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Perfect Harmony GENIII/e User's Manual
Glossary of Terms
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
A
to make numbers in powers of 16.
Historic log - The historic log is a troubleshooting/diagnostic tool of the Perfect Harmony NXG 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 NXG 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 NXG control, as well as the option to record the historic log within the VFD event log.
Host Simulator - see ToolSuite 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.).
IGBT - IGBT is an acronym for Insulated Gate Bipolar Transistors. IGBTs are semiconductors that are used in the
Perfect Harmony drives to provide reliable, high-speed switching, high-power capabilities, improved control
accuracy, and reduced motor noise.
Induction motor - An induction motor is an AC motor that produces torque by the reaction between a varying
magnetic field (generated in the stator) and the current induced in the coils of the rotor.
Intel hex - Intel hex refers to a file format in which records consist of ASCII format hexadecimal (base 16) numbers
with load address information and error checking embedded.
Inverter - The inverter is a portion of the drive that changes DC voltage into AC voltage. The term "inverter" is
sometimes used mistakenly to refer to the entire drive (the converter, DC link, and inverter sections).
Jerk rate - Jerk rate is the time it takes for the drive to go from one acceleration rate to another. The jerk rate is a
programmable parameter used to limit the rate of change of the acceleration. Jerk rate has no effect if acceleration is
constant. Jerk rate helps to prevent small overshoots and provides the "S-curve" (speed / timeplot) characteristic as
the speed setpoint is reached.
Jog mode - Jog mode is an operational mode that uses a pre-programmed jog speed when a digital input
(programmed as the jog mode input) is closed.
Jumpers - Jumper blocks are groups of pins that can control functions of the system, based on the state of the
jumpers. Jumpers (small, removable connectors) are either installed (on) or not installed (off) to provide a hardware
switch.
Ladder logic - (Also Ladder Diagram) A graphical representation of logic in which two vertical lines, representing
power, flow from the source on the left and the sink on the right, with logic branches running between, resembling
rungs of a ladder. Each branch consists of various labeled contacts placed in series and connected to a single relay
coil (or function block) on the right.
Loss of signal feature - The loss of signal feature is a control scheme that gives the operator the ability to select one
of three possible actions in the event that the signal from an external sensor, configured to specify the speed demand,
is lost. Under this condition, the operator may program the drive (through the system program) to (1) revert to a fixed,
pre-programmed speed, (2) maintain the current speed, or (3) perform a controlled (ramped) stop of the drive. By
default, current speed is maintained.
LVD - LVD is an acronym for Low Voltage Directive, a safety directive in the EU.
Lvl RH - This term refers the two security fields associated with each parameter of the system. These fields allow the
operator to individually customize specific security features for each menu option (submenu, parameter, pick list, and
function). These fields are shown in parameter dumps and have the following meanings. Lvl is the term for the
security level. Setting R=1 blocks parameter change, and setting H=1 hides the menu option from view until the
appropriate access level has been activated.
s s s s
A1A19000405A: Version 1.3
A-3
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