NEIEP Elevator Cab Assembly and Door Operators (530) Practice Exam

When motor voltage is present at the door motor terminals but not at the car, this typically indicates an interruption in the electrical path necessary for the system to function properly. An open travel cord, which is responsible for carrying power or control signals from the car to the door operator, would break this connection. Since the voltage is available at the motor terminals but not reaching the door, it suggests that the travel cord is not completing the circuit.

In elevator systems, the travel cord is crucial for communication and power delivery. If it is severed or malfunctioning, it could prevent the door operator from receiving the voltage it needs to operate, even though the source is intact. This situation highlights why verifying the integrity of the travel cord is essential when diagnosing door operation issues in elevators.