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WL-1A100P1

Limit Switches Limit Switch

OMRON Corporation 

Technical Guide for Limit Switches

• Unbalanced force must not be imposed on the actuator. Otherwise,

wear and tear on the actuator may result.

Incorrect

Correct

Dog

Roller

Dog

Roller

• With a roller actuator, the dog must touch the actuator at a right

angle. The actuator or shaft may deform or break if the dog touches

the actuator (roller) at an oblique angle.

Incorrect

Correct

Dog

Dog

• Make sure that the actuator does not exceed the OT (overtravel)

range, otherwise the Limit Switch may malfunction. When mounting

the Limit Switch, be sure to adjust the Limit Switch carefully while

considering the whole movement of the actuator.

Operating

body

PT (Pretravel)

Install a stopper.

70% of

rated OT

100% of

rated OT

FP (Free position)

OP (Operating position)

OT (Overtravel)

Optimum setting range

TTP (Total travel position)

Distance to the

optimum setting range.

Reference line

• The Limit Switch may soon malfunction if the OT is excessive.

Therefore, adjustments and careful consideration of the position of

the Limit Switch and the expected OT of the operating body are

necessary when mounting the Limit Switch.

Correct

Stopper

• Be sure to use the Limit Switch according to the characteristics of

the actuator.

If a roller arm lever actuator is used, do not attempt to actuate the

Limit Switch in the direction shown below.

Incorrect

• Do not modify the actuator to change the OP.

• With the long actuator of an Adjustable Roller Lever Switch, the

following countermeasures against lever shaking are

recommended.

1.Make the rear edge of the dog smooth with an angle of 15° to 30°

or make it in the shape of a quadratic curve.

2.Design the circuit so that no error signal will be generated.

3.Use a switch that is actuated in one direction only. (Alternatively,

set the Switch so that it is operated only in one direction.)

• With a bevel plunger actuator, make sure that the width of the dog

is wider than that of the plunger.

Incorrect

Correct

• When using a pin-plunger actuator, make sure that the stroke of the

actuator and the movement of the dog are located along a single

straight line.

Incorrect

Correct

Operating

body

Operating

body

http://www.ia.omron.com/

(c)Copyright OMRON Corporation 2007 All Rights Reserved.

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