D-M9BWNII datasheet(92/92 Pages) ETC

92 / 92 page

Caution

D-B3 Series

Specific Product Precautions

Be sure to read this before handling the products.

Refer to back page 50 for Safety Instructions and pages 8 to 12 for Auto Switch Precautions.

1. Use the reed switch within the operating

range.

Take precautions about the ambient temperature because using

the reed switch beyond the operating range may affect its internal

electronic parts and sealing construction, causing abnormalities to

the service life of the contact, as well as operation and waterproof

performance of the switch.

Also, the maximum temperature of the environment where the

switch is used must be fully understood before operation is started

because the temperature of the environment where the auto

switch is installed may experience some changes after operation is

started due to factors other than air temperature such as influence

of radiation heat from the heat source, air circulation or heat

conduction.

2. Take precautions about the environment

where the auto switch is installed.

If conditions (water splashes, time, temperature) beyond the

normal ranges can be applied to the auto switch, use the auto

switch in an environment where it will not be directly exposed to

water splashes at a high temperature by installing a cover to

protect the entire auto switch, as long as it is possible. The

grommet type auto switch has a construction that will protect its

internal parts against water splashes at the normal temperature.

However, if the conditions (water splashes, time, temperature)

exceed the normal ranges, they may adversely affect the auto

switch internal insulation performance.

Also, confirm the applicability of the auto switch in the environment

because extreme heat cycles or a long-term high humidity may

cause functional deterioration of the auto switch protection

construction.

In principle, the terminal conduit type must be used in an

environment with no exposure to humidity or water because at

high temperatures, it may become impossible to achieve sufficient

waterproof effect due to deformation of lead wire sealant

depending on the heat resistance of the lead wire and cable

clamp.

3. Visibility of an indicator light

Because the auto switch uses light emitting diodes and neon bulbs

for display, continuous operation at a high temperature may cause

changes in characteristics of the entire display circuit. Also, the

transparency of the display window on the body may change

depending on the characteristics of the resin.

Because of the above factors, lighting under high temperature may

become dark, causing decline of visibility.

However, there could be no problem in output of the signal itself

and its safety owing to adoption of the OFF-state lighting system.

4. Take precautions about leakage current.

According to the heat resistant characteristics of its parts, the auto

switch adopts the OFF-state lighting system (the indicator light

lights up when the reed switch contact is open and goes off when

the reed switch contact is closed).

Since the current for indicator lighting is running when the auto

switch is off, confirm the allowable leakage current of PLC etc.

before selecting the model.

If the leakage current of the indicator light becomes a problem for

the PLC operation, select a model without an indicator light.

5. Keep the lead wire length as short as possi-

ble.

If a long lead wire is used because of the conditions of the plant or

equipment where the switch is installed, malfunction in the reed

switch reset operation may occur due to premature damage to the

contact surface caused by the inrush current resulting from the line

flotation capacity and influence of the electric field created by the

power line near the wiring.

Therefore, the maximum wiring length should be kept at 100 m or

less.

Avoid wiring in proximity with the power line. Also, if the length of

wiring in use is extremely long (30 m or longer), schedule

replacement in periodical maintenance.

The basic guidelines for replacement are a total wiring length of

100 m between the load and the auto switch and 1 million cycles

of operation (at 120

°C , 100 VAC PLC load).

6. Install the auto switch at the center of the

operating range.

The operation range of the auto switch is set at approximately

double that of the standard type in consideration of the mounting

error when the detection position is set. However, this range is

subject to change with the temperature. Although the variation in

the operating range differs with the cylinder on which the auto

switch is mounted, a temperature change of 100

°C will roughly

result in the maximum of 20% reduction in the overall operation

range.

(Approximately 2 mm variation at the position where the auto

switch usually turns on)

Therefore, install the auto switch at the center of the operating

range (stable range), while understanding the possible change in

the operating range and considering the stability of the auto switch

operation.

(Avoid installation of the auto switch at the boundary where the

auto switch turns on or off.)

7. Selection of applicable cylinders

The auto switch should be mounted on special cylinders (-X1184

series) because it is operated by magnets using heat resistant

material.

Consult SMC in advance for special applications in which current

cylinder cannot be used because, depending on the operating

environment, it is possible that special measures should be taken

or even the cylinder cannot be adapted.

8. Maintenance

After the auto switch is installed under high temperature, apply

additonal tightening peiodically to the auto switch mounting band.

The rubber lining of the auto switch mounting band may need

some time to adapt to the environment because of temperature

chages in the installation environment. Perform additoinal

tightening at a tightening torque of 2 to 3 N

⋅m while carefully

applying equal torque to both lifting screws.

9. Product upgrades

The product is subject to change without prior notice due to

upgrades.

1673

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