3 Installation
3.3 Mount ing
76 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
Figure 41:Air circulation in frame size FS8
There must be enough clearance above and in front of the control panel in
order to ensure that there will be adequate cooling and space for any
required maintenance work. The required volume of cooling air [1] and the
required cooling air temperature must ensure that the variable frequency
drive’s maximum permissible ambient temperature will not be exceeded.
It must be possible for the hot exhaust air [2] to be channeled away
unobstructed. Residual heat may cause the variable frequency drive’s
maximum permissible ambient temperature to be exceeded.
The heat dissipation of the variable frequency drive and of the accessories in
the power branch (mains choke, motor choke, sine filter) will vary
significantly depending on the load, the output frequency, and the carrier
frequency being used.
The following formula provides a good reference value for estimating heat
dissipation at target conditions, and can be used to size cooling and
ventilation equipment for electrical rooms:
P
Dissipated
[kW] = P
Motor
[kW] x 0.025
￫
Section 6.2, „Specific rated operational data“, page147 lists
the variable frequency drives’ heat dissipation at the rated
operational current.
2
1
V = 13.75 m
3
/min
V = 485.58 cfm
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