Industrial Automation
Industrial Automation | Europe

myKnowledge

Main > Product Type > Safety > Safety Limit Switches
Minimize Text   Default    Enlarge Text
 

Print
E-mail

What Is PreTravel (PT)?


Refer to the following table of terms for operating characteristics.

Operating Status
Feature Term Abbreviation Unit Definition
Force Operating
Force
OF N, Nm The force needed to be applied to the Actuator to move from the free position to the operating position.
Direct
Opening
Force
DOF
(See note 2.)
N, Nm The force needed to be applied to the Actuator to move from the operating position to the direct opening position.
Total
Travel
Force
TTF N, Nm The force needed to be applied to the Actuator to move from the free position to the total travel position.
Travel Pretravel PT mm, ° The travel distance or angle from the free position to the travel position of the Actuator.
Direct
Opening
Travel
DOT
(See note 2.)
mm, ° The travel distance or angle from the free position to the direct opening position of the Actuator.
Total
Travel
TT mm, ° The travel distance or angle of the Actuator from the free position to the total travel position.
Position Free
Position
FP mm, ° The Actuator position when no external force is applied.
Operating
Position
OP
(See note 1.)
mm, ° The position where the moving contact starts to open or close when an external force is applied to the Actuator.
Direct
Opening
Position
DOP
(See note 2.)
mm, ° The Actuator position when the moving contacts are directly open when an external force is applied to the Actuator.
Total
Travel
Position
TTP mm, ° The Actuator position when the Actuator has reached the stopper.

Note 1:
For slow-operating safety switches, the operating position (OP) and return position (RP) are almost identical.
 

Note 2:
The DOF, DOT, and DOP values were specified to ensure that the direct opening mechanism (forcibly opened contacts) functions correctly.
 

 

See Also:
 

 

 




Comments (View All Comments / Add Comment)

Related Articles
No related articles found.
Created 2009-03-06
Modified 2009-10-29
Views 2424

 

You are not logged in.