering

Jet soldering bath

Dip soldering bath

Large quantities of

discrete terminals

Reflow

soldering

Infrared reflow (IR)

soldering bath

Vapor-phase (VPS)

reflow soldering bath

Large quantities

of miniature SMD

terminals

Protective tube

lTermina

Lead wire

Large-capacity

soldering iron

Small-capacity

soldering iron

used for a long

time

Perform soldering for

between 3 to 5 s with

a suitable soldering iron.

Case

Terminal

Solder 1 mm min.

Lead wire

Flux

Sponge

soaked in flux

Brush

80°

max.

http://www.ia.omron.com/ C-6

Technical Guide for Pushbutton Switches

•Do not place PCBs that have had flux applied or have been

soldered on top of each other. Otherwise, the flux on the PCBs

solder surface may stain the upper part of the Switch or even

permeate the inside of the Switch and cause contact failure.

Be sure to insert a special PCB stocker.

•When performing soldering with a dip soldering bath, ensure that

the flux does not reach a higher level than the PCB.

•Flux is especially likely to rise up at the edges of the PCB. If the

Switch is mounted near the edge of the PCB, create a gap between

the edge by using a split PCB, and insert the PCB in the soldering

bath so that the edge that is farthest from the Switch enters the bath

first.

Storage

•When the Switch is left unused or stored for long periods, the

ambient conditions can have a great effect on the condition of the

Switch. In certain environments, leaving the Switch exposed may

result in deterioration (i.e., oxidation, or the creation of an oxide

film) of the contacts and terminals, causing the contact resistance

to increase, and making it difficult to solder the lead wires.

Therefore, store in a well-ventilated room, inside, for example, a

non-hygroscopic case, in a location where no corrosive gases are

present.

•If the Switch is stored in a location where it will be exposed to direct

light, colored resin in the colored plate may fade. Therefore, do not

store the Switch in locations where it will be exposed to direct light.

Flux

Do not place PCBs

with solder or flux on

top of each other.

Create distance

Split PCB

Create distance

Insert in soldering

bath from this

edge.

Flux is more likely

to rise at the edges.

This catalog is a guide to help customers select the proper safety products. Observe the following items when choosing

products, select the right products for your devices or equipment, and develop a safety-related system to fully utilize product

functions.

Setting Up a Risk Assessment System

The items listed in this catalog must be used properly in terms of product location as well as product performance and

functionality. Part of the process of selecting and using these products should include the introduction and development of a

risk assessment system early in the design development stage to help identify potential dangers in your equipment that will

optimize safety product selection. A badly designed risk assessment system often results in poor choices when it comes to

safety products.

• Related International Standards:

ISO 14121 Principles of Risk Assessment

Safety Policy

When developing a safety system for the devices and equipment that use safety products, make every effort to understand

and conform to the entire series of international and industrial standards available, such as the examples given below.

• Related International Standards:

ISO 12100 Basic Concepts, General Principles for Design

IEC 61508 Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems

Role of Safety Products

Safety products have functions and mechanisms that ensure safety as defined by standards. These functions and

mechanisms are designed to attain their full potential within safety-related systems. Make sure you fully understand all

functions and mechanisms, and use that understanding to develop systems that will ensure optimal usage.

• Related International Standards:

ISO 14119 Interlocking Devices Associated with Guards-Principles for Design and Selection

Installing Safety Products

Make sure that properly educated and trained engineers are selected to develop your safety-related system and to install

safety products in devices and equipment.

• Related International Standards:

ISO 12100 Basic Concepts, General Principles for Design

IEC 61508 Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems

Observing Laws and Regulations

Safety products should conform to pertinent laws, regulations, and standards, but make sure that they are used in

accordance with the laws, regulations, and standards of the country where the devices and equipment incorporating these

products are distributed.

• Related International Standards:

IEC 60204 Electrical Equipment of Machines

Observing Usage Precautions

Carefully read the specifications and precautions listed in this catalog for your product as well as all items in the Operating

Manual packed with the product to learn usage procedures that will optimize your choice. Any deviation from precautions

will lead to unexpected device or equipment failure not anticipated by safety-related systems or fire originating from

equipment failure.

Transferring Devices and Equipment

When transferring devices and equipment, be sure to keep one copy of the Operating Manual and pack another copy with

the device or equipment so the person receiving it will have no problem operating it.

• Related International Standards:

ISO 12100 Basic Concepts, General Principles for Design

IEC 61508 Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems

WARNING

2007.11

OMRON Corporation

Industrial Automation Company

In the interest of product improvement, specifications are subject to change without notice.

Read and Understand This Catalog

Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or

comments.

Warranty and Limitations of Liability

WARRANTY

OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if

speciﬁed) from date of sale by OMRON.

OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR

FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE

HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL

OTHER WARRANTIES, EXPRESS OR IMPLIED.

LIMITATIONS OF LIABILITY

OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, OR COMMERCIAL

LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR

STRICT LIABILITY.

In no event shall responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.

IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS REGARDING THE PRODUCTS UNLESS

OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT

SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.

Application Considerations

SUITABILITY FOR USE

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's

application or use of the product.

At the customer's request, OMRON will provide applicable third party certiﬁcation documents identifying ratings and limitations of use that apply to the

products. This information by itself is not sufﬁcient for a complete determination of the suitability of the products in combination with the end product,

machine, system, or other application or use.

The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible

uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:

• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this catalog.

• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety

equipment, and installations subject to separate industry or government regulations.

• Systems, machines, and equipment that could present a risk to life or property.

Please know and observe all prohibitions of use applicable to the products.

NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE

SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT IS PROPERLY RATED AND

INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

Disclaimers

CHANGE IN SPECIFICATIONS

Product speciﬁcations and accessories may be changed at any time based on improvements and other reasons.

It is our practice to change model numbers when published ratings or features are changed, or when signiﬁcant construction changes are made.

However, some speciﬁcations of the product may be changed without any notice. When in doubt, special model numbers may be assigned to ﬁx

or establish key speciﬁcations for your application on your request. Please consult with your OMRON representative at any time to conﬁrm actual

speciﬁcations of purchased product.

DIMENSIONS AND WEIGHTS

Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.

ERRORS AND OMISSIONS

The information in this catalog has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical,

typographical, or proofreading errors, or omissions.

PERFORMANCE DATA

Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent

the result of OMRON’s test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON

Warranty and Limitations of Liability.

PROGRAMMABLE PRODUCTS

OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.

This catalog shall not be copied for sales or promotions without permission.

This catalog is protected by copyright and is intended solely for use in conjunction with the product. Please notify us before copying or reproducing this