What is the NR power-off continuous operation torque range?

What is the NR power-off continuous operation torque range?

• A. 90-110%
• B. 90%
• C. 110% max
• D. 101-103%

Answer: (A)

Understanding this concept means knowing how much torque the system can safely sustain continuously when it isn’t powered, expressed as a percentage of the rated torque. For NR power-off continuous operation, the allowable range is 90% to 110% of the rated torque. This symmetric band accounts for real-world variations in friction, temperature, and manufacturing tolerances while keeping the system within its thermal and mechanical limits. The lower bound prevents operating too far below the nominal capability, and the upper bound provides enough headroom for transient effects without overloading the design. A single value or a very narrow range wouldn’t capture the practical variations you’ll see in real units, so 90-110% is the correct, useful specification.

Understanding this concept means knowing how much torque the system can safely sustain continuously when it isn’t powered, expressed as a percentage of the rated torque. For NR power-off continuous operation, the allowable range is 90% to 110% of the rated torque. This symmetric band accounts for real-world variations in friction, temperature, and manufacturing tolerances while keeping the system within its thermal and mechanical limits. The lower bound prevents operating too far below the nominal capability, and the upper bound provides enough headroom for transient effects without overloading the design. A single value or a very narrow range wouldn’t capture the practical variations you’ll see in real units, so 90-110% is the correct, useful specification.