Table of Contents
Advertisement
Glossary of Terms
Perfect Harmony GENIII/e User's Manual
Debug Tool - see ToolSuite definition.
A
DC link - The DC link is a large capacitor bank between the converter and inverter section of the drive. The DC link,
along with the converter, establishes the voltage source for the inverter.
De Morgan's Theorem - The duality principal of Boolean algebra used to convert system logic equations into sum-
of-products notation.
Downloading - Downloading is a process by which information is transmitted from a remote device (such as a PC) to
the drive. The term "downloading" implies the transmission of an entire file of information (e.g., the system program)
rather than continued interactive communications between the two devices. The use of a PC for downloading requires
special serial communications software to be available on the PC, which may link to the drive via RS232 or through
the Host Simulator via an ethernet connection.
DRCTRY - Directory file for system tokens and flags used in the compilation of system programs. It provides a
direct lookup table of ASCII names to internal ID numbers. It also identifies whether the flag is a word or bit-field,
and also whether it can be used as an input or output only, or can be used for both.
Drive - The term "drive" refers to the power conversion equipment that converts utility power into power for a motor
in a controlled manner.
ELV - ELV is an acronym for extra low voltage, and represents any voltage not exceeding a limit that is generally
accepted to be 50 VAC and 120 VDC (ripple free).
EMC - EMC is an acronym for electromagnetic compatibility–the ability of equipment to function satisfactorily in its
electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that
environment.
ESD - ESD is an acronym for electrostatic discharge. ESD is an undesirable electrical side effect that occurs when
static charges build up on a surface and are discharged to another. When printed circuit boards are involved, impaired
operation and component damage are possible side effects due to the static-sensitive nature of the PC board
components. These side effects may manifest themselves as intermittent problems or total component failures. It is
important to recognize that these effects are cumulative and may not be obvious.
Fault log - Fault messages are saved to memory so that the operator may view them at a later time. This memory
location is called the fault log. The fault log lists both fault and alarm messages, the date and time that they occurred,
and the time and date that they are reset.
Faults - Faults are error conditions that have occurred in the Perfect Harmony system. The severity of faults vary.
Likewise, the treatment or corrective action for a fault may vary from changing a parameter value to replacing a
hardware component such as a fuse.
Flash Card - Non-volatile memory storage device for the NXG control. It stores the drive program, system program,
logs, parameters, and other related drive files.
FPGA - Field Programmable Gate Array. An FPGA is an integrated circuit that contains thousands of logic gates.
Function - A function is one of four components found in the Perfect Harmony 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
s s s s
A-2
A1A19000405A: Version 1.3
Advertisement
Table of Contents
