Design and Selection
Warning
1. Check the specifi cations.
Read the specifi cations carefully and use this product appropriately.
The product may be damaged or malfunction if it is used outside the
range of specifi cations of current load, voltage, temperature or impact.
2. Cautions for use in an interlock circuit
When an auto switch is used for an interlock signal requiring high
reliability, devise a double interlock system to avoid trouble by
providing a mechanical protection function, or by also using
another switch (sensor) together with the trimmer auto switch.
Also, perform periodic maintenance and confi rm proper operation.
Caution
1. Take precautions when multiple cylinders are used
close together.
When 2 or more cylinders with trimmer auto switches are used in
close proximity, maintain a minimum actuator interval of 40 mm
or more. (When the allowable interval is indicated for each
cylinder series, use the specified values.) Magnetic field
interference may cause the trimmer auto switches to malfunction.
2. Keep the wiring as short as possible.
Use a wire 3 m or shorter between the sensor and amplifi er. If the
sensor cable length exceeds 3 m, the CE marking does not apply
to the auto switch. Although wire length of power supply/output
cable should not affect switch function, use a wire 100 m or shorter.
3. Take precautions for the internal voltage drop of the switch.
Auto switches may not operate properly depending on the
connected equipment.
4. Take measures for rotational stoppage of the piston rod.
Take measures for rotational stoppage of the piston rod when
designing by guide etc. Or use non-rotating type SMC
products. The operation may be unstable.
Mounting and Adjustment
Caution
1. Do not drop or bump.
Do not drop, bump or apply excessive impacts (980 m/s
2
or
more for sensor unit and 98 m/s
2
or more for amplifier unit)
while handling. Although the trimmer auto switch body may not
be damaged, the inside of the trimmer auto switch could be
damaged and cause a malfunction.
2. Refer to the Operation Manual for how to adjust/set.
Wiring
Caution
1. Avoid repeatedly bending or stretching lead wires.
Broken lead wires will result from applying bending stress or
stretching forces to the lead wires.
2. Be sure to connect the connector for sensor to the
amplifi er before power is applied.
3. Do not allow short circuit of loads.
Output is automatically stopped when the protection circuit is
working, as the output unit registers any excess current fl ow, if
loads are short circuited. Should this occur, shut off the power
supply, remove the cause of this excess current flow and
switch on the power again. Take special care to avoid reverse
wiring between the power supply line (brown) and the output
line (black, white).
Wiring
Caution
4. Avoid incorrect wiring.
If the connections are reversed (power supply line + and power
supply line –), the trimmer auto switches will be protected by a
protection circuit. However, if the power supply line (–) is
connected to the black, white wire, the trimmer auto switches
will be damaged.
Operating Environment
Warning
1. Never use in an atmosphere with explosive gases.
The structure of trimmer auto switches is not designed to
prevent explosion. Never use in an atmosphere with an
explosive gas since this may cause a serious explosion.
Caution
1. Do not use in an area where a magnetic fi eld is generated.
Trimmer auto switches will malfunction or magnets inside
actuators will become demagnetized.
2. Do not use in an environment where the trimmer
auto switch will be continually exposed to water.
Although the sensor units of trimmer auto switches satisfy the
IEC standard IP67 structure, do not use trimmer auto switches
in applications where continually exposed to water splash or
spray. Poor insulation or swelling of the potting resin inside
trimmer auto switches may cause a malfunction. (Amplifi er unit
D-RNK and RPK: IP40)
3. Do not use in an environment with oil or chemicals.
Please consult with SMC if trimmer auto switches will be used
in an environment with coolant, cleaning solvent, various oils or
chemicals. If trimmer 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.
4. Take measures against freezing when operating at
5°C or less.
Maintenance
Warning
1. Perform the following maintenance periodically in
order to prevent possible danger due to unexpected
trimmer auto switch malfunction.
1) Secure and tighten trimmer auto switch mounting screws.
If screws become loose or the mounting position is
dislocated, retighten them after readjusting the mounting
position.
2) Confi rm that there is no damage to lead wires.
To prevent faulty insulation, replace trimmer auto switches
or repair lead wires, etc., if damage is discovered.
Other
Caution
1. Please consult with SMC concerning water resistance,
elasticity of lead wires, and usage at welding sites, etc.
Be sure to read before handling. Refer to back cover for Safety Instructions. For Auto
Switch Precautions, refer to “Handling Precaution for SMC Products” and the
Operation Manual on SMC website, http://www.smcworld.com
Trimmer Auto Switch
Specifi c Product Precautions
8
