Equipment Faults, Diagnosis and Reporting
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A complete list of faults, electrical parameter discovered and energy efficiency information
can be seen below. Note that EEE stands for Effects on Energy Efficiency.
NORMAL The equipment is working as expected.
WATCH EXISTING FAULTS The operation of the equipment is NORMAL although there
are existing fault(s) within acceptable level(s). These faults should be checked for
verification and corrective action at the next scheduled maintenance but no later than
six (6) months.
Mechanical Fault Indications
Misalignment / unbalance. Check for Misalignment, unbalance, bearing, coupling,
and motor shaft.
EEE: Correct shaft alignment ensures the smooth, efficient transmission of power
from the motor to the driven equipment.
Transmission problem. Check for transmission element(s) coupling, driven
equipment, belt, pulley, gear box, and fan / pump impeller.
EEE: Efficiency is dependent on pulley size, driven torque, under or over belting, and
V belt design and construction. Efficiency deteriorates by as much as 5% over time if
slippage occurs.
Bearing Problem. Bearing(s) should be checked.
EEE: The presence of bearing defects often results in reduced efficiency, or even
severe damage, of the motor under consideration.
Looseness / Foundation. Check for loose motor foundation, loose motor
components, looseness or excessive tolerances in driven components.
EEE: Mechanical issues such as misalignment, physical looseness and imbalance not
only adversely affect a motor’s performance and longevity but also its efficiency.
Electrical Fault Indications
Stator related problem. Check for stator, short circuit, winding slackness, isolation
problems, and partial discharge.
EEE: Heating and increased resistance due to stator, rotor and other electrical faults
cause deteriorating conditions and reduced efficiency.
Rotor problem. Check for cracked or loose rotor / rotor bars.
PSD (Power Spectral Density) plot indicates abnormalities. Faults should be
identified by checking trends, PSD, and diagnostic help. Alternately email
artesis@artesis.com.
WATCH ELECTRICAL VALUES Electrical values are outside of their expected range. They
should be noted and watched to identify the cause.
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