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Table 26 - Acronyms/Terms
(Continued)
Acronym / Term
Definition
EEPROM
Electrical Erasable Programmable Read Only Memory: A type of non-volatile memory used in computers and other electronic
devices to store small amounts of data that must be saved when power is removed. It has a limited number of times it can be
reprogrammed and an unlimited number of reads.
EMC
ElectroMagnetic Compatibility Refers to the use of components in electronic systems that do not electrically interfere with each
other
Citation: http://encyclopedia2.thefreedictionary.com/EMC.
EMF
Electromotive Force; the principle of electromagnetic induction states that a time-dependent magnetic field produces a
circulating electric field.
An EMF is induced in a coil or conductor whenever there is change in the flux linkages. Depending on the way in which the
changes are brought about, there are two types: When the conductor is moved in a stationary magnetic field to procure a change
in the flux linkage, the EMF is
statically induced
. The electromotive force generated by motion is often referred to as
motional
emf
. When the change in flux linkage arises from a change in the magnetic field around the stationary conductor, the EMF is
dynamically induced
. The electromotive force generated by a time-varying magnetic field is often referred to as
Transformer EMF
.
EMI Filter
A circuit or device that provides electromagnetic noise suppression for an electronic device.
Event Log
A record of events occurring during the Compressor’s life cycle, indicating when events and faults occur and in what order. The
event log is held in the BMCC.
EXV
Electronic Expansion Valve. Pressure-independent refrigerant metering device driven by electrical input.
Fault
An intolerable or unsafe condition that will result in equipment failure. Faults will cause the compressor controller to reduce shaft
speed and shut down the system within 10 seconds requiring a manual or auto reset from the chiller controller.
Feed Through
An insulated conductor connecting two circuits on opposite sides of a barrier such as a Compressor housing or PCB.
FLA
Full Load Ampere.
Genlanolin
A type of grease. Genlanolin is applied to certain parts of the compressor to prevent moisture accumulation.
Harmonics
Harmonics are multiples of the fundamental frequency distortions found in electrical power.
Id
The part of the motor current generating torque.
IGBT
Insulated Gate Bipolar Transistor. See Inverter.
Impeller
Rotating part of a centrifugal compressor that increases the pressure of refrigerant vapor from the evaporator pressure to the
condenser pressure.
Inverter
Converts the DC bus voltage into an adjustable frequency, three-phase simulated AC voltage.
I/O Board
Input/Output Board facilitating a connection between the Compressor controller and/or PC and the Compressor. It allows the
user to control the Compressor and allows the Compressor to return status and sensor information to the user.
Iq
The part of the motor current magnetizing field.
LBV
Load Balance Valve. A modulating valve that can be installed to bypass discharge gas to the inlet of the evaporator to provide gas
flow at certain conditions such as startup, surge, and further unloading of the Compressor.
LED
Light-Emitting Diode
Levitation
The elevation or suspension of the Compressor shaft in the magnetic field created by the magnetic bearings.
Line Reactor
A line reactor is a special form of inductor that is typically used between the line and the load to smooth current inrush, reduce
harmonics and noise, and buffer the systems connected to it. Specifically it is an inductor that adds inductive impedance to a
circuit. Citation: http://www.control-transformer.com/transformer-terms-faq.asp?id=50&action=view&msgid=27.
Mid Bus
A connection between the capacitors allowing them to be connected in series and in parallel simultaneously. Two capacitors in a
series make up the DC- and two in a series make up the DC+, and those two sets of two are connected in parallel.
Modbus
www.modbus.org, Modbus is a serial communications protocol published by Modicon in 1979 for use with its programmable
logic controllers (PLCs). It has become a de facto standard communications protocol in industry, and is a commonly available
means of connecting industrial electronic devices.
Motor Back EMF
Back electromotive force is a voltage that occurs in electric motors where there is relative motion between the armature of the
motor and the external magnetic field. It is used to evaluate the strength of the permanent magnets of the shaft.
MS1, MS2
MS1 = Milestone1
MS2 = Milestone 2
specific HW/SW design series from DTC.
NIST
National Institute of Standards and Technology,
NTC
Negative Temperature Coefficient. Refers to a thermistor characteristic. Decrease in temperature equating to an increase in
resistance of the sensor.
Appendix A Acronyms/Terms
Summary of Contents for Turbocor TG230
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