A motor controlled by a start/stop station runs slowly and then trips the overloads. This is most likely a power problem.

A motor controlled by a start/stop station runs slowly and then trips the overloads. This is most likely a power problem.

• A. Control
• B. Protection
• C. Grounding
• D. Power

Answer: (D)

Power problems show up when a motor can’t get the voltage it needs to develop full torque. If the supply voltage is low or power quality is poor, the motor can’t reach its proper speed under load. To compensate, it draws more current to try to develop torque, which makes it heat up and trips the overload protection. The start/stop station is just a control device; it doesn’t by itself cause the motor to pull more current, so the symptom points to the electrical supply rather than control, grounding, or protection issues.

Power problems show up when a motor can’t get the voltage it needs to develop full torque. If the supply voltage is low or power quality is poor, the motor can’t reach its proper speed under load. To compensate, it draws more current to try to develop torque, which makes it heat up and trips the overload protection. The start/stop station is just a control device; it doesn’t by itself cause the motor to pull more current, so the symptom points to the electrical supply rather than control, grounding, or protection issues.