Offline motor testing includes winding resistance balance, insulation resistance (IR/MegOhm), polarization index (PI), DC high potential (Step-Voltage/HiPot), and surge testing. Online testing is one of the only ways to verify whether rotor bars are broken or cracked. Correcting power quality or voltage issues can prolong the life of your equipment by reducing stress on the motor’s insulation. All of that boils down to determining the overall health of the motor relative to the running conditions of its environment. Online motor testing includes voltage level, voltage imbalance, voltage distortion, service factor, overcurrent, efficiency, rotor bar, operating point, torque ripple, load history, haystack, and operation condition tests. Ideally, you might incorporate both into your PdM program. On the other hand, maybe an offline (static) motor testing program is right for you. Maybe you want an online (dynamic) program. If you want to avoid unnecessary pit stops for repairs, you want to get a motor testing program in place. Motor testing should be a significant part of your predictive maintenance (PdM) plan because it provides critical information about the condition of your facility’s motors-info that might be hard to get otherwise. In addition, what is true of that car is true for your equipment as well. You might think of your operation like a NASCAR car-a complicated system with lots of moving parts.
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