Auto Switches Precautions
Design / Selectio
n
1. Confirm the specifications.
If the product is used with excess load applied or beyond the specification range, this may cause the
product to break or malfunction. We do not guarantee against any damage if the product is used outside
of the specification range.
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 auto switch.
Also, perform regular maintenance and confirm proper operation.
3. Do not attempt to disassemble, modify (including exchanging the printed circuit boards), or
repair the product.
An injury or failure can result.
1. Pay attention to the length of time that a switch is ON at an intermediate stroke position.
When an auto switch is placed at an intermediate position of the stroke and a load is driven
,
at the time
the piston passes the auto switch will operate, but if the speed is too great the operating time will be
shortened and the load may not operate properly.
The maximum piston speed is:
V(mm/s)=
×
1000
2. Take precautions when multiple rotary tables are used close together.
When multiple auto switch rotary tables are used in close proximity, magnetic field interference may
cause the auto switches to malfunction. Maintain a minimum cylinder separation of 40 mm. (When the
allowable interval is specified for each cylinder series, use the indicated value.)
The auto switches may malfunction due to interference from the magnetic fields.
Use of a magnetic screen plate (MU-S025) or commercially available magnetic screen tape can reduce
the interference of magnetic force.
3. Ensure sufficient clearance for maintenance activities.
When designing an application, be certain to allow sufficient clearance for maintenance.
4. Do not mount rotary table with the auto switch on a footing.
If work personnel gets on or puts the work personnel
’s foot on the footing accidentally, an excessive load
is applied to the rotary table, causing the rotary table to break.
5. Design the circuit so that any back-flow current does not flow in if a short-circuit trouble
occurs or forced operation is performed to check the operation.
If a back-flow current occurs, this may cause the switch to malfunction or break.
6. When multiple auto switches are required.
“n” indicates the number of auto switches which can be physically mounted on the rotary tables.
Detection intervals depends on the auto switch mounting structure and set position, therefore some
required interval and set positions may not be available.
7. Limitations on detectable position
There are positions or surfaces (bottom surface of the foot bracket, etc.) where the auto switch cannot
be mounted due to the physical interference depending on the rotary table mounting status or mounting
bracket. Select an appropriate auto switch setting position where the auto switch does not interfere with
the rotary table mounting bracket (trunnion or reinforcing ring) after checking it sufficiently.
-10-
Auto switch operating range (mm)
Load applied time (ms)
Warning
Caution
2020-10-13 10:36
DI987004
