-6-
No.D-
※
S-OMI0002-B
Auto Switch Common Precautions
Design and Selection
Warning
(1) Check the specifications.
If the auto switch is used with an excessive load or used outside of the specifications, it may cause damage or
malfunction.
The product cannot be guaranteed if is used outside of the specification range.
(2) Caution for use in an interlock system.
When an auto switch is used in an interlock system which requires high reliability, provide a double interlock system,
for example a mechanical protection system, for extra safety, or by also using another switch (sensor) together with
the auto switch.
Check the product regularly in order to confirm normal operation.
(3) Do not disassemble, modify (including changing the printed circuit board) or repair.
An injury or failure can result.
Caution
(1) Pay attention to the length of time the auto switch will operate at an intermediate stroke position.
When an auto switch is placed at an intermediate stroke position, and a load is driven during the time when the piston
passes, the auto switch will operate, but if the piston speed is too great, the operating time will be shortened, and the
load may not operate correctly.
The maximum piston speed is:
Auto switch operating range [mm]
V [mm/s] =
Load operating time [ms]
×1000
(2) Take precautions when multiple actuators are used close together.
When using two or more actuators with auto switches in close proximity to each other, maintain a minimum separation
distance of at least 40 mm. (If the separation distance is specified for the actuator series, then use that value).
The auto switches may malfunction due to magnetic field interference.
Use of a magnetic screen plate (MU-S025) or commercially available magnetic screening tape can reduce the
interference of magnetic fields.
(3) Provide sufficient space for maintenance.
When designing an application, allow sufficient clearance for maintenance and inspection.
(4) Never mount the actuator with auto switch in a location that will be used as a footrest.
The product may be damaged if excessive force is applied by stepping or climbing onto it.
(5) Design the circuit to prevent reverse current during open circuit conditions or when the product is forced to
operate for functional checks.
Reverse current can cause product damage or malfunction.
(6) Precautions for mounting an auto switch
When n number of auto switches is specified for mounting, this indicates the maximum number of auto switches
based on the physical dimensions of the actuator.
The detection distance varies depending on the auto switch mounting structure and the auto switch body dimensions.
For this reason, the switch may not always be mounted at the required detection distance or at the required position.
(7) Limitations of the detection position.
There will be mounting positions or surfaces where the auto switch cannot be mounted due to physical interference
(e.g. rear side of the foot bracket), depending on the mounting conditions of the actuator.
Select an auto switch after confirming that the switch mounting position does not interfere with the mounting bracket
(e.g. trunnion, reinforcement ring).
