What torque range defines NR power-on continuous operation?

What torque range defines NR power-on continuous operation?

• A. 101-103%
• B. 108% (10 sec)
• C. 90-110%
• D. 103% max

Answer: (A)

Power-on continuous NR means keeping the rotor speed within a tight tolerance around its nominal value while power is applied. That tolerance is 101-103% of NR. This small band accounts for normal variations in load, temperature, and gusts, keeping the rotor from drifting too far above or below the desired speed. A short-term overspeed limit of 108% for 10 seconds exists for handling transient conditions, but not for continuous operation. A range like 90-110% is too broad for continuous operation, as it allows underspeed and larger fluctuations. A single maximum like 103% would imply no lower tolerance. So the continuous power-on range is 101-103%.

Power-on continuous NR means keeping the rotor speed within a tight tolerance around its nominal value while power is applied. That tolerance is 101-103% of NR. This small band accounts for normal variations in load, temperature, and gusts, keeping the rotor from drifting too far above or below the desired speed.

A short-term overspeed limit of 108% for 10 seconds exists for handling transient conditions, but not for continuous operation. A range like 90-110% is too broad for continuous operation, as it allows underspeed and larger fluctuations. A single maximum like 103% would imply no lower tolerance. So the continuous power-on range is 101-103%.