🔍 Key Concepts

• Motor overload (OL) protection vs. limit switches (LSC/LSO) and what each one senses • What happens electrically to a motor when the door is driven against an obstruction or cannot travel further • How position-sensing devices differ from current/torque-sensing protection in this circuit

💭 Think About

• Trace the power path feeding the door motor and identify which device will react if the motor keeps drawing high current but the door does not move to the final limit position. • Compare the function of LSC and LSO on the diagram: under what condition do they change state, and would that condition be met if the door is jammed before reaching the designed closed position? • Think about what physically changes when the door is wedged: is it the door’s position, the motor’s current, or both, and which component in the schematic is designed to respond automatically to that change?

✅ Before You Answer

• Identify on the diagram where OL, LSC, and LSO are located relative to the door motor and the power supply lines. • Verify which device trips based on overcurrent/overload rather than door position, and would therefore act even if the limit switch never operates. • Confirm that momentary push buttons require manual operation, while the question is asking specifically about an automatic stop condition.