Specifications
Series CU
Auto Switch Precautions 2
Be sure to read before handling.
1. Do not drop or bump.
Do not drop, bump, or apply excessive impacts (300m/s² or
more for reed switches and 1000m/s² 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.
2. Do not carry a cylinder by the auto switch
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.
3. Mount switches using the proper tightening
torque.
When a switch is tightened beyond the range of tightening
torque, the mounting screws, mounting bracket, or switch may
be damaged.
On the other hand, tightening below the range of tightening
torque may allow the switch to slip out of position.
4. Mount a switch at the center of the operating
range.
Adjust the mounting position of an auto switch so that the
piston stops at the center of the operating range (the range in
which a switch is on). (The mounting positions shown in the
catalog indicate the optimum position at the stroke end.) If
mounted at the end of the operating range (around the
borderline of on and off), the operation will be unstable.
Mounting and Adjustment
Warning
5. Do not allow short circuiting of loads.
<Reed switches>
If the power is turned on with a load in a short circuited
condition, the switch will be instantly damaged because of
excess current flow into the switch.
<Solid state switches>
D-F9(V), D-F9W(V) and all models of PNP output type
switches do not have built-in short circuit protection circuits. If
loads are short circuited, the switches will be instantly
damaged, as in the case of reed switches.
∗ 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.
6. Avoid incorrect wiring.
<Reed switches>
A 24VDC switch with indicator light has polarity. The brown [red]
lead wire is (+), and the blue [black] lead wire 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
one will damage a light emitting diode and make it
inoperable.
Applicable models: D-A93, D-A93V
<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 could be damaged by a load short circuit in
this condition.
∗ 2) Even if (+) and (–) power supply line connections are
reversed on a 3-wire type switch, the switch will still 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] wire, the
switch will be damaged.
Wiring
1. Avoid repeatedly bending or stretching lead
wires.
Broken lead wires will result from repeatedly applying bending
stress or stretching force to the lead wires.
2. Be sure to connect the load before power is
applied.
<2-wire type>
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.
3. Confirm proper insulation of wiring.
Be certain that there is no faulty wiring insulation (such as
contact with other circuits, ground fault, improper insulation
between terminals, etc.). Damage may occur due to excess
current flow into a switch.
4. Do not wire in conjunction with power lines
or high voltage lines.
Wire separately from power lines or high voltage lines, avoiding
parallel wiring or wiring in the same conduit with these lines.
Control circuits containing auto switches may malfunction due
to noise from these other lines.
Wiring
Warning
Warning
∗ Lead wire color 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 output
Old
Red
Black
White
Yellow
New
Brown
Blue
Black
Orange
Power supply (+)
Power supply
GND
Output
Latch type
diagnostic output
Solid state with latch
type diagnostic output
Lead wire colors 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
time that the old colors still coexist with the new colors.
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