Cooling Measures - Eaton PowerXL DB1 Installation Manual

3.3.2 Cooling measures

In order for variable frequency drive DB1 to operate reliably, sufficient cooling
is crucial. An essential aspect of efficient cooling is its thermal resistance,
including optimal thermal transfer between the cooling surface of the DB1
variable frequency drive and the cooling system (e.g. heatsink, mounting
plate, or machine housing). A heating plate is required for this purpose, and
the correct torque (2 Nm) must also be used for the fixing screws (3 x M4x20).
2
Figure 14: Cooling measures
The permitted temperature on the variable frequency drive cooling surface
depends on the switching frequency set with P-17. On delivery of the device,
this is 8 Hz.
Table 5: Temperature on the cooling surface
Switching Permitted temperature T
frequency the cooling surface of
variable frequency drive DB1
4 kHz 95 °C
8 kHz 90 °C
12 kHz 85 °C
16 kHz 80 °C
24 kHz 75 °C
32 kHz 70 °C
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com
3
2 Nm (17.7 lb-in")
3 x M4 x 20
1
on
CP
3 Installation
3.3 Assembly
43