When making the calculation, remember to take account of all power dissipated inside the cubicle, and not simply that generated by the VFD. The following guide covers the basic calculations necessary to ensure that heat generated by a VFD can be satisfactorily transferred to the air surrounding the cubicle. The design of the enclosure in which the VFD is housed is therefore of critical importance. The single most significant reason for the premature failure of a VFD controller is operation in excessive ambient temperature. The reliable trouble-free operation of all industrial equipment is dependent upon operation in an environment for which that product was designed. This normally requires that the variable frequency drive needs to be mounted in a floor standing enclosure or wall mounted panel, to increase the degree of protection. Most VFDs are supplied with a protection rating of IP20 (Finger proof).
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