|
Term |
Definition |
|---|---|
|
AWG |
American Wire Gauge |
|
BPFI |
Ball Pass Frequency Inner Race — a bearing defect frequency calculated from bearing geometry and running speed. |
|
BPFO |
Ball Pass Frequency Outer Race — a bearing defect frequency calculated from bearing geometry and running speed. |
|
BSF |
Ball Spin Frequency — a bearing defect frequency calculated from bearing geometry and running speed. |
|
CBM |
Condition Based Maintenance |
|
cRIO |
NI Compact Reconfigurable I/O Controller — the edge hardware device that acquires voltage and current signals in the ESA system. |
|
CT / Current Transformer |
An instrument transformer used to scale high primary current down to a safe secondary signal level for measurement. |
|
DC |
Direct Current |
|
DCS |
Distributed Control System |
|
ESA |
Electrical Signature Analysis — a permanently installed, non-intrusive, online motor monitoring system that uses three-phase voltage and current signals to detect potential faults and anomalies. |
|
FFT |
Fast Fourier Transform — an algorithm that converts a time-domain signal into its frequency-domain representation (amplitude versus frequency). |
|
FLA |
Full Load Amps — the motor current at rated load, as specified on the nameplate. |
|
FTF |
Fundamental Train Frequency — a bearing defect frequency calculated from bearing geometry and running speed. |
|
InsightCM™ |
Cutsforth's application software for condition monitoring, providing full access to waveforms, multiple sensor technology inputs, enterprise software connectivity, and analytics packages. |
|
I/O |
Input/Output |
|
LOTO |
Lockout/Tagout |
|
MCC |
Motor Control Center |
|
NEMA |
National Electrical Manufacturers Association |
|
Park Clarke |
A signal processing technique that transforms three-phase current signals onto two orthogonal axes (d–q), used in the ESA system to visualize current balance and detect stator faults. |
|
PdM |
Predictive Maintenance |
|
PT / Potential Transformer |
An instrument transformer used to reduce high bus voltage to a safe secondary signal level for measurement. |
|
RMS |
Root Mean Square — a method of expressing the effective amplitude of an AC signal. |
|
Slip Frequency |
The difference between the synchronous speed and the actual rotor speed of an induction motor, expressed as a fraction of synchronous speed. |
|
Waveform |
A variable that changes with time, typically representing a voltage or current. Waveforms are graphed with time on the horizontal axis. |