WEG CFW-11 Series User Manual page 11

General Information
DC Link: Inverter intermediate circuit; DC voltage obtained from the rectification of the AC input voltage or
from an external power supply. It feeds the inverter output IGBT bridge.
U, V and W Arms: Set of two IGBTs forming the inverter output phases U, V and W.
IGBT: "Insulated Gate Bipolar Transistor"; It is the output inverter bridge basic component, working as an
electronic switch either in the saturated (closed switch) or in the cut off mode (open switch).
PTC: It is a resistor, whose resistance value in ohms increases proportionally to the temperature increase, being
used as temperature sensor in motors.
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NTC: It is a resistor, whose resistance value in ohms decreases proportionally to the temperature increase, being
used as temperature sensor in power modules.
HMI: "Human-Machine Interface"; It is the device that allows the control of the motor, the visualization and the
modification of the inverter parameters. The CFW-11 HMI presents keys for commanding the motor, navigation
keys and a graphic LCD display.
Flash memory: It is the nonvolatile memory that can be electrically written and erased.
RAM memory: Random Access Memory (volatile).
USB: "Universal Serial Bus"; It is a serial bus standard that allows devices to be connected using the"Plug and
Play" concept.
PE: Protective Ground.
RFI filter: "Radio Frequency Interference filter". A filter that avoids interference in the radiofrequency range.
PWM: "Pulse Width Modulation". A pulsed voltage that feeds the motor.
Switching Frequency: It is the inverter bridge IGBTs commutation frequency, normally specified in kHz.
General enable: When activated, it accelerates the motor via acceleration ramp. When deactivated, this
function immediately blocks the PWM pulses. The general enable function can be controlled through a digital
input programmed for this function or via serial communication.
Run/Stop: Inverter function that when activated (Run) accelerates the motor with the acceleration ramp
until reaching the speed reference, and when deactivated (Stop) decelerates the motor with the deceleration
ramp down to stop. It can be commanded through a digital input programmed for that function or via serial
communication. The HMI keys
Heatsink: It is a metal part designed for dissipating the heat generated by the power semiconductors.
PLC: Programmable Logic Controller.
Amp, A: Ampères.
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(Run) and (Stop) work in a similar manner.