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Appendix A Acronyms/Terms
The following is a glossary of product-specific
terminology.
Table 26 - Acronyms/Terms
Acronym / Term Definition
ADC Analog Digital Converter.
AFT Ascending Fault Triggering; see Section 4.2.1 (Compressor Fault Troubleshooting).
Alarms
Alarms indicate a condition at the limit of the normal operating envelope. Compressor alarms will still allow the Compressor to
run, but speed is reduced to bring the alarm condition under the alarm limit.
ASHRAE
American Society of Heating Refrigeration and Air-Conditioning Engineers
(www.ashrae.org).
AVC Automatic Vibration Control; a part of the compressor magnetic bearing control system.
AWG American Wire Gauge.
Backplane A PCB for the purpose of power and control signal transmission. Many other components connect to this board.
Balance Piston
Component within the Compressor that provides primary counter to impeller thrust. Impeller thrust is trimmed by the axial
bearing.
BMC Bearing and Motor Control section of software held in the BMCC.
BMCC
Bearing Motor Compressor Controller. The BMCC is the central processor board of the Compressor. Based on its sensor inputs, it
controls the bearing and motor system and maintains Compressor control within the operating limits.
Boolean A value of either 0 (FALSE/NO) or 1 (TRUE/YES).
Cavity Sensor
NTC temperature sensor located behind the Backplane for the purpose of sensing motor-cooling vapor temperature. Provides
overheat protection to motor windings.
CC Compressor Controller; section of software held in BMCC.
CE
CE marking ensures the free movement within the European market of products that conform to the requirements of EU
legislation (e.g., safety, health and environmental protection and is a key indicator of a product’s compliance with legislation. The
CE marking is affixed by manufacturers to their products. By placing CE marking on a product, manufacturers declare on their sole
responsibility that the products comply with all the legal requirements in force in Europe.
Citation: European Commission; Directorate-General for Enterprise and Industry; ww.ec.europa.eu/CEmarking.
Choke Definitive point on Compressor map where mass flow rate is at maximum for Compressor speed and lift conditions.
CIM / I/O-board
Compressor Interface Module; the part of the compressor electronics where the user connects all field connection wiring such as
RS-485, EXV, and analog / digital wiring. Also known as the I/O board.
Compression
Ratio
The absolute discharge pressure divided by the absolute suction pressure.
Configuration
A DTC predetermined set of registers necessary to configure a compressor for a general or particular customer. It is also known as
the Part Number (PN) or parameter revision.
CPU
Central Processing Unit; can be a dedicated type like a Digital Signal Processor (DSP) or a more general type like a Micro Controller
Unit (MCU).
DSP
Digital Signal Processor; a specific Central Processing Unit (CPU) dedicated for special applications like video handling or electric
motor control.
D-Sub
A type of connector/plug (male and female) for control wiring. The RS-232 and large connectors on either side of the I/O cable are
both types of D-Sub connectors.
DC Bus High DC voltage simultaneously connected to multiple compressor components including the capacitors.
DC Capacitor
Assembly
An assembly of four DC capacitors, four bleed resistors, and bus bars.
DC-DC Converter DC-DC converters supply and electrically isolate the high and low DC voltages that are required by the control circuits.
DFT Descending Fault Triggering; see Section 4.2.1 (Compressor Fault Troubleshooting).
Dielectric A dielectric is a nonconducting substance.
Diffuser
Part of a centrifugal compressor in the fluid module that transforms the high-velocity, low-pressure gas exiting the impeller into
high-pressure, low-velocity gas discharged into the condenser.
Down-Trip Voltage A voltage threshold where, if the incoming AC voltage drops below it, the Soft Start will shut down.
DTC Danfoss Turbocor Compressors Inc.
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