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Glossary of Terms
Perfect Harmony GENIII/e User's Manual
Manual mode - Manual mode is a control scheme of the Perfect Harmony in which the desired velocity of the drive
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is set manually by the operator. In local manual mode, the desired velocity is set using the up and down arrow keys on
the front keypad of the drive. In remote manual mode, the desired velocity is set using a potentiometer input (located
remotely from the drive) that is wired to the drive.
Memory - Memory is the working storage area for the Perfect Harmony drive that is a collection of RAM chips.
Microprocessor - A microprocessor is a central processing unit (CPU) that exists on a single silicon chip. The
microprocessor board is the printed circuit board on which the microprocessor is mounted. The NXG drive employs a
®
single-board computer with a Pentium
microprocessor.
NEMA 1 and NEMA 12 - NEMA 1 is an enclosure rating in which no openings allow penetration of a 0.25-inch
diameter rod. NEMA 1 enclosures are intended for indoor use only. NEMA 12 is a more stringent NEMA rating in
which the cabinet is said to be "dust tight" (although it is still not advisable to use NEMA 12 in conductive dust
atmospheres). The approximate equivalent IEC rating is IP52.
Normally closed (NC) - Normally closed refers to the contact of a relay that is closed when the coil is de-energized.
Normally open (NO) - Normally open refers to the contact of a relay that is open when the coil is de-energized.
OLTM - An acronym for Open Loop Test Mode - One of six control modes of the NXG drive.
OLVC - An acronym for Open Loop Vector Control, also known as Encoderless Vector Control. OLVC is a flux
vector control that is one of six control modes of the NXG drive. The drive computes the rotational speed of the rotor
and uses it for speed feedback.
OOS - OOS is an abbreviation for out of saturation - a type of fault condition in which a voltage drop is detected
across one of the IGBTs during conduction. This can indicate that the motor is drawing current too rapidly or in
excess.
OR - OR is a logical Boolean function whose output is true if any of the inputs is true. In SOP notation, OR is
represented as "+".
Parameter - A parameter is one of four items found in the Perfect Harmony menu system. Parameters are system
attributes that have corresponding values that can be monitored or, in some cases, changed by the user.
PED - PED is an acronym for pressure equipment directive, a directive of the EU relating to pressure vessels.
Pick list - A pick list is one of four items found in the Perfect Harmony menu system. Pick lists are parameters that
have a finite list of pre-defined "values" from which to choose, rather than a value range used by parameters.
PID - PID is an acronym for proportional + integral + derivative, a control scheme used to control modulating
equipment in such a way that the control output is based on (1) a proportional amount of the error between the desired
setpoint and the actual feedback value, (2) the summation of this error over time, and (3) the change in error over
time. Output contributions from each of these three components are combined to create a single output response. The
amount of contribution from each component is programmable through gain parameters. By optimizing these gain
parameters, the operator can "tune" the PID control loop for maximum efficiency, minimal overshoot, quick response
time, and minimal cycling.
Qualified user - A qualified user is a properly trained individual who is familiar with the construction and operation
of the equipment and the hazards involved.
Quick menu - Quick menu is a feature of the menu system that allows the operator to directly access any of the
menus or parameters, rather than scrolling through menus to the appropriate item. This feature uses the [Shift] button
in conjunction with the right arrow. The user is prompted to enter the four digit ID number associated with the desired
menu or parameter.
RAM - RAM is an acronym for Random Access Memory, a temporary storage area for drive information. The
information in RAM is lost when power is no longer supplied to it. Therefore, it is referred to as volatile memory.
Regeneration - Regeneration is the characteristic of an AC motor to act as a generator when the rotor's mechanical
frequency is greater than the applied electrical frequency.
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A1A19000405A: Version 1.3
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