LPAC is powered by which motor horsepower?

• A. 30 HP
• B. 60 HP
• C. 100 HP
• D. 5 HP

Answer: (B)

The LPAC, or Low-Pressure Air Compressor, must be driven by a motor that can deliver enough torque to spin the compressor through its operating range, including the surge during starting, so that the required amount of starting air and pressure is produced reliably. A mid-range motor rating is used because it provides enough power to meet the LPAC’s airflow and pressure needs without wasting energy or adding excessive stress on the drive system. If the motor is underpowered, the LPAC won’t reach the needed speed or pressure, and starting air may be insufficient. If the motor were much larger than necessary, it would waste electrical energy and incur extra cost and wear without providing proportional benefit. So the mid-range horsepower is the best balance for dependable LPAC performance.