General Information
2-2 | CFW-11M G2
2
Where:
N = number of the power units.
I
YN
= current of phase Y (U, V or W) of the power unit N (P0815 to P0829).
I
YAVG
= average current of phase Y.
Rectifier: input circuit of the inverters which converts the AC input voltage into DC. Formed by thyristors or power
diodes.
Pre-Charge Circuit: it charges the DC link capacitors with a limited current, thus avoiding higher current peaks
when powering the inverter.
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 IGBTs bridge.
DC+: Positive terminal of the DC Link.
DC-: Negative terminal of the DC Link.
U, V, W Arms: set of two IGBTs forming the inverter output phases U, V, and W.
IGBT: insulated Gate Bipolar Transistor, basic component of the output inverters. They work as an electronic
switch in the saturated (closed switch) and cut-off (open switch) modes.
Braking IGBT: It works as a switch to turn on the braking resistors. It is controlled by the DC link level.
PTC: resistor whose resistance value in ohms increases proportionally to the temperature; used as temperature
sensor on motors.
NTC: resistor which resistance value in ohms decreases proportionally to the temperature increase; used as a
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; it's also known as keypad. The CFW-11M G2 HMI presents keys for
commanding the motor, navigation keys and a graphic LCD display.
FLASH Memory: nonvolatile memory that can be electrically written and erased.
RAM memory: random access memory.
USB: Universal Serial Bus; serial communication protocol conceived to work according to the plug-and-play
concept.
PE: Protective earth.
RFI Filter: radio Frequency Interference Filter; filter to reduce interference in the radio frequency band.
PWM: Pulse Width Modulation; a pulsed voltage that feeds the motor.
Switching Frequency: switching frequency of the IGBTs of the inverter bridge, normally expressed in kHz. Also
known as carrier frequency.
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.
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