5.4. Cooling
The heat sources inside the equipment correspond with the inverter bridge (IGBTs), rectifier bridge, the
input filter and the output dV/dt filter. SD700 series present an overall efficiency higher than 98% at rated
power, so the heat dissipation approximately corresponds to 2% of the input power.
The cooling system of the drive depends on the degree of protection, the frame type and the frame size.
In general terms, the drive is designed with three independent cooling areas.
Figure 5.5 Cooling airflow for SD700. Frames 4 to 11(Protection Grade IP54).
1
st
Area - Electronics:
IP20 cabinets are equipped with fans on the top of the cabinet that evacuates the internal heat generated
in the area.
IP54 cabinets have a totally sealed electronics. The internal heat generated is evacuated through the
metallic doors by an internal forced convection system (See fig. 5.5).
2
nd
Area – Rectifier bridge, Inverter bridge and DC bus cooling area:
The drive integrates axial fans that intake the air from the bottom part of the drive and evacuates it through
the middle top outlet gratings. The fans propel the air through the heat sink evacuating the heat generated
by the main components.
3
rd
Area – Filters:
The inlet gratings are located at both sides of the drive; additionally the drive is equipped with exhaust fans
on the top part.
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