Glossary

American Wire Gauge

Ball Pass Frequency Inner Race — a bearing defect frequency calculated from bearing geometry and running speed.

Ball Pass Frequency Outer Race — a bearing defect frequency calculated from bearing geometry and running speed.

Ball Spin Frequency — a bearing defect frequency calculated from bearing geometry and running speed.

Condition based maintenance

NI Compact Reconfigurable I/O Controller.

A device used to measure alternating current (AC).

Direct Current

Distributed Control System

Electrical Signature Analysis (ESA) is a permanently installed, non-intrusive, online monitoring system that uses three-phase voltage and current signals to detect potential faults and anomalies.

A method for converting a signal into its frequency components, allowing for a better analysis of that signal.

Full Load Amps — the motor current at rated load, as specified on the nameplate.

Fundamental Train Frequency — a bearing defect frequency calculated from bearing geometry and running speed.

InsightCM™ is application software for condition monitoring with full access to waveforms, multiple sensor technology inputs, enterprise software connectivity, and analytics packages.

input/output

Lockout/Tagout

Motor Control Center

National Electrical Manufacturers Association

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.

Predictive maintenance

A type of instrument transformer used in power systems to reduce high voltages to safer, lower levels for measurement and protection purposes.

The difference between the synchronous speed and the actual rotor speed of an induction motor, expressed as a fraction of synchronous speed.

A variable that changes with time, usually representing a voltage or current. Waveforms are graphed with time on the horizontal axis.