SMC Networks CDUJB10-20D, Manual

Page: 24 / 28

Series
CUJ
Auto Switch Precautions 3
Be sure to read before handling.
Warning
Maintenance
Other
Warning
1. Perform the following main-
tenance periodically in order
to prevent possible danger
due to unexpected auto
switch malfunction.
1) Keep switch mounting screws
securely tightened.
If screws should become loose or
switches should slip from their
original mounting position, retight-
en the screws after readjusting the
mounting position.
2) Confirm that there is no damage
to lead wires.
To prevent faulty insulation,
replace switches or repair lead
wires if damage is discovered.
1. Consult SMC concerning
water resistance, flexibility
of lead wires, and usage at
welding sites, etc.
21
Warning
1. Never use in an atmosphere
of explosive gases.
The construction of auto switches is not
intended to prevent explosion. Never
use in an atmosphere with an explosive
gas since this may cause a serious
explosion.
2. Do not use in an area where
a magnetic field is gener-
ated.
Auto switches will malfunction or
magnets inside cylinders will become
demagnetized.
3. Do not use in an environ-
ment where the auto switch
will be continually exposed
to water.
Although switches, except for a few
models, conform to IEC standard IP67
construction (JIS C 0920: watertight
construction), they should not be used
in applications where they are continu-
ally exposed to water splash or spray.
Poor insulation or swelling of the potting
resin inside switches may cause mal-
function.
4. Do not use in an environ-
ment with oil or chemicals.
Consult SMC if auto switches will be
used in an environment with coolant,
cleaning solvent, various oils or chem-
icals. If auto switches are used under
these conditions for even a short time,
they may be adversely affected by
improper insulation, malfunction due to
swelling of the potting resin, or
hardening of the lead wires.
Warning
5. Do not use in an environ-
ment with temperature
cycles.
Consult SMC if switches are used
where there are temperature cycles
other than normal air temperature
changes, as they may be adversely
affected internally.
6. Do not use in locations
where surge is generated.
<Solid state switch>
When there are units (solenoid type
lifter, high frequency induction furnace,
motor, etc.) that generate a large
amount of surge in the area around
cylinders with solid state auto switches,
this may cause deterioration or damage
to the switche's internal circuitry. Avoid
sources of surge generation and crossed
lines.
7. Avoid accumulation of iron
waste or close contact with
magnetic substances.
When a large amount of ferrous waste
such as machining chips or spatter is
accumulated, or a magnetic substance
(something attracted by a magnet) is
brought into close proximity with an
auto switch cylinder, it may cause auto
switches to malfunction due to a loss of
the magnetic force inside the cylinder.
Operating Environment