Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 326

Glossary
Function
A function is one of four components found in the menu system. Functions are built-in programs
that perform specific tasks. Examples of functions include System Program Upload/Download
and Display System Program Name.
Harmonics
Harmonics are undesirable AC currents or voltages at integer multiples of the fundamental
frequency. The fundamental frequency is the lowest frequency in the wave form (generally the
repetition frequency). Harmonics are present in any non-sinusoidal wave form and cannot
transfer power on average.
Harmonics arise from non-linear loads in which current is not strictly proportional to voltage.
Linear loads like resistors, capacitors, and inductors do not produce harmonics. However, non-
linear devices such as diodes and silicon controlled rectifiers (SCRs) do generate harmonic
currents. Harmonics are also found in uninterruptable power supplies (UPSs), rectifiers,
transformers, ballasts, welders, arc furnaces, and personal computers.
Hexadecimal digits
Hexadecimal (or "hex") digits are the "numerals" used to represent numbers in the base 16
(hex) number system. Unlike the more familiar decimal system, which uses the numerals 0
through 9 to make numbers in powers of 10, the base 16 number system uses the numerals
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F to make numbers in powers of 16.
Historic log
The historic log is a troubleshooting/diagnostic tool of the control. The historic log continuously
logs drive status, including the drive state, internal fault words, and multiple user-selectable
variables. This information is sampled every slow loop cycle of the control (typically 450 to 900
times per second). If a fault occurs, the log is frozen a predefined number of samples after the
fault event, and data samples prior to and after the fault condition are recorded to allow post-
fault analysis. The number of samples recorded are user-selectable via the control, as well as
the option to record the historic log within the VFD event log.
Host Simulator
see Tool Suite definition.
I/O
I/O is an acronym for input/output. I/O refers to any and all inputs and outputs connected to a
computer system. Both inputs and outputs can be classified as analog (e.g., input power, drive
output, meter outputs, etc.) or digital (e.g., contact closures or switch inputs, relay outputs,
etc.).
326
NXGpro Communication
Function Manual, AB, A5E33486415A