Building Automation
Industrial Automation
Power Automation & Safety
Bangladesh Distributor
Question
What is pretravel (PT)?
Answer
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.
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