What torque range is used as the NR power-on cautionary value?

What torque range is used as the NR power-on cautionary value?

• A. 95%
• B. 101-103%
• C. 95-101%
• D. 108% (10 sec)

Answer: (C)

During NR power-on, torque should stay close to the nominal value as the rotor comes up to speed. The cautionary range of 95-101% is used because it covers normal variation and instrument tolerance, while still signaling if torque drifts outside that window. A single value like 95% misses the potential overshoot above 101%, and a range like 101-103% ignores the lower bound of acceptable operation. The 108% (10 sec) figure is a separate transient over-torque limit, not the general caution range.

During NR power-on, torque should stay close to the nominal value as the rotor comes up to speed. The cautionary range of 95-101% is used because it covers normal variation and instrument tolerance, while still signaling if torque drifts outside that window. A single value like 95% misses the potential overshoot above 101%, and a range like 101-103% ignores the lower bound of acceptable operation. The 108% (10 sec) figure is a separate transient over-torque limit, not the general caution range.