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⑤
Pay attention to leakage current.
<Solid state switch / 2-wire type >
Current (leakage current) flows to the load to operate the internal circuit even when in the OFF state.
Operating current of load (OFF condition) > Leakage current
If the criteria given in the above formula are not met, it will not reset correctly (stays ON).Use a 3-wire
switch if this specification will not be satisfied.
Moreover, leakage current flow to the load will be “n” times larger when “n” auto switches are
connected in parallel.
⑥
Do not use a load that generates surge voltage.
If driving a load such as a relay that generates a surge voltage,
<Reed switch>
Use an auto switch with built-in contact protection circuit or use a contact protection box.
<Solid state switch>
Use a built-in surge absorbing element type device.
⑦
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 auto switch.
Also perform periodic maintenance and confirm proper operation.
⑧
Ensure sufficient clearance for maintenance activities.
When designing an application, be certain to allow sufficient clearance for maintenance.
⑨
When multiple auto switches are required.
“n” indicates the number of auto switches which can be physically mounted on the rotary actuators.
Detection intervals depends on the auto switch mounting structure and set position, therefore some
required interval and set positions may not be available.
⑩
Use the cylinder and auto switch in proper combination.
The auto switch is pre-adjusted to activate properly for an auto-switch-capable SMC cylinder/actuator.
If the auto switch is mounted improperly, used for another brand of cylinders/actuators or used after the
alternation of the machine installation, the auto switch may not activate properly.
Mounting / Adjustment
①
Do not drop or bump.
Do not drop, bump or apply excessive impacts (300m/s
2
or more for reed auto switches and 1000m/s
2
or more for solid state auto switches) while handling.
Although the body of the auto switch may not be damaged, the inside of the auto switch could be
damaged and cause 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.
Caution
2020-10-13 10:33
DI987004
