68

Surface Mount Detection Switch

D3SH

Precautions

Be sure to read the precautions and information common to all Snap Action and Detection Switches, contained in the Technical User’s Guide,

“Snap Action Switches, Technical Information” for correct use.

■ Correct Use

Mounting

The cover has the same electrical potential as the COM terminal. Do not

short-circuit the cover with a NO or NC terminal when mounting the

cover.

Be careful of the following points. Incorrect handling may lead to

insufficient actuator return, Switch damage, or reduced durability.

• Set the operating body in line with the direction of the actuator

movement, and make sure that the operating body is completely

separate from the actuator when the Switch is in the free posi-

tion (FP). When the actuator is operated from the crosswise

direction of the Switch, make sure that the corner of the operat-

ing body has a minimum radius of R1.

• Set the Switch stroke to 70% to 100% of the overtravel (the differ-

ence between the operating position and the total travel position).

• Do not subject the Switch to operations that involve strong impact.

• Do not use the Switch as a stopper.

• Do not apply excessive loads to the cover or operate the

actuator from a direction other than a specified operating

direction.

• Do not use an adhesive to secure the Switch.

A lubricant is used in the Switch. Some of the lubricant may seep out

because the Switch does not have an airtight construction. Consider

this possibility with respect to the usage conditions when designing

or using the Switch.

Application Environment

Do not use the Switch in locations that are subject to toxic gas, sili-

con, excessive dust, excessive dirt, high temperatures, high humidity,

sudden temperature changes, water splashes, or oil splashes.

Otherwise, damage resulting by faulty contact of the Switch contacts,

corrosion, or other causes, or other functional faults may occur.

Insulation and Wiring

Be sure that the installation conditions provide a sufficient insulation

distance between Switch terminals and other metal parts, lands, etc.

Cleaning

The Switch does not have an airtight construction, and it must not be

cleaned with cleaning fluids. Malfunctions may occur if the cleaning

fluid penetrates the interior of the Switch together with flux or foreign

matter from the surface of the PCB.

Confirmation with Actual Equipment

Be sure to confirm the quality of the product under the load and

environmental conditions that will be used during actual applications.

■ Caution

Electrical Ratings

Confirm the contact load in order to select an appropriate switch rat-

ing.

Do not apply an excessive electrical load to the contacts, otherwise

the contacts may weld, resulting in a short circuit or burning.

Terminal Connection

Do not use flow soldering or hand soldering to solder terminals.

Conduct reflow soldering within the range shown in the terminal tem-

perature profile below. Some reflow soldering devices have

extremely high peak values. Do a test in advance to confirm proper

soldering conditions.

Do not conduct reflow soldering more than twice. Also provide a time

interval of at least five minutes between the first and second reflow

soldering processes to allow the Switch to return to room tempera-

ture. Heating the Switch continuously (without an interval) may cause

the edges of the Switch to melt and degrade the characteristics.

When printing for a screen solder process, a 0.13-mm screen thick-

ness is recommended.

Be sure to provide local ventilation.

Printed Circuit Boards

Special attention must be paid to the handling of printed circuit

boards after a Switch has been mounted onto them. Airborne PCB

particles may penetrate the interior of the Switch when printed circuit

boards are separated by cutting. Also, do not stack printed circuit

boards that have Switches mounted on them.

Product Specification Details

This document provides only a partial list of specifications. It is rec-

ommended that you request complete drawings and specifications

prior to purchasing or using the product.

■ RoHS Directive Compliance

Models that are indicated as being RoHS compliant are free of the

following six substances.

Lead:

1,000 ppm max.

Mercury:

1,000 ppm max.

Cadmium:

100 ppm max.

Hexavalent chromium:

1,000 ppm max.

PBB:

1,000 ppm max.

PBDE:

1,000 ppm max.

cover

Operating body

R1 min

255

MAX

220

150

Preheating time:

60 to 120 s

Heating time:

40 s max.