2
2-2 | CFW-11M RB
General Instructions
Current Imbalance (%):
Imbalance of power unit X - phase Y =
I
YX
- I
YAVG
x 100
I
YAVG
I
YAVG
= I
Y1
+ I
Y2
+ ... + I
YN
N
Where:
N = number of power units.
I
YN
= phase current Y (U, V or W) of the N power unit (P0815 to P0829).
I
YAVG
= average current of phase Y.
Pre-charge Circuit:
charges the DC bus capacitors with limited current, which avoids higher peak currents
at the converter power-up.
DC Bus:
converter intermediate circuit; DC voltage obtained from the AC input voltage rectification or
from an external power supply; feeds the output IGBTs converter bridge.
Power modules U, V, and W:
set of two IGBTs of the regenerative converter input phases R, S, and T.
IGBT:
Insulated Gate Bipolar Transistor; basic component of the power modules U, V and W. The IGBT
works as an electronic switch in the saturated (closed switch) and cut-off (open switch) modes.
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 a device that allows the visualization and modification of the converter
parameters. The CFW-11 HMI presents keys for the regenerative converter control, navigation keys and a
graphic LCD display.
FLASH Memory:
non-volatile memory that can be electronically written and erased.
RAM Memory:
Random Access Memory (volatile).
USB:
Universal Serial Bus; is a serial bus standard that allows devices to be connected using the ”Plug
and Play” concept.
PE:
Protective Earth.
RFI Filter:
Radio-Frequency Interference Filter for interference reduction in the Radio-Frequency range.
PWM:
Pulse Width Modulation; pulsed voltage at the input of the regenerative converter.
Switching Frequency:
frequency of the IGBTs switching, normally expressed in kHz.
General Enable:
when activated, the converter controls the voltage at the DC bus. When deactivated,
this function immediately blocks the PWM pulses. The General Enable function may be controlled through
a digital input set to this function.
Heatsink:
metal device designed to dissipate the heat generated by the power semiconductors.
Содержание CFW-11M RB
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