FAQ No. FAQ02268
Question
What is direct opening force (DOF)?
Answer
Refer to the following table of terms for operating characteristics.
|
Operating Status | |
 |
|
Classification |
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. |
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 are specified to ensure that the direct
opening mechanism (forcibly opened contacts) functions correctly.
Other Safety Limit Switch
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