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Term
Definition
ADC
Analog Digital Converter
AFT
Ascending Fault Triggering
ANSI
American National Standards Institute
AVC
Automatic Vibration Control; a part of the compressor magnetic bearing control system.
AWG
American Wire Gauge
Choke
Definitive points on the compressor map where the mass flow rate is at maximum for
the compressor speed and lift conditions.
CIM
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 Input/Output (IO) board.
Configuration
A DTC predetermined set of parameters necessary to configure a compressor for a
general or particular customer. It is also known as the parameter revision.
DC-DC Converter
DC-DC converter supplies and electrically isolates high and low DC voltages that are
required by the control circuits.
DTC
Danfoss Turbocor Compressors
Fault
An intolerable or unsafe condition that can result in equipment failure. Faults will cause
the compressor controller to reduce shaft speed and shut down the system. A fault
requires a manual or auto reset from the chiller controller.
IFV
IntraFlow
TM
valve directs a small fraction of the flow from the volute exit to the inlet of
the first stage diffuser through a series of nozzles. This injection of flow into the first stage
diffuser provides aerodynamic incidence control pushing the surge line and resulting in a
much larger stable operating range.
Impeller
Rotating part of a centrifugal compressor that increases the pressure of refrigerant vapor
from the evaporator pressure to the condenser pressure.
IP Protection
International Protection Marking (IP) code classifies and rates the degree of protection
provided against the intrusion (including body parts such as hands and fingers), dust,
accidental contact, and water by mechanical casings and electrical enclosures. It is
published by the International Electrotechnical Commission (IEC).
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.
OEM
Original Equipment Manufacturer. An OEM manufactures products or components that
are purchased by another company and retailed under that purchasing company’s
brand name.
PCB
Printed Circuit Board
PLC
Programmable Logic Controller
Definitions
Table 1
Definitions
Introduction