In troubleshooting reduced voltage starters, what should the voltage during the running stage be compared to?

In the running stage of reduced voltage starters, the voltage should be compared to the line voltage and is expected to be equal. This is because once the motor is in full operation after transitioning from the reduced voltage starting phase, it should draw the same voltage that is provided from the line to operate normally.

During the starting phase, reduced voltage starters temporarily limit the voltage supplied to the motor to minimize inrush current and mechanical stress. Once the motor reaches its rated speed and is fully operational, it should receive the full line voltage to ensure optimal performance, achieve the necessary torque, and avoid overheating.

This comparison is crucial in troubleshooting; if the voltage in the running stage is lower than expected, it could indicate issues such as a malfunctioning starter, poor connections, or other electrical problems. Conversely, if the voltage were higher, it could pose a risk of damage to the motor, and if it varies based on load, it could signal inconsistencies in the electrical supply or problems in the system design. Therefore, the correct understanding is that the voltage during the running stage is indeed expected to be equal to the line voltage for proper motor function.