Nidec Leroy-Somer Powerdrive MD Smart, Руководство по интеграции

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GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMA
TION
MD3INV chassis are available in 3 sizes depending on the desired power level.
MD3INV
Size 1 Size 2 Size 3
Up to 200 kW
single module chassis
250 kW to 315 kW
tri-module chassis
400 kW to 500 kW
tri-module chassis
Beyond 500 kW, the MD3INV chassis can be combined in parallel up to 5 per output, allowing a power output of 2.5 MW. In this
case, it is necessary to add a parallelisation module. For more details, refer to §1.2.5 .
1.2.3 - Preload module
The MD3PRG preload module allows the DC bus to be powered up gradually from an active rectifier
system or from a DC bus system. It allows, through controlled thyristors, the voltage of the DC BUS
to be increased gradually.
From a certain VDC voltage threshold, information is sent to the control module which also checks
that the network is in phase. When all these conditions are met, the active rectifier can be unlocked
and connected to the power circuit, the preload module can be isolated.
1.2.4 - Inverters
MD3INV inverters convert the DC Bus voltage provided by the rectifier
to generate a three-phase source with variable voltage and frequency
to power the motor.
This inverter has an IGBT structure and works according to the Pulse
Width Modulation (PWM) method. It must be associated with a control
module and generate AC voltage from the DC bus voltage (DC/AC
converter).
Note
MD3INV modules can also be used as active rectifiers. For more
information, see §1.2.2.2
Inverter
MD3INV