Nidec Leroy-Somer Powerdrive MD Smart, Руководство по интеграции

Страница: 25 / 184

25
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMA
TION
1.4 - Cooling methods
Powerdrive MD Smart components generate thermal losses during operation. If these are not evacuated, they lead to temperature
rises that may cause the product to trip or components to age prematurely.
Two types of losses will be distinguished:
• Power component losses (rectifier and inverter semiconductors)
These losses represent about 80% of the total losses of the variable speed drive that are dissipated by radiators. In order
to reduce the losses to be dissipated in the electrical enclosure, the Powerdrive MD Smart has been developed so that its
power components’ radiators are located in an exhaust channel (optional accessory). Two types of radiator cooling have been
developed to meet the constraints of the installation and the environment: air cooling and liquid cooling.
• Internal losses
These losses correspond to the total losses generated by the components located inside the enclosure, i.e. the losses of the
variable speed drive components (except the power components) but also those of the components needed for the installation
(transformer, options, power supplies, relay, etc.). These losses should be evacuated using traditional enclosure cooling
methods depending on the temperature and environmental conditions imposed by the components used.
1.4.1 - Air cooling
1.4.1.1 - Ventilated power components
Air cooling is forced convection on the Powerdrive MD Smart. It is carried out by means of fans mounted on each power module.
Losses are directly discharged through an air channel mounted on the radiators of the power modules. This air channel is provided
as an option.
• Ventilated rectifiers or inverters: AF version
Ventilations Ventilation
Example: an MD3INVAF inverter Example: an MD3RECxAF rectifier MD3TUNyyTx
Note: The MD3TUNyyTx fan tunnels provide a good cooling of the components of the Powerdrive MD Smart (inverter and rectifier).
There are different ventilation tunnels depending on the size of the power module to be cooled (x=1,2,3), and their composition
(yy=R(regen), 6P(6 pulse)). See §3.4.
Ventilation tunnel
accessory