🔍 Key Concepts
• Use the off standard-frequency graph (right-hand chart) only, not the voltage chart.
• Look at how each performance curve (RPM, starting current, full load current, starting & breakdown torque) moves when frequency goes below 0% (to the left).
• Remember that a negative change in frequency on the x‑axis corresponds to operating below rated frequency.
💭 Think About
• On the frequency chart, when you move several percent left of 0 on the x-axis, which curve clearly shows a decrease in percent performance on the y-axis?
• For each answer choice, find its matching curve on the graph and ask: does that curve go up, down, or stay about the same as frequency decreases?
• Which option describes the quantity whose curve trends downward the most when frequency is reduced well below normal?
✅ Before You Answer
• Be sure you are reading the frequency (right) chart, not the voltage (left) chart.
• Confirm you are following the correct labeled curve for each choice (RPM, starting current, full load current, starting & breakdown torque).
• Check the sign: a line sloping down into negative values means the performance quantity is lower than normal at reduced frequency.