Limit switches are generally not recommended to be kept in the open state for a long time, mainly for safety and reliability considerations. The following are the specific reasons:
Security risk
If the limit switch remains in the open state for a long time, it may cause the equipment or machinery to continue running after exceeding the preset stroke, increasing the risk of collision, damage or injury to personnel.
Reliability issue
The normally closed contact is closed in the initial state. If the switch malfunctions (such as the contact disconnecting), an alarm can be triggered or the operation can be stopped immediately through the circuit opening, which is convenient for timely detection of faults. If the normally open contact malfunctions, the abnormality may not be detected immediately.
Maintenance suggestions
It is recommended to regularly check the contact status and mechanical components of the limit switch to ensure their normal function. If any abnormality is found, it should be replaced or repaired in time.
