| 摘要 |
The tendency of a motor-driven actuator 1 driving against a dynamic (non-frictional) load to return upon reaching the limit switch 22 sufficiently to again close the limit switch and create a persistent oscillation at the limit position can be prevented by placing a positive temperature coefficient thermistor across the limit switch involved. Such loads typically arise in actuators having spring-driven return capability, and can also arise when positioning air dampers and other loads where the actuator force is opposed by a spring or gravity. <IMAGE> |
