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Auto Switch Precautions 2
Be sure to read before handling.
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Do not drop, bump, or apply excessive impacts (300 m/s
2
or
more for reed switches and 1000 m/s
2
or more for solid state
switches) while handling. Although the body of the switch may
not be damaged, the inside of the switch could be damaged
and cause a malfunction.
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lead wires.
Never carry a cylinder by its lead wires. This may not only
cause broken lead wires, but it may cause internal elements of
the switch to be damaged by the stress.
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torque.
When a switch is tightened beyond the torque range, the
mounting screws, mounting bracket or switch may be
damaged. Tightening below the range of tightening torque
may cause the switch to slip out of position. (Refer to pages
12 through 17 for detailed auto switch specifications.)
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range.
Adjust the mounting position of an auto switch so that the
piston stops at the centre of the operating range (the range in
which a switch is ON). (The mounting position shown in a
catalogue indicates the optimum position at stroke end.) If
mounted at the end of the operating range (around the border-
line of ON and OFF), operation will be unstable.
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Warning
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<Reed switches>
If the power is turned on with a load in a short circuited condi-
tion, the switch will be instantly damaged because of excess
current flow into the switch.
<Solid state switches>
D-J51 and all models of PNP output type switches do not have
built-in short circuit protection circuits. As in the case of reed
switches, if loads are short circuited, the switches will be
instantly damaged.
Take special care to avoid reverse wiring with the brown [red] power
supply line and the black [white] output line on 3-wire type switches.
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<Reed switches>
24 VDC switch with indicator light has polarity. The brown
[red] lead wire or terminal No. 1 is (+) and the blue [black]
lead wire or terminal No. 2 is (–).
1) If connections are reversed, the switch will still operate,
but the light emitting diode will not light up.
Also note that a current greater than the maximum specified
will damage a light emitting diode and make it inoperable.
Applicable models: D-A53, A54, D-Z73
2) Note however, in the case of 2-colour display type auto
switch (A59W), if the wiring is reversed, the switch will be
in a normally ON condition.
<Solid state switches>
1) Even if connections are reversed on a 2-wire type switch,
the switch will not be damaged because it is protected by
a protection circuit, but it will remain in a normally ON
state. However, it is still necessary to avoid reversed
connections since the switch will be damaged if a load
short circuits in this condition.
2) Even if (+) and (–) power supply line connections are
reversed on a 3-wire type switch, the switch will be
protected by a protection circuit. However, if the (+) power
supply line is connected to the blue [black] wire and the
(–) power supply line is connected to the black [white]
Wiring
Lead wire colour changes
Old
Red
Black
New
Brown
Blue
Output (+)
Output (–)
2-wire
Old
Red
Black
White
New
Brown
Blue
Black
Power supply (+)
Power supply GND
Output
3-wire
Old
Red
Black
White
Yellow
New
Brown
Blue
Black
Orange
Power supply (+)
Power supply GND
Output
Diagnostic
output
Solid state with diagnostic
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Old
Red
Black
White
Yellow
New
Brown
Blue
Black
Orange
Power supply (+)
Power supply GND
Output
Latch type
diagnostic output
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Lead wire colours of SMC switches have been changed in
order to meet NECA Standard 0402 for production beginning
September, 1996 and thereafter. Please refer to the tables
provided.
Special care should be taken regarding wire polarity during the
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wires.
Broken lead wires will result from repeatedly applying bending
stress or stretching force to the lead wires.
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If the power is turned on when an auto switch is not connected
to a load, the switch will be instantly damaged because of
excess current.
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Be certain that there is no faulty wiring insulation (contact with
other circuits, ground fault, improper insulation between
terminals, etc.). Damage may occur due to excess current
flow into a switch.
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Wire separately from power lines or high voltage lines, avoid-
ing parallel wiring or wiring in the same conduit with these
lines. Control circuits including auto switches may malfunction
due to noise from these other lines.
Wiring
Warning
Warning
Series
CHS
32