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⑥
Avoid incorrect wiring.
<Reed switch>
A 24 VDC auto switch with indicator light has polarity. The brown lead wire or terminal No.1 is (+), and
the blue lead wire or terminal No.2 is (
－
).
1) If connections are reversed, an auto switch will operate, however, the light emitting diode will not light
up.
Also, take note that a current greater than that specified will damage a light emitting diode and it will
no longer operate.
Applicable model : D-A93V
<Solid state switch>
1) If connections are reversed on a 2 wire type auto switch, the auto switch will not be damaged if
protected by a protection circuit, but the auto switch will always stay in an ON state. However, it is still
necessary to avoid reversed connections, since the auto switch could be damaged by a load short
circuit in this condition.
2) If connections are reversed (power supply line + and power supply line
－
) on a 3-wire type auto switch,
the auto switch will be protected by a protection circuit. However, if the power supply line (+) is
connected to the blue wire and the power supply line (
－
) is connected to the black wire, the auto
switch will be damaged.
Operating Environment
①
Never use in an atmosphere of explosive gases.
The structure 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 generated.
Auto switches will malfunction or magnets inside cylinders/actuators will become demagnetized. (Please
consult with SMC if a magnetic field resistant auto switch can be used.)
③
Do not use in an environment where the auto switch will be continually exposed to water.
Although auto switches satisfy the IEC standard IP67 construction (JIS C 0920: waterproof
construction) except some models do not use auto switches in applications where continually exposed
to water splash or spray. Poor insulation or swelling of the potting resin inside auto switches may cause
malfunction.
④
Do not use in an environment with oil or chemicals.
Please consult with SMC if auto switches will be used in an environment with coolant, cleaning solvent,
various oils or chemicals. 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.
⑤
Do not use in an environment with temperature cycles.
Please consult with SMC if auto switches are used where there are temperature cycles other than
normal temperature changes, as there may be adverse effects inside the auto switches.
⑥
Do not use in an environment where there is excessive impact shock.
<Reed switch>
When excessive impact (300 m/s
2
or more) is applied to a reed auto switch during operation, the
contact point will malfunction and generate or cut off a signal momentarily (1 ms or less). Please consult
with SMC if a solid state auto switch can be used according to the environment.
Warning
2020-10-13 10:33
DI987004
