If peak current remains elevated after adjustments, what should be checked?

• A. The cooling system
• B. The control circuitry
• C. The drive belt
• D. The lubrication system

Answer: (B)

When peak current stays high after you’ve made adjustments, the issue is most often in the control system that regulates excitation and voltage. The automatic voltage regulator and its sensing/feedback paths control how much field current is supplied to the exciter. If the sensing lines are damaged, the regulator is miscalibrated, or a component in the excitation circuit (like a thyristor/SCR, transistor, or relay) is faulty, the regulator can push excess excitation. That increases the magnetic field, drives voltage higher than intended, and keeps the current draw elevated even after adjustments.

So, focus on the control circuitry: inspect the automatic voltage regulator, verify sensor connections and leads, check calibration and setpoints, look for a sticking or failed relay, and test the excitation path for faults. Ensure proper grounding and wiring integrity. The other subsystems—cooling, mechanical drive, lubrication—affect temperature and mechanical conditions, not the electrical regulation loop, so they’re less likely to be the direct cause of persistently elevated peak current after adjustments.