Definitions - Danfoss VTT Series Applications And Installation Manual

Definitions

Table 1
Definitions
Introduction
Term
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
Definitive points on the compressor map where the mass flow rate is at maximum for
Choke
the compressor speed and lift conditions.
Compressor Interface Module; the part of the compressor electronics where the user
CIM connects all field connection wiring such as RS-485, EXV and analog / digital wiring.
Also known as the Input/Output (IO) board.
A DTC predetermined set of parameters necessary to configure a compressor for a
Configuration
general or particular customer. It is also known as the parameter revision.
DC-DC converter supplies and electrically isolates high and low DC voltages that are
DC-DC Converter
required by the control circuits.
DTC Danfoss Turbocor Compressors
An intolerable or unsafe condition that can result in equipment failure. Faults will cause
Fault the compressor controller to reduce shaft speed and shut down the system. A fault
requires a manual or auto reset from the chiller controller.
IntraFlow
the first stage diffuser through a series of nozzles. This injection of flow into the first stage
IFV
diffuser provides aerodynamic incidence control pushing the surge line and resulting in a
much larger stable operating range.
Rotating part of a centrifugal compressor that increases the pressure of refrigerant vapor
Impeller
from the evaporator pressure to the condenser pressure.
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,
IP Protection
accidental contact, and water by mechanical casings and electrical enclosures. It is
published by the International Electrotechnical Commission (IEC).
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
Modbus
standard communications protocol in industry, and is a commonly available means of
connecting industrial electronic devices.
Original Equipment Manufacturer. An OEM manufactures products or components that
OEM are purchased by another company and retailed under that purchasing company's
brand name.
PCB Printed Circuit Board
PLC Programmable Logic Controller
Definition
valve directs a small fraction of the flow from the volute exit to the inlet of
TM
M-AI-VT-001-EN Rev.C.1
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