Nidec Leroy-Somer Powerdrive MD Smart, Руководство по интеграции

Страница: 17 / 184

17
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMA
TION
1.2.5 - Parallelisation module
Above 500 kW, the rectifier and inverter chassis shall be installed in parallel to achieve the required
power levels (up to 2.5 MW). In this configuration, the first inverter (or active rectifier) chassis must be
associated with a control module and each additional chassis must be associated with an MD3PRL
parallelisation module.
1.2.6 - The braking module
In the case of driving loads with high inertia or load decelerations that are too fast, the energy produced
cannot be evacuated, DC Bus overvoltage phenomena may occur. To avoid any risk of unwanted
tripping, this energy must be dissipated in resistors via a braking module.
The MD3TF braking module is compatible with 6-PULSE, 12-PULSE, 18-PULSE and 24-PULSE
power architectures.
Note
The braking module can also be combined with an Active Front End (AFE) architecture, with an
active rectifier, although the system is regenerative. In fact, for very specific applications such as
hydroelectricity, it is possible to consider a cut in the supply network and thus the impossibility of
reinjecting energy on the network, when tripping. During the shutdown phase, this energy must be
dissipated through a braking transistor in a braking resistor. This option can also be integrated into test
bench-type applications on synchronous machines.
Examples of applications where the braking module is most often used: Ventilation, Press, Lifting, 2 x
Cn Braking (Cn = Motor rated torque), Hydroelectricity, Synchronous machine test bench.
Several braking modules can be combined to increase the braking capacity. They must not
be mounted in parallel on a single resistor: use as many resistors as braking modules.